Corvallis MT - COVM
Data is up through July 23, 2026
Growing Degree Days since January 1:
Change Station:
Apple Maggot
Biofix: January 1, 2026
Degree Days since Biofix:1805
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:2610
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:1370
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:943
Moth Flight: 2.2% of moths in 1st generation have emerged
Egg Hatch: 99% of moths in 1st generation have hatched.
Management Action 1 Week Ago:July 22 - First Generation end of egg hatch.

Your last insecticide spray of the first generation should provide protection up to this date.
Present Management Action:July 30 - Second Generation egg hatch begins.

Start sprays (Delegate, Altacor, Assail, Belt, Intrepid, etc.) and continue every 14-21 days until end of egg hatch, which corresponds to 2100 degree days (typically 2-3 additional sprays depending on temperatures).
Management Action for the Next 3 Weeks:July 30 to August 1 - Second Generation egg hatch begins.

Start sprays (Delegate, Altacor, Assail, Belt, Intrepid, etc.) and continue every 14-21 days until end of egg hatch, which corresponds to 2100 degree days (typically 2-3 additional sprays depending on temperatures).

August 14 to August 17 - Second Generation, start of peak egg hatch.

Make sure fruit is protected at least through the peak period, which ends at 1700 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:1096
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:594
Management Action 1 Week Ago:July 15 - Egg hatch of first generation begins. Apply a treatment that targets larvae. Options, in order of efficacy are: Delegate, Altacor, Intrepid (add adjuvant), Entrust, or Sevin. All last approximately 14 days, except Entrust, which lasts 7. A second application may be necessary based on orchard history and scouting.

July 16 - If using a Bt product (Bacillus thuringiensis, organic) apply now. Products like Dipel only last 5-7 days and may need to be reapplied to last the larval stage. Note that larvae need to ingest the Bt for it to work. Bt will not work on mature larvae.
Present Management Action:none
Management Action for the Next 3 Weeks:August 7 to August 9 - End of first generation egg hatch.

August 17 - Second generation moth flight begins.

August 20 - Most larvae of the first generation are mature.
For a current Obliquebanded Leafroller summary click here.
Peach Twig Borer
Biofix: June 4, 2026
Degree Days since Biofix:740
Moth Flight: Moth Flight is over for the season
Egg Hatch: 99% of moths in 1st generation have hatched.
Management Action 1 Week Ago:none
Present Management Action:July 25 - End sprays for first summer generation. (Egg hatch ends.)
Management Action for the Next 3 Weeks:August 16 to August 20 - 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.
For a current Peach Twig Borer summary click here.
San Jose Scale
Biofix: May 10, 2026
Degree Days since Biofix:888
Males: 6.8% of adult males in 1st generation have emerged.
Crawlers: 99.4% of crawlers in 1st generation have emerged.
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:none
For a current San Jose Scale summary click here.
Spotted Wing Drosophila
Biofix: January 1, 2026
Degree Days since Biofix:1196
Management Action 1 Week Ago:July 15 - Continue to keep fruit protected with insecticides if spotted wing has been confirmed on your fruit farm.

Peak egg-laying by 1st generation flies is now occurring.
Present Management Action:July 25 to July 26 - Continue servicing traps. Adult emergence of the 2nd generation of flies is peaking at this time.
Management Action for the Next 3 Weeks:August 5 to August 6 - Continue to keep fruit protected with insecticides if spotted wing has been confirmed on your fruit farm.

Peak egg-laying by 2nd 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:2161
Management Action 1 Week Ago:July 15 - First adult emergence. If using spinosad or GF-120, start applications now and continue until harvest (apricot, peach) or until one month before harvest (walnut).
Present Management Action:July 25 - Mature females. If using conventional insecticides, start applications now and continue until harvest (apricot, peach) or until one month before harvest (walnut).
Management Action for the Next 3 Weeks:August 2 - Females have begun egg-laying. They insert eggs inside the host nut or fruit.

August 10 - Egg hatch begins inside host nut or fruit.

August 11 - 10% of adults have emerged.
For a current Walnut Husk Fly summary click here.
Western Cherry Fruit Fly
Biofix: Not established yet for 2026
Degree Days since March:2161
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.