Helena MT - E5549
Data is up through August 6, 2025
Growing Degree Days since January 1:
Apple Maggot
Biofix: January 1, 2025
Degree Days since Biofix:2037
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:2906
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:1728
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:1214
Moth Flight: 28.1% of moths in 2nd generation have emerged
Egg Hatch: 3.7% of moths in 2nd generation have hatched.
Management Action 1 Week Ago:August 1 to August 3 - 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).
Present Management Action:none
Management Action for the Next 3 Weeks:August 16 to August 18 - 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, 2025
Degree Days since Biofix:1314
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:870
Management Action 1 Week Ago:none
Present Management Action:August 7 to August 10 - End of first generation egg hatch.
Management Action for the Next 3 Weeks:August 17 - Second generation moth flight begins.August 20 to August 21 - Most larvae of the first generation are mature.August 28 to August 29 - Larval feeding of the first generation ends (most are now in the pupal stage).
For a current Obliquebanded Leafroller summary click here.
Peach Twig Borer
Biofix: June 7, 2025
Degree Days since Biofix:988
Moth Flight: 6.8% 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:none
Management Action for the Next 3 Weeks:August 18 to August 24 - 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, 2025
Degree Days since Biofix:1157
Males: 73.3% 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:August 31 to September 3 - 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:1403
Management Action 1 Week Ago:July 29 to July 30 - Continue servicing traps. Adult emergence of the 2nd generation of flies is peaking at this time.
Present Management Action:August 11 to August 12 - 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.
Peak egg-laying by 2nd generation flies is now occurring.
Management Action for the Next 3 Weeks:August 25 to 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, 2025
Degree Days since Biofix:2419
Management Action 1 Week Ago:July 30 - 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 9 - Females have begun egg-laying. They insert eggs inside the host nut or fruit.
Management Action for the Next 3 Weeks:August 17 - Egg hatch begins inside host nut or fruit.August 18 - 10% of adults have emerged.
For a current Walnut Husk Fly summary click here.
Western Cherry Fruit Fly
Biofix: Not established yet for 2025
Degree Days since March:2419
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.