Data/hora: 16/06/2024 06:20:33

Provedor de dados: | 91
País: | Brazil
Título: | Biological activity and persistence of pirimiphos-methyl applied to maize grain at different temperatures
Autores: | Silveira,Rodrigo D.; Faroni,Lêda R. A.; Guedes,Raul N. C.; Queiroz,Maria E. L. R.; Pimentel,Marco A. G.
Data: | 2009-12-01
Ano: | 2009
Palavras-chave: | Sitophilus zeamais; Tribolium castaneum; Organophosphate; Residue; Insect control.
Resumo: | The expansion of dryeration may impose a further problem for insect control with protectants - the high grain temperatures during insecticide spraying. To assess the impact of this procedure on insecticide activity, maize grains at different temperatures (25, 30, 35, 40 and 45 °C) were sprayed with pirimiphos-methyl. Residue analyses were carried out every 30 days and insecticide biological activity towards Sitophilus zeamais and Tribolium castaneum was assessed every 15 days throughout the experimental period of 90 days. Insect mortality was evaluated after 48 h. Pirimiphos-methyl residue decreased with increased storage time and grain temperature during spraying. Similar trends were also observed for mortality of S. zeamais and T. castaneum, which dropped from around 100% for lower grain temperatures, shortly after spraying, to mortality values around 0% for higher temperatures and after 90 days of storage. These results indicate the drastic effect of grain temperatures during spraying, which compromises the efficiency of grain protectants for insect pest control on stored grains.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662009000600010
Editor: | Departamento de Engenharia Agrícola  - UFCG
Relação: | 10.1590/S1415-43662009000600010
Formato: | text/html
Fonte: | Revista Brasileira de Engenharia Agrícola e Ambiental  v.13 n.6 2009
Fonte: | info:eu-repo/semantics/openAccess