Helena MT - E5549
Data is up through June 18, 2026
Growing Degree Days since January 1:
Apple Maggot
Biofix: January 1, 2026
Degree Days since Biofix:958
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:June 29 to July 3 - Set out sticky trapsJuly 9 to July 10 - First emergence of adults. Begin sprays; continue at 5-14 day intervals until harvest
For a current Apple Maggot summary click here.
Billbugs
Biofix: January 13, 2026
Degree Days since Biofix:1531
Management Action 1 Week Ago:June 13 - 50% of billbug adults are active. If making a curative treatment(for example, neonicotinoid or pyrethroid), apply now.
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:557
Management Action 1 Week Ago:June 12 to June 16 - 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.
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 9, 2026
Degree Days since Biofix:335
Moth Flight: 66% of moths in 1st generation have emerged
Egg Hatch: 11.3% of moths in 1st generation have hatched.
Management Action 1 Week Ago:none
Present Management Action:June 17 - 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 18 - 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).
Make sure fruit is protected at least through the peak period, which ends at 640 degree days.June 18 - 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).
Management Action for the Next 3 Weeks:July 6 to July 7 - First Generation, end of peak egg hatch.
Egg hatch is waning for the first generation, and will be completely over by 925 degree days.
Egg hatch is waning for the first generation, and will be completely over by 925 degree days.
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: 738
Blight potential for today and next two days:
For a current Fire Blight summary click here.
4-day Risk Value: 738
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 | EXTREME | EXTREME |
Greater Peachtree Borer
Biofix: January 1, 2026
Degree Days since Biofix:559
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:July 8 to July 11 - If you are not using a pheromone trap to detect first moth emergence, start your trunk sprays now (if damage is present from previous year). Only treat the lower 12-18" of trunk and exposed roots, using permethrin, carbaryl, lambda-cyhalothrin, etc. Maintain protection through September.
For a current Greater Peachtree Borer summary click here.
Obliquebanded Leafroller
Biofix: Not established yet for 2026
Degree Days since March:937
Management Action 1 Week Ago:none
Present Management Action:June 22 to June 24 - First moths of the summer generation are expected.
Management Action for the Next 3 Weeks:June 24 to June 28 - First moths of the summer generation are expected.
For a current Obliquebanded Leafroller summary click here.
Peach Twig Borer
Biofix: June 4, 2026
Degree Days since Biofix:121
Moth Flight: 15.3% 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:none
Management Action for the Next 3 Weeks:June 29 to July 3 - Begin sprays for first 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 9, 2026
Degree Days since Biofix:315
Males: Adult Males is over for the season
Crawlers: 1% of crawlers in 1st generation have emerged.
Management Action 1 Week Ago:none
Present Management Action:June 24 - First generation crawlers are most active now. Spray once, using Esteem or 1% horticultural oil.
Management Action for the Next 3 Weeks:June 24 to June 27 - First generation crawlers are most active now. Spray once, using Esteem or 1% horticultural oil.
For a current San Jose Scale summary click here.
Spotted Wing Drosophila
Biofix: January 1, 2026
Degree Days since Biofix:564
Management Action 1 Week Ago:June 12 to June 13 - 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.
In addition, egg-laying on wild or early fruits by overwintering females is at its peak.
Present Management Action:June 17 to June 18 - 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.
Management Action for the Next 3 Weeks:June 30 - Continue servicing traps. Adult emergence of the 1st generation of flies is peaking at this time.July 12 to July 13 - Continue to keep fruit protected with insecticides if spotted wing has been confirmed on your fruit farm.
Peak egg-laying by 1st generation flies is now occurring.
Peak egg-laying by 1st generation flies is now occurring.
For a current Spotted Wing Drosophila summary click here.
Walnut Husk Fly
Biofix: January 1, 2026
Degree Days since Biofix:1210
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:July 4 - Hang yellow sticky traps.July 13 to July 14 - First adult emergence. If using spinosad or GF-120, start applications now and continue until harvest (apricot, peach) or until one month before harvest (walnut).
For a current Walnut Husk Fly summary click here.
Western Cherry Fruit Fly
Biofix: Not established yet for 2026
Degree Days since March:1210
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.
