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Alfalfa - Recommended insecticides for armyworm, cutworm, and earworm control

Armyworm, Cutworm, and Corn Earworm

Sampling/Decisionmaking.

True armyworms and various cutworms may damage small plants during early spring and reduce the yield of the first cutting. Infestations of fall armyworms and earworms are more likely to occur in late summer to early fall. These caterpillars are more difficult to control. Seedling stands suffer the most damage. Treatment is suggested when there are two or more larvae per square foot in seedling fields or five or more larvae per square foot in established fields.

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Insecticide and formulation Rate of active ingredient per acre Rate of formulation per acre Time lmits: Days before harvest Remarks
carbaryl
(Sevin XLR Plus)
1-1.5 qts. 7
beta-cyfluthrin
(Baythroid XL)
0.0125-0.022 lb 1.6-2.8 oz 7 Restricted Use: Armyworm – first and second instar.
indoxacarb
(Steward EC)
0.09-0.11 lb 9.2-11.3 oz 7
lambdacyhalothrin
(Lambda-Cy 1EC)
0.02-0.03 lb 2.56-3.84 oz 1 for forage, 7 for hay Restricted Use:
lambdacyhalothrin
(Warrior II)
0.02-0.03 lb 1.28-1.92 oz 1 for forage, 7 for hay Restricted Use:
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College of Agriculture and Natural Resources
University of Maryland

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