Corvallis MT - COVM
Data is up through May 27, 2026
Growing Degree Days since January 1:
Apple Maggot
Biofix: January 1, 2026
Degree Days since Biofix:675
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:1117
Management Action 1 Week Ago:May 21 - 30% of adult billbugs are present. If making a preventive treatment (for example, neonicotinoids, anthranilic diamides, or pyrethroids), apply now.
Present Management Action:none
Management Action for the Next 3 Weeks:June 11 - 50% of billbug adults are active. If making a curative treatment(for example, neonicotinoid or pyrethroid), apply now.
For a current Billbugs summary click here.
Cereal Leaf Beetle
Biofix: May 6, 2026
Degree Days since Biofix:258
Management Action 1 Week Ago:May 19 to May 21 - Peak CLB egg numbers occur on small grain foliage.
Early scouting now can identify fields that could be at risk of significant CLB damage this year.
It is too early to take control action, however (instead, scouting should be repeated at 325).
Early scouting now can identify fields that could be at risk of significant CLB damage this year.
It is too early to take control action, however (instead, scouting should be repeated at 325).
Present Management Action:May 30 to May 31 - Overall field populations of CLB now include approximately 50% eggs and 50% larvae. <br><br>Now is an excellent time to sample to determine whether there will be need for control (see CLB Utah Pests Fact Sheet). <br><br>If control needed, it is best if possible to apply between 400 and 450 DD rather than earlier (to minimize harm to biological control of CLB by parasitic wasps).
Management Action for the Next 3 Weeks:June 7 to June 8 - If needed, apply control (see CLB Utah Pests Fact Sheet)June 11 to June 15 - Peak CLB larval numbers occur on small grain foliage (and egg-laying is essentially finished).
If sufficient numbers of CLB to merit control have not yet occurred in a given field (see CLB Utah Pests Fact Sheet), they are very unlikely to do so this growing season.
Not applying insecticide at this time will maximize future benefit from biological control.
If sufficient numbers of CLB to merit control have not yet occurred in a given field (see CLB Utah Pests Fact Sheet), they are very unlikely to do so this growing season.
Not applying insecticide at this time will maximize future benefit from biological control.
For a current Cereal Leaf Beetle summary click here.
Codling Moth - Trap Biofix
Biofix: May 10, 2026
Degree Days since Biofix:129
Moth Flight: 21.3% of moths in 1st generation have emerged
Egg Hatch: Egg Hatch is over for the season
Management Action 1 Week Ago:none
Present Management Action:June 3 - Optional management strategy for First Generation.
Apply horticultural oil to smother eggs that have been laid up to this point. Good coverage is essential.
The next spray will not be applied until the date that corresponds to 350 degree days.
Apply horticultural oil to smother eggs that have been laid up to this point. Good coverage is essential.
The next spray will not be applied until the date that corresponds to 350 degree days.
Management Action for the Next 3 Weeks:June 3 - Optional management strategy for First Generation.
Apply horticultural oil to smother eggs that have been laid up to this point. Good coverage is essential.
The next spray will not be applied until the date that corresponds to 350 degree days.June 5 - Egg hatch for first generation begins.
Apply the first insecticide application (Delegate, Altacor, Assail, Belt, Intrepid, etc.) and continue every 14-21 days until the end of first generation egg hatch, which corresponds to the date at 920 degree days (typically 2-3 additional sprays depending on temperatures).June 18 - First Generation, start of peak egg hatch.
Make sure fruit is protected at least through the peak period, which ends at 640 degree days.June 19 - Optional management strategy for First Generation.
This action only applies if you used horticultural oil at the date corresponding to 200 degree days.
Apply first cover spray (Altacor, Delegate, Belt, Assail, Intrepid, etc.). Repeat applications every 14-21 days until end of egg hatch, which is the date corresponding to 920 degree days (typically 1 additional spray).
Apply horticultural oil to smother eggs that have been laid up to this point. Good coverage is essential.
The next spray will not be applied until the date that corresponds to 350 degree days.June 5 - Egg hatch for first generation begins.
Apply the first insecticide application (Delegate, Altacor, Assail, Belt, Intrepid, etc.) and continue every 14-21 days until the end of first generation egg hatch, which corresponds to the date at 920 degree days (typically 2-3 additional sprays depending on temperatures).June 18 - First Generation, start of peak egg hatch.
Make sure fruit is protected at least through the peak period, which ends at 640 degree days.June 19 - Optional management strategy for First Generation.
This action only applies if you used horticultural oil at the date corresponding to 200 degree days.
Apply first cover spray (Altacor, Delegate, Belt, Assail, Intrepid, etc.). Repeat applications every 14-21 days until end of egg hatch, which is the date corresponding to 920 degree days (typically 1 additional spray).
For a current Codling Moth - Trap Biofix summary click here.
Fire Blight
*This model only applies when trees are in bloom.
4-day Risk Value: 526
Blight potential for today and next two days:
For a current Fire Blight summary click here.
4-day Risk Value: 526
Blight potential for today and next two days:
| Condition | Today | Tomorrow | Next Day |
|---|---|---|---|
| If blight was in your orchard last year | EXCEPTIONAL | EXCEPTIONAL | EXCEPTIONAL |
| If blight was only nearby last year | EXCEPTIONAL | EXCEPTIONAL | EXCEPTIONAL |
| If no blight last year | HIGH | HIGH | HIGH |
Greater Peachtree Borer
Biofix: January 1, 2026
Degree Days since Biofix:382
Management Action 1 Week Ago:none
Present Management Action:May 30 to June 2 - Hang pheromone trap to monitor for first flight of this clearwing moth.
Management Action for the Next 3 Weeks:none
For a current Greater Peachtree Borer summary click here.
Obliquebanded Leafroller
Biofix: Not established yet for 2026
Degree Days since March:635
Management Action 1 Week Ago:May 25 to May 26 - Hang pheromone trap in orchard.
Present Management Action:May 27 to May 31 - Hang pheromone trap in orchard.
Management Action for the Next 3 Weeks:June 21 to June 24 - First moths of the summer generation are expected.
For a current Obliquebanded Leafroller summary click here.
Peach Twig Borer
Biofix: Not established yet for 2026
Degree Days since March:359
Management Action 1 Week Ago:May 23 - Place pheromone trap in orchard to get biofix (first moth flight)
Present Management Action:May 30 to June 3 - First moths expected
Management Action for the Next 3 Weeks:June 3 to June 5 - First moths expected
For a current Peach Twig Borer summary click here.
San Jose Scale
Biofix: May 10, 2026
Degree Days since Biofix:119
Males: 93.8% of adult males in 1st generation have emerged.
Crawlers: Crawlers is over for the season
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:382
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:June 9 to June 10 - Hang monitoring traps. Adult flies of the 1st generation begin emerging.
In addition, egg-laying on wild or early fruits by overwintering females is at its peak.June 14 to June 15 - If SWD has been confirmed on your fruit farm, now is the time to begin protecting fruits with insecticides because the 1st generation females have begun egg-laying.
In addition, egg-laying on wild or early fruits by overwintering females is at its peak.June 14 to June 15 - If SWD has been confirmed on your fruit farm, now is the time to begin protecting fruits with insecticides because the 1st generation females have begun egg-laying.
For a current Spotted Wing Drosophila summary click here.
Walnut Husk Fly
Biofix: January 1, 2026
Degree Days since Biofix:866
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:none
For a current Walnut Husk Fly summary click here.
Western Cherry Fruit Fly
Biofix: Not established yet for 2026
Degree Days since March:866
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.
