Acute-Contact and Chronic-Systemic In Vivo Bioassays: Regional Monitoring of Susceptibility to Thiamethoxam in Soybean Aphid (Hemiptera: Aphididae) Populations From the North Central United States

The risks associated with soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), in the North Central soybean systems has fostered the adoption of prophylactic chemical control practices, such as planting seeds treated with neonicotinoid insecticides, especially thiamethoxam. Consequently,...

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Bibliographic Details
Published in:Journal of economic entomology 2018-02, Vol.111 (1), p.337-347
Main Authors: de M. Ribeiro, Matheus G. P, Hunt, Thomas E, Siegfried, Blair D
Format: Article
Language:English
Subjects:
Animals
Aphididae
Aphids
Aphis glycines
Bioassays
Chemical control
Geography
Glycine max
Glycine max - growth & development
Hemiptera
in vivo bioassay
Insect Control
Insecticide resistance
INSECTICIDE RESISTANCE AND RESISTANCE MANAGEMENT
insecticide susceptibility
Insecticides
Leaves
Midwestern United States
Mortality
Neonicotinoids
Nitro Compounds
Oxazines
resistance monitoring
Seeds
soybean aphid
Soybeans
Thiamethoxam
Thiazoles
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Summary:The risks associated with soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), in the North Central soybean systems has fostered the adoption of prophylactic chemical control practices, such as planting seeds treated with neonicotinoid insecticides, especially thiamethoxam. Consequently, there is a concern that increased selection pressure imposed on the arthropod–pest complex by this insecticide may lead to resistance. Therefore, in vivo bioassays were conducted to determine the susceptibility of soybean aphid to thiamethoxam among North Central U.S. populations. Concentration-mortality data were collected using contact glass-vial and detached-leaf systemic bioassays.The results of these experiments indicate that both bioassays were reliable to detect shifts in susceptibility between different soybean aphid clones.The LC50s of field populations of soybean aphid were significantly different when mortality was recorded in contact and systemic exposure assays. Nevertheless, the magnitude of the resistance ratios was consistent in both methods. In addition, a significant increase in the LC50 and EC50 values was observed among field populations tested in detached-leaf systemic bioassays.These results represent the first extensive efforts to identify the variability in susceptibility of soybean aphid to thiamethoxam in the North Central United StatesTherefore, our results provide a baseline for future assessment and contribute to a better understanding of the applicability of in vivo bioassays for susceptibility monitoring and resistance detection of soybean aphid to thiamethoxam.
ISSN:0022-0493
1938-291X
DOI:10.1093/jee/tox290