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corn earworm
Corn Treasure Valley - Idaho
Posted on: July 27, 2006 by Jerry Neufeld
The second generation of corn earworm moths will begin laying eggs in corn silking between 1450 and 1650 growing degree days (GDD). GDD accumulations for Caldwell and Parma are 1391 and 1461 respectively. We are accumulating about 25 GDD per day. If you have corn silking during this time period you will want to continue scouting for earworm eggs.
Iris Yellow Spot Virus
Onion Treasure Valley - Idaho
Posted on: July 21, 2006 by Jerry Neufeld
Lynn Jensen from the Oregon State University, Malheur County Cooperative Extension Office is reporting that Iris Yellow Spot Virus has been identified in onion fields in the Ontario, Oregon area. There are currently no known fungicide treatment options for this virus. The virus is transmitted by onion thrips. Growers should keep their fields as stress free as possible by keeping thrips populations in check and by maintaining good irrigation practices.
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 21, 2006 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer moths will begin laying eggs in fresh corn silk at approximately 1300 GDD. Egg hatch and larvae attack will begin about 73 GDD later.
According to the Oregon State University Growing Degree Day (GDD) model for Corn Earworm (http://pnwpest.org), we are currently at 1221 GDD in the Caldwell area and 1276 GDD in the Parma area. We are accumulating approximately 24 GDD per day. Those fields silking at 1300 GDD are most vulnerable to attack from corn earworm larvae. We should reach 1300 GDD in the next few days.
The following information was taken from CIS 366 regarding corn earworm.
Corn can be “scouted” for corn earworm eggs to predict possible infestation levels. Examine 10 silk masses (about 2-day old) on each edge of a field but only in those fields which are beginning to silk or are silking. Examining a field in late silk for the first time is worthless; most of the eggs, if any were present, are already hatched, and the damage cannot be prevented.
When the egg counts average 1 per 2 masses, about 100% ear infestation will occur in the field and other fields of like maturity in the vicinity. With 1 egg per 2 silk masses, about 1 inch of each ear tip will be damaged; 1 egg per silk mass will result in about 2 inches of the ear tip damage, etc. When the days and nights are warmer than usual, the damage may double because the earworm will develop faster than the corn.
Fields should be scouted about every 2 to 4 days, depending on temperatures. Once economic egg levels are reached, determined on the basis of damage expected, further scouting is unnecessary. All fields which silk after that time in that vicinity will be subject to damage.
No chemical control will control worms in the ears, so sprays must be timed to control the larvae on the silk before the worms enter the ears. Make the first application when the plants are 50 percent silk, and repeat in 5 to 7 days or as necessary.
corn earworm
All Crops Treasure Valley - Idaho
Posted on: July 21, 2006 by Jerry Neufeld
According to the Oregon State University Growing Degree Day (GDD) model for Corn Earworm (http://pnwpest.org), we are currently at approximately 1221 GDD in the Caldwell area and 1276 GDD in the Parma area. We are accumulating approximately 24 GDD per day. We should reach 1300 GDD in the next few days.
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer moths will begin laying eggs in fresh corn silk at approximately 1300 GDD. Egg hatch and larvae attack will begin about 73 GDD later. Those fields silking at 1300 GDD are most vulnerable to attack.
The following information was taken from CIS 366 regarding corn earworm.
Corn can be “scouted” for corn earworm eggs to predict possible infestation levels. Examine 10 silk masses (about 2-day old) on each edge of a field but only in those fields which are beginning to silk or are silking. Examining a field in late silk for the first time is worthless; most of the eggs, if any were present, are already hatched, and the damage cannot be prevented.
When the egg counts average 1 per 2 masses, about 100% ear infestation will occur in the field and other fields of like maturity in the vicinity. With 1 egg per 2 silk masses, about 1 inch of each ear tip will be damaged; 1 egg per silk mass will result in about 2 inches of the ear tip damage, etc. When the days and nights are warmer than usual, the damage may double because the earworm will develop faster than the corn.
