Eficácia do benzoato de emamectina 5WG contra o complexo de podridão em grama vermelha
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O grão-de-bico é atacado por mais de 250 espécies de insectos, dos quais Helicoverpa armigera, Maruca vitrata e Etiella zinckenella são as pragas polifágicas mais importantes, tanto nas regiões tropicais como subtropicais, devido à sua extensa gama de hospedeiros, à sua capacidade de destruição e à sua distribuição no feijão-frade, no feijão-mungo, no feijão-urd e no feijão-comum. O benzoato de emamectina, que é um derivado semi-sintético da avermectina produzido como metabolitos de fermentação de actinomicetos do solo, Streptomyces avermitilis, tem uma ação estomacal e de contacto. Três rodadas de pulverização de benzoato de emamectina 5 WG @ 125 g/ha, com 10 dias de intervalo, começando 120 dias após o dibbling, foram eficazes na redução da população larval de H. armigera (5,81 nos./10 plantas; 84,26% e 4,93 nos./10 plantas; 85,67%), M. vitrata (4,52 nos./10 plantas; 85,00 e 4. 30 nos./10 plantas; 86,23%) e E. zinckenella (4,26 nos./10 plantas; 85,71 e 4,33 nos./10 plantas; 85,47%) em comparação com o controlo não tratado (38,11 e 36,85 nos./10 plantas; 30,85 e 33,74 nos./10 plantas e 30,22 e 31,11 nos./10 plantas) nas experiências de campo da primeira e segunda estação. Não tem efeito nocivo sobre parasitóides e predadores no ecossistema do grama-vermelha.
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