Eficiência de produtos vegetais no controle da lagarta-do-cartucho-do-milho Spodoptera frugiperda (J.E.Smith, 1797) (Lepidoptera: Noctuidae)

Abstract

The objective of this work was to study the efficiency of vegetable pesticides in the control of Spodoptera frugiperda (J.E.Smith, 1797) in corn culture. The experiments were installed, in the years of 2002 and 2004, with the spraying of the vegetable products in five treatments, and four repetitions. In the year of 2002 the tested products were: Azadirachta indica A. Juss (aqueous extract 2%), and oil at 1%; Melia azedarach L. (aqueous extract 2%); Quassia amara L. (aqueous extract 2%); nim oil, Azadirachta indica 1 and 2%. In the year of 2004 the tested products were: A. indica (aqueous extract 5%), and oil at 2%, M. azedarach (aqueous extract 5%), Trichilia pallida Sw. (aqueous extract 5%). The evaluations like percentage of infestation of the fall armyworm per plot, were made three, seven and ten days after the extracts application respectively. It was possible to verify that aqueous extracts of the plants A. indica 2%, T. pallida 5%, Q. amara 2% and M. azedarach 2% and 5% and A. indica oil 1% and 2% with addition of non ionic active tense, don't possess necessary efficiency as the only control method of the fall armyworm S. frugiperda in field conditions. The products begin to affect the development of fall armyworms some days after the ingestion of the powdered leaves, observed in the seven days after the extracts application.