Fields should be scouted about every 2 to 4 days, depending on temperatures. Once economic egg levels are reached, determined on the basis of damage expected, further scouting is unnecessary. All fields which silk after that time in that vicinity will be subject to damage.
No chemical control will control worms in the ears, so sprays must be timed to control the larvae on the silk before the worms enter the ears. Make the first application when the plants are 50 percent silk, and repeat in 5 to 7 days or as necessary.
powdery mildew in sugarbeets
Sugarbeets All Locations
Posted on: July 21, 2006 by Jerry Neufeld
Dr. John Gallian, Extension Plant Pathologist and Sugarbeet Specialist at the University of Idaho, Twin Falls R&E Center recently posted this message to the UIsugarbeet-INFO digest regarding powdery mildew in sugarbeets.
Bayer CropScience has a 2(ee) label for Gem Fungicide that allows for the application of Gem 25WG at the reduced rate of 5 oz/acre in combination with a minimum of 5 lb/acre of micronized wettable or dispersible sulfur. Although the 2(ee) label does not specify where the reduced rate should be used, Bayer's sales recommendation specifically states "In the Magic Valley or where powdery mildew pressure is usually less severe and residual control requirements are less, Gem may be used at a reduced rate of 5 oz/acre tank mixed with 5 lbs/acre micronized or dispersible sulfur per our ID/OR 2(ee)=85.".
I understand that this reduced rate is being recommended and applied in the Treasure Valley. I STRONGLY recommend against applying the reduced rate in the Treasure Valley where disease pressure is high! Gem, Headline, and Topsin are all at risk for resistance in powdery mildew to develop. Using less than the full rate of an "at risk" fungicide greatly increases the probability of selecting a resistant pathogen population.
In the Treasure Valley, I recommend that if Gem is to be used, only the full 7 oz/acre rate, tank mixed with a minimum of 5 lbs/acre sulfur, be applied at the earliest opportunity. At-risk fungicides should be used early in the epidemic when the pathogen population is low - just before or immediately after powdery mildew is first detected. This treatment timing is appropriate with all registered fungicides in all locations. All at risk fungicides should be tank mixed with a minimum of 5 lbs/acre of sulfur for resistance management. We should do everything we can to preserve the efficacy of all our fungicides by following best management practices for avoiding resistance from developing.
For further information, visit our website at:http://www.uidaho.edu/sugarbeet/Managingfungresist.htm
Dr. John J. Gallian
Extension Plant Pathologist and Sugarbeet Specialist
University of Idaho, Twin Falls R&E Center
P.O. Box 1827
Twin Falls, ID 83303-1827
(208)736-3600 Fax: (208)736-0843
Web Page: www.uidaho.edu/sugarbeet/
PCN Update for July 18
Potato All Locations
Posted on: July 19, 2006 by Jeff Miller
Potato Cyst Nematode (PCN)
Stakeholder Update
(7/18/06)
SITUATION SUMMARY
On April 19, 2006 officials of USDA’s Animal and Plant Health Inspection Service (APHIS) and the Idaho State Department of Agriculture (ISDA) announced the detection of potato cyst nematode (PCN), Globodera pallida, a major pest of potato crops. This is was the first detection of the pest in the United States. The nematode cysts were detected during a routine survey of tare soil at an ISDA grader facility in eastern Idaho. In that survey, more than 3,500 samples were analyzed, and only one was positive.
On June 13, 2006, soil samples collected from a 45-acre field in northern Bingham County tested positive for PCN. Based on these survey results, and the more than 3,000 additional samples taken since the April detection, the PCN infestation appears to be isolated, but additional surveillance will continue.
Updates and related information:
A soil sample from a field located near the 45-acre field in northern Bingham County has tested positive for PCN. This is the second field to have a confirmed PCN finding. The positive finding is not surprising because of the field’s proximity to the already-identified positive field. ISDA and APHIS officials continue to believe the PCN infestation in eastern Idaho is isolated.
