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Ag Talk Tuesday - the latest UI Ag Talk Report
All Crops All Locations
Regional Crop Diseases
Posted on: June 11, 2019 by Juliet Marshall
Here’s what you missed at the June 4 Ag Talk Tuesday in American Falls… and other Hot Topics (See attached PDF):
NEW CALL-IN NUMBER FOR AG TALK TUESDAY SESSIONS
Have instant access to UI ag faculty and other attendees remotely during the Ag Talk Tuesday sessions. You can simply call a phone number to join the meeting, or you can click on the Zoom link below (the needed software will automatically download when you start or join your first Zoom meeting) to ask any questions you have or to share your observations with how crops are progressing and what current issues appear to be in your region.
The next Ag Talk Tuesday will be held 8:00 AM July 2 in Rexburg at Idaho AgCredit, 1586 North 2nd East.
Call-in Number: (669) 900-6833
Meeting ID: 349427773
(Optional) Zoom link: https://uidaho.zoom.us/j/349427773
Onion Thrips update 6/8/2019
All Crops All Locations
Onion thrips
Posted on: June 10, 2019 by Stuart Reitz
Hello Everyone,
There hasn’t been a tremendous increase in thrips abundance this week as insecticide programs are ramping up. The rain and wind has also helped to slow population build up. (Thrips tend not to fly in windy conditions and rain can drown or wash them off plants). Fields were checked this week in between thunderstorms on Thursday and Friday and couple on Saturday.
Highest numbers again were in larger early season varieties and in reds. The highest numbers I saw on individual plants ranged from 50 – 90 thrips. Still, those numbers have been sporadic. Other plants within the same field had as few as 1 and nearby fields with smaller plants may have few if any thrips. The bottom line is to check as many plants as possible when scouting your fields.
I have not seen any plants infected with Iris yellow spot virus (yet). Pink root symptoms have been showing up in some red onion fields. At this point, reducing stress on plants (e.g. good irrigation practices) is the best way to limit the impact of the disease.
Adults per Plant
Growing Area 5/15 5/25 5/31 6/8
Oregon Slope/Weiser 0.03 0.04 0.06 0.15
Vale 0.15 0.55 1.64 2.60
Ontario 0.07 0.03 0.78 0.71
Nyssa 0.02 0.07 1.32 1.03
Adrian 0.02 0.22 1.60 1.67
Fruitland 0.05 0.03 0.19 0.94
Parma - 0.09 1.60 0.67
Overall Average 0.06 0.15 1.03 1.11
Immatures per Plant
Growing Area 5/15 5/25 5/31 6/8
Oregon Slope/Weiser 0.00 0.00 0.00 0.26
Vale 0.00 0.41 6.28 4.20
Ontario 0.00 0.00 3.60 1.71
Nyssa 0.00 0.02 3.56 5.52
Adrian 0.00 0.00 8.42 3.64
Fruitland 0.00 0.00 0.16 2.20
Parma - 0.00 1.97 4.37
Overall Average 0.00 0.06 3.43 3.13
Total average per Plant
Growing Area 5/15 5/25 5/31 6/8
Oregon Slope/Weiser 0.03 0.04 0.06 0.42
Vale 0.15 0.96 7.92 6.79
Ontario 0.07 0.03 4.38 2.42
Nyssa 0.02 0.09 4.88 6.55
Adrian 0.02 0.22 10.01 5.31
Fruitland 0.05 0.03 0.35 3.14
Parma - 0.09 3.58 5.03
Overall Average 0.06 0.21 4.45 4.24
% Plants with Thrips
Growing Area 5/15 5/25 5/31 6/8
Oregon Slope/Weiser 0% 4% 6% 14%
Vale 0% 31% 64% 54%
Ontario 0% 3% 34% 35%
Nyssa 0% 5% 73% 56%
Adrian 0% 19% 57% 53%
Fruitland 0% 3% 17% 50%
Parma 0% 7% 54% 41%
Overall Average 0% 10% 43% 43%
As always, please let me know if you have any questions.
**********************************************
Stuart Reitz
Malheur Experiment Station
Oregon State University
595 Onion Ave.
Ontario, OR 97914
Office: 541-889-2174
Mobile: 208-740-4381
stuart.reitz@oregonstate.edu
**********************************************
Squoia Pitch Moth
Landscape and Garden Treasure Valley
Synanthedon sequoiae
Posted on: June 6, 2019 by Maria Held
Spitch moth has been found in traps.
