Insect Control

Insect Control & Insecticide Use Precautions (PDF, 24 KB)

Please select an insect to learn more about methods of treatment, products available, and rate of application.

Aphids

Seed treatments provide early season control of aphids and barley yellow dwarf. Seed treatments also suppress Hessian fly, but may not control heavy infestations. For Hessian fly suppression 1.6 fl oz / 100lb Gaucho 600 or 1.33 fl oz / 100lb Cruiser is recommended.

Aphid treatments are most likely to be profitable on early-planted high-yield-potential wheat (60+ bu/ac). The key pest is the oat-bird cherry aphid which is the major vector or carrier of barley yellow dwarf virus.

This aphid typically has a dark green body with reddish area on the “rear end”. Treatment is recommended on high yield wheat if you find 8 oat-bird cherry aphids per row foot prior to jointing.

Karate and Warrior are superior to other foliar aphid treatments for suppression of barley yellow dwarf virus under SC conditions. Applying these products with topdress N to wheat in early February will prevent most virus transmission under SC conditions.

Oats are more susceptible to barley yellow dwarf than wheat but none of the effective foliar aphid treatments are labeled on oats. Gaucho seed treatment can be used on oats.

English grain aphids (light green bodies with long black “exhaust pipes” protruding upward from rear end) increase during jointing and move to heads as they emerge in April. The treatment guideline for English grain aphid is 2-3/stem during jointing; 5/stem at head emergence to blooming; 10/stem at milk; dough stage is too late to spray. Return to top.

Product Rate/Acre
Seed Treatements
Gaucho 600
0.8 fl oz / 100 lb
Gaucho XT
3.4 fl oz / 100 lb
Cruiser 5FS
1.0 fl oz / 100 lb
Foliar
Karate Z & Warrior II 1.3 – 1.9 oz
(1 gal / 100-66 ac)
Warrior 1EC 2.6 – 3.8 oz
(1gal /50-33 ac)
Baythroid XL 1EC
2.4 fl oz
(1 gal / 53 ac)
Proaxis 0.5 2.6 – 3.8 fl oz
(1 gal / 49-33 ac)

Armyworms

Treat when armyworm populations reach 2 per drill ft. True armyworm infestations usually occur after flag leaf emergence. Return to top.

Product Rate/Acre
Baythroid XL 1 EC
1.8 – 2.4 fl oz
Sevin 80S
1.75 lb
Sevin XLR
1.5 qt
Sevin 4F 1.5 qt
Karate1
1.9 oz
Warrior II1
1.9 oz
Warrior 1EC1 3.8 oz
Lannate LV
1.5 pt
Lannate 90 SP 0.5 lb
Mustang MAX 0.8 EC 3.2 oz
Proaxis 0.5 3.2 fl oz

1. Karate or Warrior also provide season-long aphid control.

Fall Armyworms

Treat if the stand is threatened before frost. Fall armyworm infestations may occur on early planted seedling stage small grain. Return to top.

Product Rate/Acre
Sevin 80S
1.75 lb
Sevin XLR
1.5 qt
Sevin 4F
1.5 qt
Karate
1.9 oz
Warrior II
1.9 oz
Warrior 1EC
3.8 oz
Lannate LV
1.5 pt
Lannate 90 SP
0.5 lb
Proaxis 0.5 3.2 fl oz

Cereal Leaf Beetles

Cereal leaf beetles first hatch out in March and peak feeding occurs in April. Treat if you have 1 larva on every other stem (average of 0.5 larvae / stem). Return to top.

Product Rate/Acre
Baythroid XL
1.0 – 1.8 fl oz
Malathion 57 EC
1.5 pt
Malathion 5EC
1.5 pt
Malathion 8EC
1 pt
Karate1
1.3 - 1.9 oz
Warrior II1 1.3 - 1.9 oz
Warrior 1EC1 2.6 - 3.8 oz
Mustang MAX 0.8 EC
2.6 - 3.2 oz
Proaxis 0.5 2.6 – 3.8 fl oz

1. Karate or Warrior also provide season-long aphid control.

Grasshoppers

Grasshoppers typically attack wheat after flag leaf emergence. There are no well established thresholds for grasshopper treatment. Prevent flag leaf defoliation. Return to top.

Product Rate/Acre
Baythroid XL

2.4 fl oz
Sevin 80S
1.25-1.75 lb
Sevin XLR
1.0-1.5 qt
Sevin 4F
1.0-1.5 qt
Karate
1.9 oz
Warrior II
1.9 oz
Warrior T 1EC
3.8 oz
Malathion 8 EC
1.25 pt
Malathion 57 EC
2.0 pt
Methyl Parathion 4 EC
1 pt
Penncap-M
2-3 pt
Mustang MAX 0.8 EC
3.2 – 4.0 oz
Proaxis 0.5 3.8 fl oz

Hessian Flies

Varietal resistance is the most economical way to manage Hessian fly. HF resistance declines over time and varies by location depending on the predominant races of Hessian fly present. Treat susceptible varieties on farms with a history of economic damage. Proximity to wheat stubble from previous crop increases HF risk. Wheat planted in the coastal plain before 15 Nov is most susceptible to HF. Oats are immune to Hessian fly.

Seed treatments will suppress but not control Hessian fly.  Seed treatments also provide early season control of aphids and barley yellow dwarf. Gaucho XT also controls smut and certain seedling diseases, but only has one-half the insecticide active ingredient of the 1.6 oz rate of Gaucho 600. Adding 0.8 oz Gaucho 600 to Gaucho XT gives the same level of a.i. as 1.6 oz Gaucho 600.

Foliar treatment at early post emergence (2-4 leaf stage) may reduce fall infestation on susceptible varieties. March treatment (jointing) may reduce spring infestations. Control with either timing is erratic. Return to top.

Product Rate/Acre
Seed Treatment

Gaucho 600
1.6 fl oz/100 lb
Gaucho XT
3.4 fl oz/100 lb
Cruiser 5FS
1.33 fl oz/100 lb
Gaucho XT +
3.4 fl oz +
Gaucho 600
0.8 fl oz / 100 lb
Foliar

Karate
1.9 oz
Warrior II
1.9 oz
Warrior 1EC 3.8 oz