Efficacy and residual toxicity of insecticides on plutella xylostella and their selectivity to the predator solenopsis saevissima.

Abstract: We evaluated the efficacy and residual toxicity of nine commercial insecticides on Plutella xylostella and their selectivity to the predator ant Solenopsis saevissima under laboratory and field conditions. First, to test the insecticides? effectiveness and selectivity, we conducted concentrationresponse bioassays on both species and the mortalities were recorded 48 h after exposure. Next, rapeseed plants were sprayed following label rate recommendations in the field. Finally, insecticidetreated leaves were removed from the field up to 20 days after application and both organisms were exposed to them as in the first experiment. Our concentration-response bioassay indicated that seven insecticides caused mortality ?80% of P. xylostella: bifenthrin, chlorfenapyr, chlorantraniliprole, cyantraniliprole, indoxacarb, spinetoram, and spinosad. However, only chlorantraniliprole and cyantraniliprole caused mortality ?30% of S. saevissima. The residual bioassay indicated that four insecticides had a long-lasting effect, causing mortality of 100% to P. xylostella 20 days after application: chlorantraniliprole, cyantraniliprole, spinetoram, and spinosad. For S. saevissima, bifenthrin caused mortality of 100% during the evaluated period. Additionally, mortality rates below 30% occurred four days after the application of spinetoram and spinosad. Thus, chlorantraniliprole and cyantraniliprole are safe options for P. xylostella management since their efficacy favor S. saevissima.

Bibliographic Details

Main Authors:	CARMO, D. G. do, COSTA, T. L., SANTANA JÚNIOR, P. A., SANTANA, W. C., MARSARO JUNIOR, A. L., PEREIRA, P. S., SANTOS, A. A., PICANÇO, M. C.
Other Authors:	DAIANE G. DO CARMO, Universidade Federal de Viçosa; THIAGO L. COSTA, Universidade Federal de Viçosa; PAULO A. SANTANA JÚNIOR, Universidade Federal de Viçosa; WEYDER C. SANTANA, Universidade Federal de Viçosa; ALBERTO LUIZ MARSARO JUNIOR, CNPT; POLIANA S. PEREIRA, Universidade Federal de Viçosa; ABRAÃO A. SANTOS, University of Florida; MARCELO C. PICANÇO, Universidade Federal de Viçosa.
Format:	Artigo de periódico biblioteca
Language:	Ingles English
Published:	2023-02-13
Subjects:	Diamondback moth, Controle Químico, Inseticida, Toxidez, Chemical control, Pesticide resistance, Brassica, Predators, Fire ants,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1151729
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