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Pest Alert – Codling Moth Activity Increasing in Apples
Apple Treasure Valley, Treasure Valley - Idaho
Codling Moth
Posted on: June 3, 2025 by Jemila Chellappa
Treasure Valley (Canyon County, Idaho)
June 2025
Moth captures confirmed from pheromone trap at local orchard (7 moths/trap/week)
Codling moth (Cydia pomonella) adult flight is active in the Treasure Valley region, with degree day (GDD) accumulations reaching ~680 (Base 50°F) as of June 2, 2025. Trap monitoring has confirmed moderate to high pressure, with 7 moths captured per trap this week.
- Track daily GDDs to prepare for second-generation sprays (expected at 1000–1100 GDD).
- Continue weekly trap monitoring to refine timing.
This timing coincides with peak first-generation egg hatch. Immediate action is advised to prevent worm damage to apples.
- Egg hatch typically begins at 250 GDD
- Peak egg hatch occurs between 650–750 GDD
- Now, in the critical larval emergence window
Recommended IPM Management Actions: Spray Immediately to Control Larvae
Apply a larvicide now to target newly hatched larvae. Follow label instructions and re-treatment intervals. Reapply if moth captures remain above the threshold.
Cultural & Mechanical Controls
- Thin fruit clusters to reduce entry points (leave one fruit per cluster, space ~6" apart).
- Remove and destroy infested or fallen fruit weekly.
- Bag fruit at quarter-size after spraying (brown paper bags or nylon footies with kaolin clay pre-soak).
- Keep trap records: If weekly trap catch exceeds 5–10 moths per trap, additional sprays may be needed.
Resistance Management
- Rotate modes of action (IRAC group) each generation to avoid resistance.
- Limit broad-spectrum insecticides that can flare up mites and reduce beneficial insects.
There are different management options to consider when controlling this pest.There are different management options to consider when controlling this pest.
https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth
Option A: Starting at 200 DD, apply a mixture of water and horticultural oil at 1% concentration to smother egg infestation. Follow with the first application of insecticide at 350 DD. Reapply insecticides based on the protection interval stated on the label.
Option B: Starting at 220-250 DD, apply insecticides that target newly hatched larvae. Reapply insecticides based on the protection interval stated on the label.
The reference publication links to view insecticide options for commercial or residential sites.
This pest needs prevention all season long for clean fruit.
https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1879&context=extension_curall
https://extension.colostate.edu/topic-areas/insects/codling-moth-control-in-home-plantings-5-613/
To report pest activity in your area: https://pnwpestalert.net/submitalert/
Pest Alert: Found One Codling Moth in the Canyon County Apple Trees
Apple Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley
Apple Codling Moth
Posted on: May 28, 2025 by Jemila Chellappa
Codling moth is a key insect pest of apples and pears in Idaho. Left unmanaged, it can cause "wormy" fruit and significant crop loss.
Identification – Know the Signs & Symptoms
Stage | Identification |
Adult Moth | Grayish-brown, 1/2 inch long, with a coppery-brown band at wing tips. |
Egg | Tiny, flat, and translucent – laid singly on fruit or leaves. |
Larva | Creamy white to pink caterpillar with a dark brown head – this is the “worm.” |
Pupa | Formed in bark crevices or leaf litter in silken cocoons. |
Symptoms on Fruit:
- Small, dark entry holes ("sting") on the apple surface.
- Frass (sawdust-like excrement) near the hole.
- Tunnels inside the fruit leading to the core.
- Premature fruit drop in severe infestations.
Current Monitoring & Degree Days
- Biofix (first moth detected): Mid-May
- Current Degree Days (base 50°F): 206 DD as of May 18
- Egg hatch begins: 220–250 DD – NOW is the time for action!
Management Options
Option A: Early Prevention (Egg Smothering)
- When: At 200 DD
- Action: Apply horticultural oil (1% concentration) to suffocate eggs.
- Follow-Up: Insecticide at 350 DD.
Option B: Target Larvae
- When: 220–250 DD
- Action: Apply insecticides to kill newly hatched larvae before they burrow into fruit.
Insecticide Options: Refer https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth
Always read and follow the label directions for safety and effectiveness.
Non-Chemical Options
- Fruit Bagging: Bag individual fruitlets to block larvae entry.
- Sanitation: Remove dropped fruit and prune trees to reduce overwintering sites.
- Trapping: Use pheromone traps to monitor moth flights and guide sprays.
Season-Long Strategy: Codling moth has multiple generations per season. Continue monitoring traps and tracking degree days to time follow-up sprays or control measures.
Helpful Resources
https://climate.usu.edu/includes/pestFactSheets/Codling-Moth.pdf
https://extension.colostate.edu/topic-areas/insects/codling-moth-control-in-home-plantings-5-613/
For more assistance, contact your local University of Idaho Extension office https://www.uidaho.edu/extension/directory/counties
Keep your fruit clean and healthy – act now!
2023 Fire Blight
Apple Treasure Valley, Treasure Valley - Idaho
Fire Blight
Posted on: May 3, 2023 by Ruth Givens
Fire blight is a bacterial plant disease that causes infections through open flowers on apple and pear (Rosaceae family). Infections occur during warm, wet days. A model is used to predict fire blight risk.