ISDA and APHIS continue to search for the PCN’s original source. A trace of seed sources has been completed, but did not yield any helpful information. Investigators continue to examine other possibilities, including farming practices, tillage equipment, irrigation sources and wildlife patterns.
Investigators continue to test fields that are located near the original 45-acre field or have equipment, tenants or personnel in common. Soil samples taken from those fields are being expedited to the University of Idaho nematology lab in Parma.
Two fields are under federal restrictions (no potatoes to be planted, no soil to leave and equipment to be cleaned).
Officials from the Idaho State Department of Agriculture and U.S. Department of Agriculture continue to work with trade partners on this issue. Both agencies are in the process of answering Japan’s questions about the PCN situation in Idaho. Japan has banned the import of all potatoes from the United States.
powdery mildew in sugarbeets
Sugarbeets All Locations
Posted on: July 10, 2006 by Jerry Neufeld
Powdery mildew has been positively identified by Amalgamated Sugar Company Representatives in sugarbeet fields in the western Treasure Valley (Homedale, ID; Vale and Adrian, OR areas). While there have been no reports of black bean aphids, loopers or armyworms, they typically show up about this time of year. As you scout your fields for powdery mildew, you may also want to be on the lookout for these pests. Contact your field representative from the Amalgamated Sugar Company if you have questions.
Malheur Field Day
Announcements All Locations
Posted on: July 6, 2006 by Clint Shock
YOU ARE INVITED TO THE
Malheur Experiment Station Annual Field Day
July 12, 2006 from 8:30 AM - 1:00 PM
The program will cover onions (thrips, IYSV, and more!) potatoes, small grains (including waxy barley), teff, wildflower seed production, poplar trees, soybeans, and noxious weeds. A complimentary lunch will be served. During lunch there will be a presentation by Sandy Halstead, Agricultural Specialist of the EPA. EPA is considering restrictions on the ways VAPAM can be used. VAPAM is an important product in growers' attempts to control yellow nutsedge. For more details on the program see http://www.cropinfo.net/events.htm
Please reserve lunch by calling Janet Jones
(541) 889-2174 Or emailing her at janet.jones@oregonstate.edu
Malheur Experiment Station
595 Onion Ave.
Ontario, OR 97914
Late blight forecast
Potato All Locations
Posted on: July 6, 2006 by Jeff Miller
Scattered thundershowers have made conditions ideal for late blight development. Fungicide treatment is recommended due to the favorable weather and the rapid growth of the crop in most places. Late blight was found in the Columbia Basin of Washington in late June.
Early blight forecast
Potato Eastern Idaho
Posted on: July 6, 2006 by Jeff Miller
The P-Day threshold for early blight has been reached in the three locations in eastern Idaho where weather data are being collected (Aberdeen, Fort Hall, and Rexburg). The threshold was reached on July 3 for Aberdeen and Fort Hall and July 5 for Rexburg. These predictions are based on early crop emergence dates. Potatoes should be treated for early blight at this time.
Field Day Wednesday July 12 Oregon State Univ. Malheur Exper
All Crops Treasure Valley - Oregon
Posted on: July 6, 2006 by Clint Shock
YOU ARE INVITED TO THE
Malheur Experiment Station Annual Field Day
July 12, 2006 from 8:30 AM - 1:00 PM
The program will cover onions (thrips, IYSV, and more!) potatoes, small grains (including waxy barley), teff, wildflower seed production, poplar trees, soybeans, and noxious weeds. A complimentary lunch will be served. During lunch there will be a presentation by Sandy Halstead, Agricultural Specialist of the EPA. EPA is considering restictions on the ways VAPAM can be used. VAPAM is an important product in growers' attempts to control yellow nutsedge. For more details on the program see http://www.cropinfo.net/events.htm
Please reserve lunch by calling Janet Jones
(541) 889-2174 Or emailing her at janet.jones@oregonstate.edu
Malheur Experiment Station
595 Onion Ave.
Ontario, OR 97914
UI's Parma R and E Center Field Day
Announcements Treasure Valley - Idaho
Posted on: June 27, 2006 by Jerry Neufeld
The University of Idaho's Parma Research and Extension Center will showcase its work in small grains, forages and row crops at a July 7 field day for the public.
