Abstract:Avaliou-se em dois experimentos a suscetibilidade da traça-das-crucíferas a inseticidas à base de Bacillus thuringiensis em repolho cv. Itiban. O delineamento do primeiro experimento (de julho a setembro/03), em área de plantio comercial em Brazlândia (DF), foi de blocos casualizados, com seis tratamentos e dez repetições; os bioinseticidas utilizados foram B. thuringiensis kurstaki (S1450CO), B. thuringiensis aizawai comercial (Bta) e três produtos formulados com as estirpes S1450BB, S811BB, S845BB de B. thur… Show more
“…Insect resistance to microbial‐based insecticides is of particular concern in Brazil because it may impair the control of pests not only in conventional crops but also on organic farms, where these insecticides represent an important tool for pest management. Although efficacy studies of Bt ‐based products towards P. xylostella have been carried out in Brazil, this is the first time that such a susceptibility survey has been done with Brazilian populations of P. xylostella with regard to the evolution of resistance to Bt ‐based products and behavioural responses.…”
Broad and indiscriminate use of Bt-based products has selected Brazilian P. xylostella populations to resistance. Larval movement appears to be a resistance-independent mechanism. Most populations of P. xylostella preferred to lay eggs on Bt-free surfaces, which might be a result of growers' practice of spraying the cabbage head. Reduced oviposition on treated surfaces correlated with physiological resistance, suggesting a behavioural response among the Bt-resistant colonies to Dipel®WP.
“…Insect resistance to microbial‐based insecticides is of particular concern in Brazil because it may impair the control of pests not only in conventional crops but also on organic farms, where these insecticides represent an important tool for pest management. Although efficacy studies of Bt ‐based products towards P. xylostella have been carried out in Brazil, this is the first time that such a susceptibility survey has been done with Brazilian populations of P. xylostella with regard to the evolution of resistance to Bt ‐based products and behavioural responses.…”
Broad and indiscriminate use of Bt-based products has selected Brazilian P. xylostella populations to resistance. Larval movement appears to be a resistance-independent mechanism. Most populations of P. xylostella preferred to lay eggs on Bt-free surfaces, which might be a result of growers' practice of spraying the cabbage head. Reduced oviposition on treated surfaces correlated with physiological resistance, suggesting a behavioural response among the Bt-resistant colonies to Dipel®WP.
“…The occurrence of P. xylostella populations of resistant to certain active ingredients, like synthetic and biological insecticides, has caused a considerable increase in research directed at developing tactics for Integrated Pest Control based on economic, social, and ecological parameters [21,[45][46][47].…”
“…Além disso, a letalidade da bactéria não atinge parasitoides de P. xylostella, tornando-a indicada para o uso em programas de manejo integrado deste inseto (MONNERAT et al, 2000). No entanto, diferentes estirpes de B. thuringiensis não agem com o mesmo potencial de controle, necessitando realizar avaliações de diferentes cepas (MEDEIROS et al, 2006).…”
Direitos para esta edição cedidos à Atena Editora pelos autores.Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição 4.0 Internacional (CC BY 4.0). O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores, inclusive não representam necessariamente a posição oficial da Atena Editora. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais.A Atena Editora não se responsabiliza por eventuais mudanças ocorridas nos endereços convencionais ou eletrônicos citados nesta obra.Todos os manuscritos foram previamente submetidos à avaliação cega pelos pares, membros do Conselho Editorial desta Editora, tendo sido aprovados para a publicação.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.