The sequoia pitch moth (SMP) is the primary insect that causes large pitch (resin) masses on Austrian, Scotch and other ornamental pines.
SPM is not typically considered a serious pest of pines, but may cause limb dieback, unsightly resin masses, tree stress or tree death in severe cases.
There are no recommended insecticide control options for SPM.
SPM should be managed using cultural controls such as removing resin masses and larvae, proper timing of pruning, eliminating mechanical damage and proper irrigation. Avoid pruning/injuring trees April through August.
» http://ipm.ucanr.edu/PMG/PESTNOTES/pn7479.html
» https://utahpests.usu.edu/ipm/ornamental-pest-guide/arthropods/wood-borers/sequoia-pitch-moth
Western Cherry Fruit Fly 2019 Update
Cherry Treasure Valley
Western Cherry Fruit Fly WCFF
Posted on: June 5, 2019 by Paul Castrovillo
On May 29 the first 2019 Western Cherry Fruit Fly captured in an Idaho State Department of Agriculture WCFF trap was reported from Canyon County. Historically we expect to find WCFF in Gem County about a week after the first one is found in Canyon County.
Online phenology and degree-day models for WCFF predicted first flight on May 26 in Emmett, May 28 in Ontario, Parma and Boise and May 29 in Caldwell and Nampa.
If treatment for WCFF is not already underway it should begin now.
Western Cherry Fruit Fly 2019
Landscape and Garden Treasure Valley
Rhagoletis indifferens
Posted on: June 3, 2019 by Maria Held
Western Cherry Fruit Flies have been detected in Boise. Once your cherries are starting to blush (turning from green to yellow to light pink) it is time to protect them. At that stage the cherries are soft enough for being penetrated. Spraying with Surround (kaolin clay) creates a physical barrier that prevents females from laying eggs into the developing fruit.
See the links below for more options.
» http://treefruit.wsu.edu/crop-protection/opm/western-cherry-fruit-fly/
Ag Talk Tuesday - American Falls, 8:00 AM June 4, at Idaho AgCredit
All Crops All Locations
Ag Talk Tuesday
Posted on: June 3, 2019 by Juliet Marshall
Good afternoon! We will be having the next ATT meeting tomorrow morning at 8:00 AM at the Idaho AgCredit Office, 2883 ID-39, American Falls, ID.
New Call-in number for Ag Talk Tuesday sessions:
Have instant access to UI ag faculty and other attendees remotely during the Ag Talk Tuesday sessions. You can simply call a phone number to join the meeting, or you can click on the Zoom link below (the needed software will automatically download when you start or join your first Zoom meeting) to ask any questions you have or to share your observations with how crops are progressing and what current issues appear to be in your region.
Call-in: (669) 900-6833
Zoom link: https://uidaho.zoom.us/j/349427773
Attached is the summary of the last ATT discussion - what we are calling the Ag Talk Report.
Date Location Primary Topics
Hosts
June 4
Idaho AgCredit
2883 ID-39
American Falls
Early season potato issues, stand issues
Weed issues
Grain Issues
Kasia Duellman
Pam Hutchinson
Juliet Marshall
2019 Snake River Weed Research Tour, Ontario, OR
All Crops All Locations
Posted on: June 3, 2019 by Jerry Neufeld
Please mark your calendar for the 2019 Snake River Weed Research Tour
Venue: Malheur Experiment Station, 595 Onion Ave, Ontario, OR
Date: Thursday, June 13, 2019
Registration starts at 8:00am with coffee and donuts.
Recertification credits: 3 credits – Oregon and 3 credits – Idaho for full tour attendees.
The tour will start promptly at 8:30AM and end at 12:15PM.
A complementary lunch will be served at the conclusion of the tour.
The tour will feature research studies for weed management in direct-seeded onion, sugar beet, field corn, potato, and wheat. The first stop will be at our yellow nutsedge “field laboratory” along OR Hwy 201 just after crossing the rail tracks (if headed south to Nyssa from Ontario). The stop along Hwy 201 will feature studies on yellow nutsedge control in onion, sugar beet, and field corn. We will then proceed to the station and tour studies on weed control in direct-seeded onion, field corn, potato, and wheat.