Beginning at 9 a.m. and concluding at lunch with a sandwich meal, this year's field day will highlight ongoing studies in wheat, barley, triticale, onions, potatoes, beans and alfalfa seed. Visitors will tour trials of promising new small grains in various market classes and will hear about the effects of harvest dates on triticale and wheat forage. They will learn about fertilizer management in small grains, including fall-planted waxy spring barleys and low-phytate spring barleys.
Participants interested in potatoes will see trials of new varieties for the Treasure Valley and studies focusing on phosphorus, groundcover effects, pesticide placement and seed physiology.
Visitors will also tour research on plant spacing and available phosphorus in alfalfa seed, on seed inoculation and treatment in beans, and on neckrot incidence and control of sunscald, thrips and nutsedge in onions.
Attendance is free and lunch will be provided. The Parma Research and Extension Center is located 1 mile north of Parma on UI Road. For more information, contact Extension crop management specialist Brad Brown at (208) 722-6701, Ext. 216, or bradb@uidaho.edu.
Early blight forecast
Potato Magic Valley
Posted on: June 26, 2006 by Jeff Miller
The P-Day threshold has been reached in the Twin Falls and Rupert areas. Treatment for early blight is recommended at this time. This calculation is based on a crop emergence date of May 10-15.
PCN Update for June 23
Potato All Locations
Posted on: June 23, 2006 by Jeff Miller
Potato Cyst Nematode (PCN)
Stakeholder Update
(6/23/06)
SITUATION SUMMARY
On April 19, 2006 officials of USDA’s Animal and Plant Health Inspection Service (APHIS) and the Idaho State Department of Agriculture (ISDA) announced the detection of potato cyst nematode (PCN), Globodera pallida, a major pest of potato crops. This is was the first detection of the pest in the United States. The nematode cysts were detected during a routine survey of tare soil at an ISDA grader facility in eastern Idaho. In that survey, more than 3,500 samples were analyzed, and only one was positive.
On June 13, 2006, soil samples collected from a 45-acre field in northern Bingham County tested positive for PCN. Based on these survey results, and the more than 3,000 additional samples taken since the April detection, the PCN infestation appears to be isolated, but additional surveillance will continue.
Updates and related information:
Investigations revealed that over 80 fields operated by nearly 30 growers provided potatoes that passed through the ISDA grader facility on the day the positive tare dirt sample was collected. Fifty-six of those fields, operated by 25 growers in seven counties, were identified as high priority for sampling. The positive field was one of those fields.
Personnel from ISDA and APHIS continue to collect soil samples from potato fields and cellars in eastern Idaho. They are taking samples from fields that are associated with the positive field south of Idaho Falls as well as other fields throughout the Upper Snake River Plain. Only one field has been confirmed positive.
University of Idaho nematology lab in Parma is currently analyzing the samples, and ISDA is developing additional laboratory capacity in Twin Falls. APHIS is planning to establish laboratory capacity in Idaho Falls.
The two potato cellars which were regulated in April were released from their Emergency Action Notifications (EANs) June 19. All the samples taken at these cellars were analyzed and found to be free of PCN.
Currently, three fields and one packing shed are regulated under EANs. Under the EAN restrictions, no potatoes can be planted in the fields, no soil can leave the fields, and equipment leaving the fields must be cleaned of soil. APHIS and ISDA provide a cleaning service for the equipment when requested. Two of the fields were highly suspect based on the original tare dirt sample analyzed in April. So far, all samples from those fields have been negative for PCN. If analyses of all samples are completed and they are found to be free of PCN, those fields can be released. The third field was determined to be infested with PCN and will be subject to ongoing regulations which will be developed as the situation continues to be evaluated.
