Insecticides for Control of Aphids in Wheat

Updated May 4, 2006 by Gary Hein and John Thomas

General Thresholds for Russian Wheat Aphid
Season Crop Stage Treatment Threshold Level
Fall Any growth stage 10% - 20% damaged plants
Spring Regrowth to Early Boot
Early Boot to Flowering
After Flowering		 5 - 10% damaged and infested tillers
10 - 20% damaged and infested tillers
more than 20% damaged and infested tillers

No. of Other Aphids per Stem to Justify Chemical Control
Type of Aphid Seedling
Stage		 Boot to
Heading Stage		 Flowering
Stage		 Milky Ripe
Stage		 Milk to Medium
Dough Stage
Greenbug 5 - 15 25 >25 >25 >25
Corn Leaf Aphid 20 30 >25 >25 >25
Birdcherry-Oat Aphid 20 30 >5 10 >10
English Grain Aphid 30 50 5 10 >10

This list is not inclusive. See http://www.greenbook.net or other resources for additional registrations.
This information is presented in abbreviated form. Be sure to consult the label for additional information and restrictions.

IRAC Mode of Action Classification:
  • Group 1 = Acetylcholine esterase inhibitors; 1B = Organophosphates
  • Group 2 = GABA-gated chloride channel antagonists; 2A = Cyclodiene organochlorines
  • Group 3 = Sodium channel modulators
  • Group 4 = Nicotinic acetylcholine receptor agonists/antagonists; 4A = Neonicotinoids
R = Restricted-Use Product * = Suitable for chemigation ai = active ingredient REI = Re-Entry Interval
Mode of
Action		Product
Name		Common
Name		RateRestrictions/Comments
3 R Baythroid 2* Cyfluthrin 1.8 - 2.4 oz/A Do not apply within 30 days of harvest or 7 days of grazing. REI 12 days.
1B R Di-Syston 15% G Disulfoton 1.67 oz/1000 ft
Up to 6.7 lbs/A		 Apply by drilling or broadcast at planting time. REI 48/72 hrs.
1B Dimethoate, Dimate
(Multiple Products)		 Dimethoate Up to 0.375 lb ai/A Do not apply within 35 days of harvest. REI 48 hrs.
1B R Lorsban 4E*,
Nufos 4E*		 Chlorpyrifos 0.5 - 1 pt/A Do not apply within 28 days of harvest. REI 24 hrs.
1B R Methyl 4EC Methyl Parathion 0.25 - 0.75 lbs ai/A Do not apply within 15 days of harvest. REI 5 days.
3 R Mustang Max Zeta-cypermethrin 3.2 - 4.0 oz/A Do not apply within 14 days of harvest. REI 12 hrs.
1B R Penncap-M Methyl Parathion 2 - 3 pts/A Do not apply within 15 days of harvest. REI 5 days.
3 R Proaxis Gamma-cyhalothrin 2.56 - 3.84 oz/A Do not apply within 30 days of harvest. REI 24 hrs.
2A R Thionex 3EC Endosulfan See label for rates. Do not apply after heads begin to form. REI 24 hrs.
3 R Warrior,*
generics		 Lambda-cyhalothrin 2.56 - 3.84 oz/A Do not apply within 30 days of harvest. REI 24 hrs.
SEED TREATMENTS
Mode of
Action		Product
Name		Common
Name		RateRestrictions/Comments
4A Cruiser 5FS Thiamethoxam 0.75 - 1.33 fl oz
per 100 lbs seed		 120-day plant-back interval for non-labeled crops.
4A Gaucho
(multiple formulations);
(Commercial Seed-Treaters Only)		 Imidacloprid 1 - 3 fl oz
per 100 lbs seed		 Grazing interval 45 days. 12-month plant-back interval for non-labeled crops.