This event is open to the public. Please forward the invitation to anybody who will be interested in weed management in the mentioned crops.
We will follow up with a reminder as we get close to the tour date. We are looking forward to seeing you at the tour.
Please call 541-889-2174 or email janet.jones@oregonstate.edu if you need more information.
Kind regards,
Joel Felix
Powdery Mildew on Ornamentals
Landscape and Garden Treasure Valley
Sphaerotheca pannosa var. rosae
Posted on: June 1, 2019 by Maria Held
Powdery mildew continues to be a problem with all the rain we have had. It has been reported on roses and peonies. Powdery mildews are characterized by spots or patches of white to grayish, talcum-powder-like growth.
When available choose resistant or tolerant varieties. The disease is common in crowded plantings where air circulation is poor and in damp, shaded areas. Avoid overhead irrigation once symptoms occur. Do not compost infected plant debris. Temperatures often are not hot enough to kill the fungus.
Onion Thrips update
Onion Treasure Valley
Onion thrips
Posted on: June 1, 2019 by Stuart Reitz
We had a sharp increase in thrips numbers in most areas over the past week. Fields were checked on Thursday and Friday (5/30 – 5/31). Thrips were in 90% of the fields checked this week and are being found on more plants per field now. The overall increase was largely a result of thrips beginning to reproduce in fields (as marked by the increase in immature thrips). Numbers tend to be higher in fields with larger plants. The highest numbers have been in red onion fields with plants at the 4-5 leaf stage and in early onion fields (e.g. Spanish Medallion and other early varieties). The highest numbers in the network were about 32 per plant in a red onion field (about 85% being immatures). The lowest numbers have been in fields at the 1-2 leaf stage, especially those in the Oregon Slope/Weiser area.
Expect additional movement of thrips into onion fields as more alfalfa fields get their first cutting and as rangeland weeds begin to dry down and senesce. Populations will increase rapidly with the warmer, drier weather in the forecast.
Adults per Plant
Growing Area 5/15 5/25 5/31
Oregon Slope/Weiser 0.03 0.04 0.06
Vale 0.15 0.55 1.64
Ontario 0.07 0.03 0.78
Nyssa 0.02 0.07 1.32
Adrian 0.02 0.22 1.60
Fruitland 0.05 0.03 0.19
Parma - 0.09 1.60
Overall Average 0.06 0.15 1.03
Immatures per Plant
Growing Area 5/15 5/25 5/31
Oregon Slope/Weiser 0.00 0.00 0.00
Vale 0.00 0.41 6.28
Ontario 0.00 0.00 3.60
Nyssa 0.00 0.02 3.56
Adrian 0.00 0.00 8.42
Fruitland 0.00 0.00 0.16
Parma - 0.00 1.97
Overall Average 0.00 0.06 3.43
Total average per Plant
Growing Area 5/15 5/25 5/31
Oregon Slope/Weiser 0.03 0.04 0.06
Vale 0.15 0.96 7.92
Ontario 0.07 0.03 4.38
Nyssa 0.02 0.09 4.88
Adrian 0.02 0.22 10.01
Fruitland 0.05 0.03 0.35
Parma - 0.09 3.58
Overall Average 0.06 0.21 4.45
% Plants with Thrips
Growing Area 5/15/2019 5/25/2019 5/31/2019
Oregon Slope/Weiser 3% 4% 6%
Vale 15% 31% 64%
Ontario 7% 3% 34%
Nyssa 2% 5% 73%
Adrian 2% 19% 57%
Fruitland 5% 3% 17%
Parma - 7% 54%
Overall Average 6% 10% 43%
A couple of notes unrelated to onion thrips
1 – As a result of the cool, wet spring, downy mildew has shown up in some overwinter onions in the Columbia Basin. I haven’t seen signs of it in the Treasure Valley, but it’s worth keeping an eye out for it. Even with the wet weather, I don’t think the bulb crop is at high risk since the crop is relatively small and doesn’t have a dense canopy yet that keeps moisture levels high on the leaves. It could be a greater risk for seed crops that have a denser canopy now. Please let me know if you have concerns about it in your fields.
Thanks to Carrie Wohleb and Lindsey du Toit for the pictures of downy mildew on onion foliage and flower scapes.
2 – if you have sugarbeets, there have been reports of leafminer and armyworms in beet fields.