The packing shed is currently prohibited from allowing sediment in the settling pond to be dumped without burial at an approved site. Upon disposal of the sediment currently in the pond, that shed will be completely deregulated.
Questions and Answers
Question: Is it true that PCN is present in Europe and is easily managed?
Answer: PCN is present in several European countries, and it is under Official Control in the areas where it exists. Official Control programs place restrictions on growers and shippers so that spread and increase of the nematode population is minimized. PCN is a regulated quarantine pest on the world scene. Some of the management practices that are used in Europe and other locations where PCN is present include long rotations (5+ years between potato crops), use of resistant potato varieties, and chemical treatments. USDA and ISDA scientists do not believe that any of the potato varieties currently grown in Idaho are resistant to PCN.
Question: Is USDA confident of the identification of PCN in Idaho.
Answer: Yes. USDA utilized a multiple step process at the Beltsville Laboratory to confirm the identification of PCN from the original tare dirt sample and the field. Nematode cysts and juvenile nematodes were subjected to a microscopic examination which utilized shape, size, and structural characteristics to compare the specimens with known PCN. Then, Beltsville scientists performed multistage DNA analyses on the larvae to reach a final conclusion that the nematodes are Globodera pallida. They also provided genetic material to the Nematology Laboratory at University of Nebraska where the confirmation was verified through independent testing.
Question: Can soil tests conclusively identify the field from which a sample was taken.
Answer: Current soil tests can show a relationship between a sample and the field from which it was taken. Soil samples have been analyzed by USDA Natural Resources Conservation Service to determine various soil properties so that tare dirt samples can be related to soil type and other geographically described soil areas. The APHIS laboratory in Gulfport Mississippi is conducting research on soil from fields associated with the tare dirt samples, the infested field, and other fields to test new technologies that may allow more specific characterization of soil to a specific site.
Stripe Rust
Small Grains Treasure Valley - Idaho
Posted on: June 23, 2006 by Jerry Neufeld
Dr. Brad Brown, Crop Management Specialist, at the U of I Parma Research and Extension Center has found very low levels of stripe rust infection in spring barley on the Parma station. He has found rust in Colter and 1550 and somewhat less in Baronesse and 451H barley. He has also found stripe rust in spring wheat. It is low enough infection, and sufficiently late that it likely will not be of consequence for production, except possibly in the most susceptible varieties that were planted particularly late.
Early blight forecast
Potato Magic Valley
Posted on: June 21, 2006 by Jeff Miller
A total of 300 P-days has accumulated in the Twin Falls area. This is the threshold for the optimal time for the first fungicide treatment for early blight control.
The late blight forecast for the Twin Falls and Rupert areas is moderately low. However, recent thundershower activity has made conditions more favorable for late blight development. Fungicides that are applied for early blight control will provide protection against late blight.
Early and late blight forecast
Potato Treasure Valley - Idaho
Posted on: June 21, 2006 by Jeff Miller
A total of 300 P-Days have accumulated for the Parma and Glenns Ferry areas. Research has shown that fungicide treatment for early blight is most effective when initiated at 300 P-days.
Additionally, early season weather in the Parma area has been conducive for late blight development. The University of Idaho forecast indicates a moderate probability of late blight in that area.