Based on the model, there is a very high potential for infection on open blossoms April 27 – early June. Fire blight is a disease that needs moisture (rain, dew) to cause infection. Higher upcoming temperatures increase the chance for infection with precipitation or dew moisture. Protect the blossoms of young trees and trees that had fire blight last year.
Monitor trees closely starting two weeks after bloom and prune out new infections immediately during dry conditions.
Refer to publications below for additional information for your application.
https://pnwhandbooks.org/plantdisease/host-disease/pear-pyrus-spp-fire-blight
https://pnwhandbooks.org/plantdisease/host-disease/apple-malus-spp-fire-blight
http://treefruit.wsu.edu/crop-protection/disease-management/fire-blight/
2020 Fire Blight - Model Predicts Outbreak Conditions High April 28 - May 2
Apple Treasure Valley
Fire Blight
Posted on: April 27, 2020 by Nic Usabel
Fire blight is a bacterial plant disease that causes infections through open flowers on apple and pear (Rosaceae family). Infections occur during warm, wet days.
Based on the model, there is a very high potential for infection on open blossoms April 28 – May 2. Fire blight is a disease that needs moisture (precipitation, dew) to cause infection. Higher upcoming temperatures increase the chance for infection with precipitation or dew moisture. Protect the blossoms of young trees and trees that had fire blight last year.
Monitor trees closely starting two weeks after bloom and prune out new infections immediately during dry conditions.
Refer to publications below for additional control methods for your application.
» https://pnwhandbooks.org/plantdisease/host-disease/pear-pyrus-spp-fire-blight
» https://pnwhandbooks.org/plantdisease/host-disease/apple-malus-spp-fire-blight
» http://treefruit.wsu.edu/crop-protection/disease-management/fire-blight/
Coddling Moth 2018
Apple Treasure Valley
Posted on: May 21, 2018 by Dian Roberson
Coddling Moth has been detected in traps so it is time to take action! This is a small moth that lays eggs on the blossom end of Apple and Pear fruit. The larvae them bore into and ruin your fruit. Check out the publications and links below to help you choose the best control for your landscape.
» 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
Fire Blight Confirmed
Apple All Locations
Erwinia Amylavora
Posted on: May 18, 2018 by Rich Guggenheim
Fire Blight has been confirmed in Canyon County. This bacterial infection can attack anything in the rose family (Rosaceae). It is especially destructive to apples (Malus spp.), pears (Pyrus spp.), and crabapples (Malus spp.). There is no cure for fire blight. Prevention is the best solution. Purchase resistant varieties, minimize rapid growth and succulent tissue, prune out blighted twigs and cankered branches. Check out the publications and websites below for more information.
http://treefruit.wsu.edu/crop-protection/disease-management/fire-blight/
https://masters.agron.iastate.edu/redirect/514/lesson04/FireBlight.html
http://extension.colostate.edu/docs/pubs/garden/02907.pdf
» https://pnwhandbooks.org/plantdisease/host-disease/apple-malus-spp-fire-blight
» http://pnwpestalert.net/uploads/fire_blight.pdf
Environmental Conditions Favor Fire Blight Development
Apple All Locations
Erwinia amylovora.
Posted on: April 6, 2018 by Rich Guggenheim
Current environmental conditions favor the development of Fire Blight in apple and related family of trees such as pyracantha, hawthorn, and cotoneaster. This disease does not affect stone fruit such as cherries, plum, apricot, or peach.
Management is best controlled by puning out diseased plant parts. Bordeaux mixture, Streptomycin, and copper sprays are also used to manage this bacterial disease.
» http://extension.usu.edu/files/factsheets/Disease%20027%20UPDC%20Fire%20blight.PDF
» http://treefruit.wsu.edu/crop-protection/disease-management/fire-blight/
» http://extension.colostate.edu/topic-areas/yard-garden/fire-blight-2-907/
Codling Moth (Cydia pomonella)
Apple All Locations
Lepidoptera: Tortricidae
Posted on: May 3, 2017 by Rich Guggenheim
Codling moth has been trapped in Sunny slope orchards.
To successfully control codling moth in fruit trees, larvae must
be prevented from entering fruit. Controls must be applied
at a specific time. Once the eggs hatch and larvae enter the fruit, control
measures are ineffective.
Management includes a rigorous and routine schedule of spray insecticides, both organic and traditional, every 10 to 14 days depending on label instructions.
» http://jenny.tfrec.wsu.edu/opm/displayspecies.php?pn=5
» http://ipm.ucanr.edu/PMG/r4300111.html
» http://ipm.ucanr.edu/PMG/PESTNOTES/pn7412.html
» http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1664&context=extension_curall
Coddling Moth
Apple All Locations
Posted on: May 6, 2002 by Tim Davis
The biofix date for the Coddling Moth has been set for April 29. Using this date on the degree-day calculator made available on the Oregon State Universities website the first hatch will not occur until May 25. This date is later than previous years as we have had a cool spring. Another alert will be posted 7-10 days before the predicted hatch.