3 –June 13 2019: Snake River Weed Research Tour, Malheur Experiment Station, 595 Onion Ave, Ontario, OR, beginning at 8:30 AM
http://www.cropinfo.net/events.php
sugarbeet leafminer and armyworm
Sugarbeets Treasure Valley
leafminer and armyworm
Posted on: May 31, 2019 by Jerry Neufeld
The Amalgamated Sugar Company crop consultants are reporting that pockets of leaf miner and army worm are starting to pop up around various locations in Treasure Valley sugarbeet fields. The links below from the Pacific Northwest Insect Management Handbook describe the damage and also show the damage these pests cause. Please contact your Amalgamated Sugar crop consultant for more details and treatment options.
» https://pnwhandbooks.org/insect/agronomic/sugar-beet/sugar-beet-leafminer
» https://pnwhandbooks.org/insect/agronomic/sugar-beet/sugar-beet-armyworm
Annual University of Idaho Snake River Weed Management Tour - June 25th - Aberdeen R&E Center
Potato All Locations
Posted on: May 30, 2019 by Pam Hutchinson
Greetings;
Please mark your calendars and plan to attend the UI Snake River Pest Management Tour at the Aberdeen R&E Center on Tuesday June 25th.
Time: 8:30 to noon followed by a sponsored lunch.
Credits: Three Idaho pesticide applicator recertification credits will be offered.
Featured will be several weed control trials in potatoes, including tank mixtures, planned vs. rescue postemergence applications, chemigation vs sprinkler incorporation as well as potato variety herbicide tolerance trials, herbicide mechanism of action plots, and Litchi tomato herbicide management.
We hope to see you there.
Thanks,
Pam
p.s. This tour was originally scheduled for June 18th but due to cold rainy conditions, our potato and weed emergence has been slowed considerably
There will be no Snake River Tour at the Kimberly R&E Center this year – we plan to fire it up again in 2020!
Stripe rust in winter wheat and Spot form of net blotch in barley (SFNB)
Small Grains All Locations
stripe rust and spot form of net blotch
Posted on: May 29, 2019 by Juliet Marshall
Stripe rust has been found today in winter wheat east of American Falls. Lesions were found on leaf tips in the upper canopy of the soft white winter wheat variety …. Wait for it……
…. Brundage.
This is likely a spring infection (not overwintering) and not widespread. Yet. With current weather conditions (perfect for stripe rust infection) expect to see the disease spread rapidly. If you have susceptible winter wheat varieties (see the UI Extension Small Grains Reports and the USDA Dr. Xianming Chen’s USDA reports for variety ratings) or susceptible spring wheat varieties, timely application of fungicides should protect vulnerable fields. Fungicide mixed with herbicide applications is recommended for susceptible spring wheat varieties as well.
Please see the attached file for the fungicide efficacy of fungicides for many diseases.
PLEASE report stripe rust occurrences ASAP to me.
Also found were symptoms of spot form of net blotch (SFNB) in spring barley. This field was in barley after barley. Fungicide with herbicide should reduce SFNB impact and stop the spread into the upper canopy.
Apple Codling Moth First Generation
Landscape and Garden Treasure Valley - Idaho
Posted on: May 22, 2019 by Maria Held
The first Apple Codling Moths have been trapped at the beginning of May (Biofix on May 2nd). However, flight activity has been slow because of rain and low temperatures. We are currently at 197 Degree Days (DD) and treatment is indicated at 220 to 250 DD expected no sooner than this weekend depending on weather conditions.
Be prepared, because this is a pest that you need to prevent all season long for clean fruit. Whether you are growing organic or conventional, the only non-spray option for clean fruit is to bag them.
» http://extension.colostate.edu/topic-areas/insects/codling-moth-control-in-home-plantings-5-613/
» https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth
» http://extension.usu.edu/files/publications/factsheet/codling-moths06.pdf
Aphid Damage
Landscape and Garden Treasure Valley
Aphid
Posted on: May 16, 2019 by Maria Held
Aphids have been found on trees (ash, plum) and ornamental plants (roses, daisies). Look for sticky sap and curled distorted leaves. A stream of water is often all that is needed to dislodge the insects from the plant.
