Bozeman MT - BOZM
Data is up through September 19, 2026
Growing Degree Days since January 1:
Apple Maggot
Biofix: January 1, 2026
Degree Days since Biofix:2941
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:4131
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:2506
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:1761
Moth Flight: Moth Flight is over for the season
Egg Hatch: Egg Hatch is over for the season
Management Action 1 Week Ago:September 11 to September 13 - 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.
Present Management Action:none
Management Action for the Next 3 Weeks:none
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:1896
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:1690
Management Action 1 Week Ago:September 11 - Second generation egg hatch begins; apply treatment now if necessary.
Present Management Action:none
Management Action for the Next 3 Weeks:none
For a current Obliquebanded Leafroller summary click here.
Peach Twig Borer
Biofix: June 4, 2026
Degree Days since Biofix:1584
Moth Flight: Moth Flight is over for the season
Egg Hatch: Egg Hatch 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 Peach Twig Borer summary click here.
San Jose Scale
Biofix: May 11, 2026
Degree Days since Biofix:1652
Males: Adult Males is over for the season
Crawlers: Crawlers is over for the season
Management Action 1 Week Ago:September 11 to September 18 - 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.
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:2003
Management Action 1 Week Ago:September 15 to September 18 - 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.
Present Management Action:none
Management Action for the Next 3 Weeks:none
For a current Spotted Wing Drosophila summary click here.
Walnut Husk Fly
Biofix: January 1, 2026
Degree Days since Biofix:3473
Management Action 1 Week Ago:September 15 - 90% of adults have emerged.September 18 - Larvae begin exiting the host fruits or nuts to drop to the ground to pupate.
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:3473
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.