Helena MT - E5549
Data is up through August 28, 2025
Growing Degree Days since January 1:
Apple Maggot
Biofix: January 1, 2025
Degree Days since Biofix:2579
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, 2025
Degree Days since Biofix:3594
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, 2025
Degree Days since Biofix:2264
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, 2025
Degree Days since Biofix:1620
Moth Flight: 87% of moths in 2nd generation have emerged
Egg Hatch: 56% of moths in 2nd generation have hatched.
Management Action 1 Week Ago:none
Present Management Action:September 1 to September 4 - 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 4 - 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, 2025
Degree Days since Biofix:1661
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, 2025
Degree Days since Biofix:1314
Management Action 1 Week Ago:August 22 to August 23 - Most larvae of the first generation are mature.
Present Management Action:August 31 to September 1 - Larval feeding of the first generation ends (most are now in the pupal stage).
Management Action for the Next 3 Weeks:September 10 to September 12 - Second generation egg hatch begins; apply treatment now if necessary.
For a current Obliquebanded Leafroller summary click here.
Peach Twig Borer
Biofix: June 7, 2025
Degree Days since Biofix:1394
Moth Flight: 86.8% of moths in 2nd generation have emerged
Egg Hatch: 35.5% of moths in 2nd generation have hatched.
Management Action 1 Week Ago:August 20 to August 23 - 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, 2025
Degree Days since Biofix:1548
Males: Adult Males is over for the season
Crawlers: 41% of crawlers in 1st generation have emerged.
Management Action 1 Week Ago:none
Present Management Action:August 28 to September 4 - 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 4 to September 5 - 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, 2025
Degree Days since Biofix:1809
Management Action 1 Week Ago:August 24 to August 25 - 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 9 to September 11 - 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, 2025
Degree Days since Biofix:3028
Management Action 1 Week Ago:none
Present Management Action:September 2 - 50% of adults have emerged.
Management Action for the Next 3 Weeks:September 16 - 90% of adults have emerged.September 19 - 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 2025
Degree Days since March:3028
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.