Helena MT - E5549
Data is up through May 23, 2024
Growing Degree Days since January 1:
Change Station:
Apple Maggot
Biofix: January 1, 2024
Degree Days since Biofix:452
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, 2024
Degree Days since Biofix:812
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:June 1 - 30% of adult billbugs are present. If making a preventive treatment (for example, neonicotinoids, anthranilic diamides, or pyrethroids), apply now.

June 19 - 50% of billbug adults are active. If making a curative treatment(for example, neonicotinoid or pyrethroid), apply now.
For a current Billbugs summary click here.
Cereal Leaf Beetle
Biofix: May 6, 2024
Degree Days since Biofix:166
Management Action 1 Week Ago:May 18 to May 22 - Peak CLB egg numbers occur on small grain foliage.

Early scouting now can identify fields that could be at risk of significant CLB damage this year.

It is too early to take control action, however (instead, scouting should be repeated at 325).
Present Management Action:none
Management Action for the Next 3 Weeks:June 3 - Overall field populations of CLB now include approximately 50% eggs and 50% larvae. <br><br>Now is an excellent time to sample to determine whether there will be need for control (see CLB Utah Pests Fact Sheet). <br><br>If control needed, it is best if possible to apply between 400 and 450 DD rather than earlier (to minimize harm to biological control of CLB by parasitic wasps).

June 9 to June 10 - If needed, apply control (see CLB Utah Pests Fact Sheet)

June 13 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.
For a current Cereal Leaf Beetle summary click here.
Codling Moth - Trap Biofix
Biofix: May 14, 2024
Degree Days since Biofix:49
Moth Flight: 5.4% of moths in 1st generation have emerged
Egg Hatch: Egg Hatch is over for the season
Management Action 1 Week Ago:May 15 - Hang mating disruption dispensers (where applicable) before biofix (which typically occurs during full bloom of Red Delicious).

Use pheromone monitoring traps with CM-DA lure.
Present Management Action:none
Management Action for the Next 3 Weeks:June 8 - Optional management strategy for First Generation.

Apply horticultural oil to smother eggs that have been laid up to this point. Good coverage is essential.

The next spray will not be applied until the date that corresponds to 350 degree days.

June 10 - Egg hatch for first generation begins.

Apply the first insecticide application (Delegate, Altacor, Assail, Belt, Intrepid, etc.) and continue every 14-21 days until the end of first generation egg hatch, which corresponds to the date at 920 degree days (typically 2-3 additional sprays depending on temperatures).

June 19 - 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 20 - 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).
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: 0
Blight potential for today and next two days:
Condition Today Tomorrow Next Day
If blight was in your orchard last year LOW LOW LOW
If blight was only nearby last year LOW LOW LOW
If no blight last year LOW LOW LOW
For a current Fire Blight summary click here.
Greater Peachtree Borer
Biofix: January 1, 2024
Degree Days since Biofix:243
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:June 10 to June 12 - Hang pheromone trap to monitor for first flight of this clearwing moth.
For a current Greater Peachtree Borer summary click here.
Obliquebanded Leafroller
Biofix: Not established yet for 2024
Degree Days since March:476
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:May 31 to June 7 - Hang pheromone trap in orchard.
For a current Obliquebanded Leafroller summary click here.
Peach Twig Borer
Biofix: Not established yet for 2024
Degree Days since March:241
Management Action 1 Week Ago:none
Present Management Action:May 30 - Place pheromone trap in orchard to get biofix (first moth flight)
Management Action for the Next 3 Weeks:May 30 - Place pheromone trap in orchard to get biofix (first moth flight)

June 9 to June 13 - First moths expected
For a current Peach Twig Borer summary click here.
San Jose Scale
Biofix: May 14, 2024
Degree Days since Biofix:42
Males: 53.6% 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, 2024
Degree Days since Biofix:243
Management Action 1 Week Ago:none
Present Management Action:none
Management Action for the Next 3 Weeks:June 18 - 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.
For a current Spotted Wing Drosophila summary click here.
Walnut Husk Fly
Biofix: January 1, 2024
Degree Days since Biofix:597
Management Action 1 Week Ago:none
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 2024
Degree Days since March:597
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.