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Avaliou-se a atividade inibidora de alimentacao de plantas nativas do Mato Grosso do Sul, utilizando lagartas dos insetos-pragas Spodoptera frugiperda e Anticarsia gemmatalis como organismos testes. Para os bioensaios foram preparados extratos alcoolicos pelo metodo da percolacao, que apos diluicao foram aplicados em discos de folhas de milho ou de soja. Com os resultados das areas consumidas foram calculados os indices de inibicao alimentar. As especies de plantas que apresentaram alguma atividade foram Agonandra brasiliensis, Ocotea suaveolens, Annona dioica e Machaerium hirtum (a mais ativa). Analises de grupos quimicos presentes nas especies mais ativas apontam a presenca de saponinas, alcaloides, cumarinas ou flavonoides. EVALUATION OF PLANTS WITH ANTIFEEDANT ACTIVITY IN Spodoptera frugiperda (J.E. SMITH) AND Anticarsia gemmatalis HUBNER Abstract The antifeedant activity of native plants from Mato Grosso do Sul against caterpillars and phytophagous insects Spodoptera frugiperda and Anticarsia gemmatalis with test organisms was evaluated. For the bioassays alcoholic extracts were prepared by the percolation method which after dilution where applied on discs of corn and soya leaves. With the results of consumed areas the antifeeding index were calculated. The plant species that presented some activity were Agonandra brasiliensis, Ocotea suaveolens, Annona dioica and Machaerium hirtum (the most active). Chemical group analysis presented in the most active species revealed the presence of saponins, alkaloids, cumarins or flavonoids.

AVALIAÇÃO DE PLANTAS COM ATIVIDADE DETERRENTE ALIMENTAR EM Spodoptera frugiperda (J.E.SMITH) E Anticarsia gemmatalis HUBNER