Data/hora: 12/06/2024 10:32:55

Provedor de dados: 	86	
País: 	Brazil	
Título: 	Toxicity of pymetrozine and thiamethoxam to Aphelinus gossypii and Delphastus pusillus	
Autores: 	Torres,Jorge Braz; Silva-Torres,Christian Sherley Araujo; Oliveira,José Vargas de.	
Data: 	2003-04-01	
Ano: 	2003	
Palavras-chave: 	Gossypium; Infestation; Parasitoids; Insecticide selectivity.	
Resumo: 	The objective of this work was to study the toxicity of pymetrozine and thiamethoxam to the cotton aphid parasitoid Aphelinus gossypii Timberlake and to the whitefly predator Delphastus pusillus (LeConte). Cotton leaves containing mummies of the parasitoid A. gossypii were collected and treated with seven concentrations of both insecticides. Parasitoid emergence was not affected by pymetrozine and ranged from 59.9% to 75.0%, but decreased with the increase of thiamethoxam concentrations ranging from 30.2% to 69.6%. Cotton leaves infested by whitefly and treated with recommended rates of both insecticides were collected three hours, three days and six days after spraying and colonized with larvae and adults of D. pusillus. Predators released on thiamethoxam-treated leaves experienced mortality from 70% to 100%, while those released on pymetrozine-treated leaves showed mortality from 0% to 20%. Topical toxicity from both insecticides was studied on larvae, pupae and adults of D. pusillus. The survival of predator after six days of exposure to 400, 600 and 800 mg/L of pymetrozine a.i. was higher than 69.6%, and to 25, 100 and 200 mg/L of thiamethoxam a.i. was lower than 8.7%. The toxicity data for A. gossypii and D. pusillus characterize the pymetrozine as harmless for both species, and thiamethoxam of low to moderate toxicity for A. gossypii treated mummies, and high toxicity for D. pusillus.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000400003	
Editor: 	Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira	
Relação: 	10.1590/S0100-204X2003000400003	
Formato: 	text/html	
Fonte: 	Pesquisa Agropecuária Brasileira  v.38 n.4 2003	
Fonte: 	info:eu-repo/semantics/openAccess