Corvallis MT - COVM
Data is up through August 28, 2026
Growing Degree Days since January 1:
Apple Maggot
Biofix: January 1, 2026
Degree Days since Biofix:2671
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:none
For a current Apple Maggot summary click here.
Billbugs
Biofix: January 13, 2026
Degree Days since Biofix:3704
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:none
For a current Billbugs summary click here.
Cereal Leaf Beetle
Biofix: May 6, 2026
Degree Days since Biofix:2218
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:none
For a current Cereal Leaf Beetle summary click here.
Codling Moth - Trap Biofix
Biofix: May 10, 2026
Degree Days since Biofix:1600
Moth Flight: 85% of moths in 2nd generation have emerged
Egg Hatch: 53% of moths in 2nd generation have hatched.
Management Action 1 Week Ago:none
Present Management Action:September 3 - Second Generation, end of peak egg hatch.
Egg hatch is waning for the second generation, and will be completely over by 2100 degree days.
Egg hatch is waning for the second generation, and will be completely over by 2100 degree days.
Management Action for the Next 3 Weeks:September 3 to September 7 - Second Generation, end of peak egg hatch.
Egg hatch is waning for the second generation, and will be completely over by 2100 degree days.
Egg hatch is waning for the second generation, and will be completely over by 2100 degree days.
For a current Codling Moth - Trap Biofix summary click here.
Fire Blight
*This model only applies when trees are in bloom.
Greater Peachtree Borer
Biofix: January 1, 2026
Degree Days since Biofix:1643
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:none
For a current Greater Peachtree Borer summary click here.
Obliquebanded Leafroller
Biofix: June 21, 2026
Degree Days since Biofix:1247
Management Action 1 Week Ago:August 19 to August 21 - Second generation moth flight begins.August 24 to August 25 - Most larvae of the first generation are mature.
Present Management Action:September 3 - Larval feeding of the first generation ends (most are now in the pupal stage).
Management Action for the Next 3 Weeks:September 3 to September 4 - Larval feeding of the first generation ends (most are now in the pupal stage).September 16 to September 19 - Second generation egg hatch begins; apply treatment now if necessary.
For a current Obliquebanded Leafroller summary click here.
Peach Twig Borer
Biofix: June 4, 2026
Degree Days since Biofix:1397
Moth Flight: 87.4% of moths in 2nd generation have emerged
Egg Hatch: 36.3% of moths in 2nd generation have hatched.
Management Action 1 Week Ago:August 19 to August 22 - Begin sprays for second summer generation. Choose a later date in this time span if damage was light in your orchard last year. These dates correspond to 5% - 16% egg hatch.
Present Management Action:none
Management Action for the Next 3 Weeks:none
For a current Peach Twig Borer summary click here.
San Jose Scale
Biofix: May 10, 2026
Degree Days since Biofix:1515
Males: Adult Males is over for the season
Crawlers: 33.8% of crawlers in 1st generation have emerged.
Management Action 1 Week Ago:none
Present Management Action:August 30 to September 3 - Second generation crawlers are most active now. If you have a heavy infestation, treat at this time with Esteem or 1% horticultural oil. Otherwise, wait and spray with oil next spring at budbreak.
Management Action for the Next 3 Weeks:September 3 to September 9 - Second generation crawlers are most active now. If you have a heavy infestation, treat at this time with Esteem or 1% horticultural oil. Otherwise, wait and spray with oil next spring at budbreak.
For a current San Jose Scale summary click here.
Spotted Wing Drosophila
Biofix: January 1, 2026
Degree Days since Biofix:1853
Management Action 1 Week Ago:August 21 to August 22 - Continue servicing traps. Adult emergence of the 3rd generation of flies is peaking at this time.
Present Management Action:none
Management Action for the Next 3 Weeks:September 7 to September 9 - Continue to keep fruit protected with insecticides if spotted wing has been confirmed on your fruit farm.
Peak egg-laying by 3rd generation flies is now occurring.
Peak egg-laying by 3rd generation flies is now occurring.
For a current Spotted Wing Drosophila summary click here.
Walnut Husk Fly
Biofix: January 1, 2026
Degree Days since Biofix:3129
Management Action 1 Week Ago:none
Present Management Action:August 28 - 50% of adults have emerged.
Management Action for the Next 3 Weeks:September 11 to September 12 - 90% of adults have emerged.September 15 - Larvae begin exiting the host fruits or nuts to drop to the ground to pupate.
For a current Walnut Husk Fly summary click here.
Western Cherry Fruit Fly
Biofix: Not established yet for 2026
Degree Days since March:3129
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:none
For a current Western Cherry Fruit Fly summary click here.