Enhanced toxicity of Cry2Ab with cantharidin and its analogues on Mythimna separata

The oriental armyworm, Mythimna separata Walker (Lepidoptera: Noctuidae), is a severe pest of graminaceous crops in Asia and Australia. In this study, we investigated the impacts of Cry2Ab, cantharidin and its analogues (cantharidin‐23 and cantharidin‐24) on M. separata growth, hydrolytic enzymes an...

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Bibliographic Details
Published in:Journal of applied entomology (1986) 2017-06, Vol.141 (5), p.363-371
Main Authors: Fan, J. B., Velde, S., Sun, W. B., Yu, H., Zhang, Y. L., Wang, D.
Format: Article
Language:English
Subjects:
Acid phosphatase
Alkaline phosphatase
cantharidin
Chemical pest control
Cry2Ab
Developmental stages
enzyme activity
Enzymes
Glutathione
Larvae
Mythimna separata
Phosphatase
Toxicity
weight
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Summary:The oriental armyworm, Mythimna separata Walker (Lepidoptera: Noctuidae), is a severe pest of graminaceous crops in Asia and Australia. In this study, we investigated the impacts of Cry2Ab, cantharidin and its analogues (cantharidin‐23 and cantharidin‐24) on M. separata growth, hydrolytic enzymes and detoxifying enzymes. Differences in weight gain and enzyme activities among all treatments were observed. Larval and pupal weight gain and hydrolytic enzyme activities declined when larvae were treated with Cry2Ab, cantharidin and its analogues, individually or in combination. The combination of Cry2Ab and cantharidin or cantharidin‐24 had a markedly adverse effect on larval weight gain. Alkaline phosphatase and acid phosphatase were inhibited, whereas glutathione S‐transferase was upregulated in all treatments with sublethal doses. The maximum reduction in alkaline phosphatase activity and increase in glutathione S‐transferase activity occurred after the larvae were treated with a combination of Cry2Ab and cantharidin‐24 over 48 h. The results suggest that the compositions of Cry2Ab, cantharidin and cantharidin‐24 have a potential use in pest management.
ISSN:0931-2048
1439-0418
DOI:10.1111/jen.12359