Powdery Mildew in Sugarbeets
Sugarbeets Treasure Valley - Idaho
Posted on: June 19, 2006 by Jerry Neufeld
The Amalgamated Sugar Company Field Representatives (TASCO) are saying that now is the time to plan your treatments for powdery mildew in sugarbeets. While mildew has not yet been found in the Treasure Valley, TASCO Field Representatives say the modes of action of the mildew chemistries work best if treatments are applied before mildew is found in the field. TASCO is recommending mildew applications in the west end of the Treasure Valley by July 5, and applications in the east end of the Treasure Valley (Ada/Canyon County line) no later than July 10. Treatments should be made by these dates regardless of whether or not your fields are surface or sprinkler irrigated. THIS WEBSITE DOES NOT CONTAIN A REFERENCE PAGE FOR POWDERY MILDEW IN SUGARBEETS. CONTACT YOUR FIELD REPRESENTATIVE FROM TASCO FOR THEIR TREATMENT RECOMMENDATIONS.
PCN Update
Potato All Locations
Posted on: June 16, 2006 by Jeff Miller
Potato Cyst Nematode (PCN) Stakeholder Update (6/15/06)
SITUATION SUMMARY
On April 19, 2006 officials of USDA’s Animal and Plant Health Inspection Service (APHIS) and the Idaho State Department of Agriculture (ISDA) announced the detection of potato cyst nematode (PCN), Globodera pallida, a major pest of potato crops. This is was the first detection of the pest in the United States. The nematode cysts were detected during a routine survey of tare soil at an ISDA Grader facility in eastern Idaho. In that survey, 3500 samples were analyzed, and only one was positive.
On June 13, 2006, soil samples collected from a 45-acre field in northern Bingham County tested positive for PCN. Production in the area is for fresh market and processed potatoes, not seed potatoes. The field is not within an Idaho Seed Potato Crop Management area, where safeguards assuring quality are monitored. As part of the investigation following the April detection, more than 2,500 samples representing over 60 fields and facilities associated with shipments that went through the grading station were tested. All other samples collected as part of the investigation have tested negative for PCN. Additionally, more than 3,000 Idaho soil samples taken since last fall as part of the Cooperative Agricultural Pest Survey (CAPS) from processing and fresh pack facilities and 500 samples taken from seed potato producers have been negative for PCN. Based on these survey results, and the more 2,500 samples taken since the April detection the PCN infestation appears to be isolated, but additional surveillance will continue.
Investigators from APHIS and ISDA are continuing to conduct interviews which determine where surveys and sample collection may be useful to ensure that the spread of the nematode is limited.
Preliminary identification of the nematodes was conducted by the University of Idaho (U of I) Nematology Laboratory, and the identity was confirmed by the USDA Nematology Laboratory in Beltsville, Maryland using both morphometric and molecular sequencing technologies.
The microscopic nematodes pose no threat to human health and never actually enter the tuber. However, they can reduce the yield of potatoes through root damage. There is no evidence that the quality or yield of potatoes grown in Idaho has been affected. However, there are significant trade implications.
Trading partners have reacted in various ways to the detection of PCN.
•Japan has suspended all potato imports from the U.S.
•Canada, Korea, and Mexico suspended potato shipments from the State of Idaho.
•Taiwan, Malaysia, and Singapore have asked for information, but have taken no action to suspend potato imports from the United States.
APHIS emergency action notifications (EANS) and ISDA restrictions have been imposed on the Bingham County field and other suspect sites. These state and federal actions restrict the movement of soil, plants, plant material and farm equipment which may have been exposed to the potato cyst nematode and they are intended to prevent the introduction and dissemination of the pest. To date, these restrictions have been imposed in Bingham, Bonneville, and Jefferson counties, but they are currently limited to only five six sites. Previously restricted fresh packed product has been released to move in commerce. Idaho potatoes and potato product are moving normally in domestic commerce.
Depending on the results of ongoing surveys, restrictions may be placed on areas surrounding infested fields. Idaho potato farmers, packers and processors continue to work closely with APHIS and ISDA to ensure that spread of the nematode and need for widespread regulations can be avoided.
Updates and related information:
The APHIS/ISDA unified command in Idaho Falls will continue in operation. Soil samples continue to be collected, focusing on land that is adjacent to the field where PCN was positively identified, and on properties that have shared equipment, labor or other resources with the field.