» http://ipm.ucanr.edu/PMG/PESTNOTES/pn7404.html
» https://extension.oregonstate.edu/news/how-control-aphids-less-toxic-methods
» https://pnwhandbooks.org/insect/tree-fruit/apple/apple-woolly-apple-aphid
Ag Talk Tuesday Newsletter and schedule
All Crops All Locations
Posted on: May 15, 2019 by Juliet Marshall
The newsletter reports on the first Ag Talk Tuesday held last week in Blackfoot, and provides the schedule for the rest of the ATT events for the summer.
Cabbage Looper
Landscape and Garden Treasure Valley
Cabbage Looper Trichoplusia ni
Posted on: May 13, 2019 by Maria Held
Cabbage looper adults (moth) have been caught in pheromone traps.
Cabbage looper larvae feed on all cole crops (cabbage, broccoli, cauliflower, Brussel sprouts, kohlrabi, kale) and leave behind frass. Cover you cole crops with row cover or insect barrier to keep out the loopers.
Cull Potato Management
Potato All Locations
cull potato managment
Posted on: May 13, 2019 by Kasia Duellman
The Idaho State Department of Agriculture requires cull potatoes from all potato operations to be rendered non-viable on a daily basis after April 15th in western Idaho and after May 15th in eastern Idaho. Dr. Kasia Duellman, UI CALS Extension Seed Potato Specialist has provided additional information about cull potato management. Click of the pdf below for additional information.
Lilac/Ash borer
Landscape and Garden Treasure Valley - Idaho
Lilac/Aash borer Podosesia syringae
Posted on: May 10, 2019 by Maria Held
Lilac/Ash borers have been caught in traps. Trunk treatment of ash trees is indicated in 10-14 days when the eggs hatch.
» https://extension.colostate.edu/docs/pubs/insect/05614.pdf
Crops, Soils and Technology Field Day at the UI Parma R and E Center
All Crops Treasure Valley
Posted on: May 10, 2019 by Jerry Neufeld
The University of Idaho Crops, Soils and Technology Field Day at the UI Parma Research and Extension Center is June 7, 2019; 8:45 to 1:00 pm, followed by lunch. Click on the pdf below for more information.
Peach Leaf Curl Detected
Landscape and Garden Treasure Valley
Peach Leaf Curl
Posted on: May 7, 2019 by Maria Held
If you are experiencing symptoms of peach leaf curl make sure to spray this fall when most of the leaves are off the tree. Since it is a fungus there are no management options after infection has occurred.
» https://extension.usu.edu/files/publications/factsheet/peach-leafcurl.pdf
» https://pnwhandbooks.org/plantdisease/host-disease/peach-prunus-persica-leaf-curl
Ag Talk Tuesdays - Blackfoot, 8 AM, May 7, Idaho AgCredit, 188 W Judicial St
All Crops Eastern Idaho
Topics for this first session include but are not limited to small grains issues, early season weed control, and potato issues.
Posted on: May 3, 2019 by Juliet Marshall
We are starting this season's Ag Talk Tuesday!
The first Ag Talk Tuesday of 2019 is May 7, 8:00 AM in the conference room at Idaho AgCredit in Blackfoot, 188 W Judicial St: https://goo.gl/maps/BA9sEQsrGKDL9tQK9
Join UI Researchers, Extension Personnel, and agricultural professionals to learn about timely topics in crop production. These events will be offered on the first and third Tuesdays at 8AM throughout the growing season at different locations in eastern Idaho. Venue and location differ from session to session, so look for the announcements via Treasure Valley Pest Alerts (http://tvpestalert.net/), from UI Extension personnel, on the UI Extension Calendar (https://www.uidaho.edu/extension/news/calendar), and through the Potato Country website (https://potatocountry.com).
Topics for this first session include but are not limited to small grains issues, early season weed control, and potato issues.
Light breakfast fare will be provided (such as coffee, juice, and donuts).
lygus bug-alfalfa seed, 2019
Alfalfa Seed Treasure Valley
lygus bug
Posted on: May 2, 2019 by Jerry Neufeld
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University and the IPM Centers - PNW Coalition shows that, depending on your location in the Treasure Valley, we have accumulated 175 degree days between January 1, 2019 and May 2, 2019. This is 5 days behind 2018, and the same as the 30-year average. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 272 accumulated degree days; this will occur around May 15, and is the time monitoring for lygus bugs in alfalfa seed fields should begin.
