Bozeman MT - BOZM
Data is up through July 31, 2026
Growing Degree Days since January 1:
Apple Maggot
Biofix: January 1, 2026
Degree Days since Biofix:1916
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:2780
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:1484
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 11, 2026
Degree Days since Biofix:1025
Moth Flight: 6.3% of moths in 1st generation have emerged
Egg Hatch: Egg Hatch is over for the season
Management Action 1 Week Ago:July 26 - First Generation end of egg hatch.
Your last insecticide spray of the first generation should provide protection up to this date.
Your last insecticide spray of the first generation should provide protection up to this date.
Present Management Action:August 3 to August 5 - 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).
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:August 19 to August 22 - Second Generation, start of peak egg hatch.
Make sure fruit is protected at least through the peak period, which ends at 1700 degree days.
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:1181
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 25, 2026
Degree Days since Biofix:708
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:August 8 to August 10 - End of first generation egg hatch.August 17 to August 18 - Second generation moth flight begins.August 21 to August 22 - 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:848
Moth Flight: 0.4% of moths in 1st generation have emerged
Egg Hatch: Egg Hatch is over for the season
Management Action 1 Week Ago:July 28 - End sprays for first summer generation. (Egg hatch ends.)
Present Management Action:none
Management Action for the Next 3 Weeks:August 19 to August 26 - 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 11, 2026
Degree Days since Biofix:964
Males: 19.8% 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:1267
Management Action 1 Week Ago:none
Present Management Action:July 30 - Continue servicing traps. Adult emergence of the 2nd generation of flies is peaking at this time.
Management Action for the Next 3 Weeks:August 10 to August 11 - 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.August 27 - Continue servicing traps. Adult emergence of the 3rd generation of flies is peaking at this time.
Peak egg-laying by 2nd generation flies is now occurring.August 27 - Continue servicing traps. Adult emergence of the 3rd generation of flies is peaking at this time.
For a current Spotted Wing Drosophila summary click here.
Walnut Husk Fly
Biofix: January 1, 2026
Degree Days since Biofix:2300
Management Action 1 Week Ago:July 28 - Mature females. If using conventional insecticides, start applications now and continue until harvest (apricot, peach) or until one month before harvest (walnut).
Present Management Action:August 5 - Females have begun egg-laying. They insert eggs inside the host nut or fruit.
Management Action for the Next 3 Weeks:August 13 - Egg hatch begins inside host nut or fruit.August 15 - 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:2300
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.