AHPIS/ISDA continue to gather information about seed sources for the infested field. That traceback continues with the full understanding that the seed source may have nothing to do with the field infestation. It may have originated with equipment, farm personnel, wind, wildlife or other sources. Those other possibilities continue to be explored as well.
APHIS/ISDA has not released the specific location of the field in question in order to prevent the spread of the infestation. One media report incorrectly pinned the location as Blackfoot, which is in central Bingham County. The field is actually in northern Bingham County.
ISDA and APHIS continue to regulate six sites and establishments: three fields, one packing shed, and two potato cellars. Two of the fields remain regulated while soil samples are examined, but have so far not yielded any positive PCN samples. Regulations on those two fields and the shed and cellars are expected to be released soon.
Approximately 28 different farm operations sent potatoes to the grader station on the day in February that the original positive soil sample was collected. Soil samples continue to be analyzed from more than 50 fields on these farms.
During its 25-plus year history, the U. of I. Nematology Laboratory at Parma, Idaho, has processed approximately 100,000 samples all of which have been negative for PCN until the most recent detection.
More than 20 APHIS, ISDA, and U of I personnel are currently working on the cooperative control program.
POTATO CYST NEMATODE TRACED TO SINGLE IDAHO FIELD
Potato All Locations
Posted on: June 14, 2006 by Jeff Miller
POTATO CYST NEMATODE TRACED TO SINGLE IDAHO FIELD
WASHINGTON, June 13, 2006–Scientists looking for evidence of potato cyst nematode (PCN) in Idaho today confirmed the presence of the pest in one eastern Idaho field.
The cysts were discovered in soil samples collected by the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) and the Idaho State Department of Agriculture (ISDA). The soil was collected as part of the investigation into the April 19, detection of the pest, which was found in routine samples taken at a potato grading station in Idaho. The nematode does not pose any threat to human health, but can reduce the yield of potatoes and other crops. There is no sign that the quality of tubers grown in Idaho has been affected.
The soil samples that tested positive for PCN were collected from a 45-acre field located in northern Bingham County, south of Idaho Falls. Production in the area is for fresh market and processed potatoes, not seed potatoes. The field is not within an Idaho Seed Potato Crop Management area, where safeguards assuring quality are monitored. As part of the investigation, more than 2,500 samples representing numerous fields associated with the grading station were tested. All other samples collected as part of the investigation have tested negative for PCN. Additionally, more than 3,000 Idaho soil samples taken since last fall as part of the Cooperative Agricultural Pest Survey (CAPS) have been negative for PCN. Based on these survey results, the PCN infestation appears to be isolated, but additional surveillance will continue.
APHIS and ISDA are implementing a regulatory program at the positive site designed to prevent the pest’s spread to other fields. The program will restrict the movement of plants and soil, and require sanitation procedures for equipment used on the regulated field. Aggressive delimiting surveys are being conducted in areas associated with the PCN-positive field. Associated areas include those areas with geographic nearness, common usage of tillage equipment, common seed sources, common irrigation water or other means.
The potato cyst nematode, Globodera pallida, is a major pest of potato crops in cool-temperate areas. It primarily affects plants within the potato family including tomatoes, eggplants and some weeds. Potato cyst nematode infestations may be associated with patches of poor growth. Affected potato plants may exhibit yellowing, wilting or death of foliage–none of which has been observed in Idaho potato fields. If left unmanaged, nematodes can cause significant yield loss. The PCN is widely distributed in many potato-growing regions throughout the world. In North America, the nematode is also known to be present on the island of Newfoundland, Canada.
Early detection of pests minimizes agricultural production costs and enhances product quality and marketability. Crop rotation and the use of certified seed and nematicides (fumigants or granular systemic compounds) are effective and practical means of suppression.