When using most insecticides, fields should be treated when numbers of lygus bugs reach 4-5 lygus bug nymphs per 180 degree sweep. Growers using Assail, or Beleaf, as stand-alone sprays probably should treat before 4th instar nymphs are detected.
Below are the instructions for using the degree day calculator.
1) Select the location nearest you by selecting the appropriate pin in the map at the top of the page. The above data are for the Parma location. Results likely will vary depending on the location selected.
2) Select “insects” in the category drop down box under the map, then select the “Lygus bug [alfalfa seed] Ben Simko 2000” model from the “Select model” link to the right of the Model box. It should be model 61 in the list.
3) The predicted date for the 275 degree day accumulation for peak 1st and 2nd instar lygus nymphs will be listed in the “DDs Event” text box. You also can view the full model output by selecting the button labeled “Click here to CALC/ RUN model w/daily output”
Also, below are the links to the “alfalfa seed-lygus bug” page in the PNW Insect Management Handbook, and the Assail label on the Idaho State Department of Agriculture website.
» https://pnwhandbooks.org/insect/legume-grass-field-seed/alfalfa/alfalfa-seed-lygus-bug
» https://agri.idaho.gov/main/56-2/pesticides/product-registration-2/pesticide-label-search/
sugarbeet root maggot, 2019
Sugarbeets All Locations
Posted on: April 29, 2019 by Jerry Neufeld
The growing degree day calculator (gdd) (hosted by the Integrated Plant Protection Center at Oregon State University; http://uspest.org/cgi-bin/ddmodel.us) for the sugarbeet root maggot fly shows that—depending on your location in the Treasure Valley—we have accumulated 295 gdd since January 1, 2019 and 263 gdd in the Magic Valley. Peak flight of root maggot flies should occur after 360 accumulated gdd when the maximum high temperature exceeds 80 degrees F. In the Treasure Valley this will be about May 7, in the Magic Valley this will be about May 12. The gdd model does an excellent job of predicting peak flight, but monitoring with orange sticky stake traps is the best way to get local information on fly numbers for a given field to determine if you have the threshold numbers of flies.
Root maggot flies will lay eggs near sugarbeet plants. After the larvae hatch they will begin feeding on the young sugarbeets. Look for these pests to appear in the western end of the Treasure Valley first. The optimal timing for applying granular insecticides against root maggots is within 10 days of peak flight. Granular insecticides must be watered in well to get good uptake by the sugarbeets. The link below from the 2019 PNW Insect Management handbook contains additional information about the sugarbeet root maggot. Visit with your field consultant from TASCO for treatment options.
» https://pnwhandbooks.org/insect/agronomic/sugar-beet/sugar-beet-sugar-beet-root-maggot
cutworms in sugarbeets in Jamieson, Oregon area
Sugarbeets Treasure Valley
cutworms
Posted on: April 25, 2019 by Jerry Neufeld
Amalgamated Sugar Company Field Consultant, Aaron Searle is reporting that cutworms and wireworms have been found in sugarbeet fields near Jamieson, Oregon. There are several species of cutworms that attack sugarbeets, but all are nocturnal, so you may see injury but not readily find the insect damaging the sugarbeets. Cutworms are usually worse in fields where there is crop residue, such as following alfalfa or corn. If you see “skips” in the field, dig around in the soil where you would have expected a plant and you will likely find the lower portion of a cut plant. Larvae are often found less than an inch below the soil surface near a damaged plant. Contact your TASCO Field Consultant for treatment options. Below is the link to the PNW Insect Management Handbook for cutworms in sugarbeets.
» https://pnwhandbooks.org/insect/agronomic/sugar-beet/sugar-beet-cutworm
Weekend Weather Favored Fire Blight Development
Landscape and Garden All Locations
Fire Blight
Posted on: April 23, 2019 by Maria Held
Weather conditions over the past weekend (rain and higher temperatures) were favorable for fire blight as pear and apple trees are blooming. This bacterial disease affects the rose plant family (Rosaceae ).
Temperatures over 70 F and moisture (rain, dew) foster fire blight development.
Monitor trees closely starting two weeks after full bloom (which is when infections start to become visible). Prune out new infections immediately (on a dry day).
Refer to the references below for additional information:
» https://pnwhandbooks.org/plantdisease/host-disease/apple-malus-spp-fire-blight
» http://treefruit.wsu.edu/crop-protection/disease-management/fire-blight/
