Efficacy of Chlorantraniliprole Seed Treatments Against Armyworm (Mythimna unipuncta [Lepidoptera: Noctuidae]) Larvae on Corn (Zea mays)

Efficacy of Chlorantraniliprole Seed Treatments Against Armyworm (Mythimna unipuncta [Lepidoptera: Noctuidae]) Larvae on Corn (Zea mays)

Mythimna unipuncta (Haworth) (Lepidoptera: Noctuidae) is an important insect pest of corn (Zea mays L.) in North America and can cause severe damage during outbreaks. Insecticides are the main control method; however, development of insecticide resistance poses management challenges and necessitates...

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Bibliographic Details
Published in:Journal of economic entomology Vol. 112; no. 1; pp. 188 - 195
Main Authors: Carscallen, G. E., Kher, S. V., Evenden, M. L.
Format: Journal Article
Language:English
Published: US Entomological Society of America 12-02-2019
Oxford University Press
Subjects:
anthranilic
Bioassays
Cages
Corn
diamide
FIELD AND FORAGE CROPS
Insecticide resistance
Insecticides
Insects
Instars
Larvae
Lepidoptera
Management
Mortality
Noctuidae
Pest outbreaks
Pesticide resistance
Plant growth
ryanodine
Ryanodine receptors
Rynaxypyr
Seed treatments
Seeds
Thiamethoxam
Vegetables
Zea mays
ryanodine
Noctuidae
anthranilic
Rynaxypyr
diamide
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Summary:Mythimna unipuncta (Haworth) (Lepidoptera: Noctuidae) is an important insect pest of corn (Zea mays L.) in North America and can cause severe damage during outbreaks. Insecticides are the main control method; however, development of insecticide resistance poses management challenges and necessitates the use of novel insecticides. A synthetic insecticide, chlorantraniliprole, belonging to the anthranilic diamides, targets insect ryanodine receptors and is a potential alternative to conventional insecticides for management of M. unipuncta. We determined the efficacy of seed treatment with chlorantraniliprole alone compared with a positive control consisting of a neonicitinoid seed treatment of thiamethoxam and combinations of both compounds against M. unipuncta larvae in laboratory bioassays. Bioassays were conducted on two different growth stages of M. unipuncta larvae (instars 3 and 5) and two plant growth stages (V1 and V2 corn) in clip cages and whole plant experiments. Larval mortality, head capsule width, and feeding injury were measured.The chlorantraniliprole seed treatment alone or in combination with thimethoxam at different doses affected survival of M. unipuncta larvae. In all bioassays except one, larval mortality occurred earlier when a combination of chlorantraniliprole and thimethoxam seed treatment was used when compared with a thimethoxam alone seed treatment. Mythimna unipuncta larvae developed faster on the untreated control corn plants compared with corn with insecticide seed treatments. Foliar injury was low in both chlorantraniliprole alone and chlorantraniliprole + thimethoxam treatments compared with the control. Chlorantraniliprole thus offers potential alternative to conventionally used insecticides in the management of M. unipuncta in corn.
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ISSN:0022-0493
1938-291X
DOI:10.1093/jee/toy338