Wayne Hoffman
Special Assistant to the Director
Idaho State Department of Agriculture
office (208) 332-8671
cell (208) 841-1305
home (208) 467-9257
email whoffman@idahoag.us
UI's Parma R and E Center Field Day
Announcements All Locations
Posted on: June 12, 2006 by Jerry Neufeld
The University of Idaho's Parma Research and Extension Center will showcase its work in small grains, forages and row crops at a July 7 field day for the public.
Beginning at 9 a.m. and concluding at lunch with a sandwich meal, this year's field day will highlight ongoing studies in wheat, barley, triticale, onions, potatoes, beans and alfalfa seed. Visitors will tour trials of promising new small grains in various market classes and will hear about the effects of harvest dates on triticale and wheat forage. They will learn about fertilizer management in small grains, including fall-planted waxy spring barleys and low-phytate spring barleys.
Participants interested in potatoes will see trials of new varieties for the Treasure Valley and studies focusing on phosphorus, groundcover effects, pesticide placement and seed physiology.
Visitors will also tour research on plant spacing and available phosphorus in alfalfa seed, on seed inoculation and treatment in beans, and on neckrot incidence and control of sunscald, thrips and nutsedge in onions.
Attendance is free and lunch will be provided. The Parma Research and Extension Center is located 1 mile north of Parma on UI Road. For more information, contact Extension crop management specialist Brad Brown at (208) 722-6701, Ext. 216, or bradb@uidaho.edu.
Stripe Rust in Wheat - Ririe, ID
Small Grains Eastern Idaho
Posted on: June 9, 2006 by Juliet Windes
A 5-acre field of Moreland hard red winter wheat in Ririe, ID, has stripe rust. This site is about 100 miles north-northeast of the last confirmed location. Please scout susceptible varieties often! The ten-day forecast predicts stormy, cooler weather that will be conducive to stripe rust spread and infection. Right now, spring wheat will be especially vulnerable. You can report new locations and varieties affected by calling Juliet Windes at 208-529-8376 or emailing jwindes@uidaho.edu. This is only to allow us to track the spread and infection of varieties and to alert growers in affected areas for the potential need to apply fungicides. For control recommendations and pictures please visit our website at http://www.ag.uidaho.edu/scseidaho/
Onion Thrips and Iris Yellow Spot Virus
Onion Treasure Valley - Idaho
Posted on: June 7, 2006 by Jerry Neufeld
Onion Thrips/Iris Yellow Spot Virus Control Seminars sponsored by the University of Idaho and Oregon State University will be held at the following locations next week.
Monday, June 12 – Ontario, Oregon, OSU Extension office
Wednesday, June 14 – Parma, Idaho, Parma Research and Extension Center classroom
Thursday, June 15 – Weiser, Idaho at the Vendome
Meetings will start at noon and last an hour. Free sack lunches will be provided.
Topics to be covered are the relationship between thrips control and development of IYSV. Additional topics include the section 18 label for Carzol, experience from 2005 research trials, application timing, resistance management, and handler safety.
All growers and distributor field personnel that plan to use this product in 2006 are encouraged to attend this meeting.
Cherry Fruit Fly
Tree Fruits Treasure Valley - Idaho
Posted on: June 6, 2006 by Steven Reddy
Ben Simko, Entomology Program Manager ISDA, reported that one of his scouts brought in a positive Western Cherry Fruit Fly on a yellow panel trap from the rural Nampa area on June 5th.
According to the insect model, June 3-4 was the recommended treatment date for Cherry Fruit Fly in Canyon County.
Stripe Rust in Wheat
Small Grains Magic Valley
Posted on: June 5, 2006 by Juliet Windes
Stripe rust has been reported now infecting the HRW Moreland in the Rupert / Paul area. Reports of low levels of stripe rust in Brundage SWW have indicated attenuated progression of the disease with higher temperatures. Continue to scout susceptible varieties, such as Deloris and Moreland, and scouting of susceptible spring wheat varieties should also be done at least twice a week.
