Abstract:P lutella xylostella (L.) (Lep.:Plutellidae), comumente conhecida como traça-das-crucíferas, é considerada a principal praga das plantas da família Brassicacea no Brasil e no mundo (Talekar e Shelton, 1993). Seu ciclo de vida é muito influenciado pela temperatura, podendo haver até 15 gerações por ano. A 15 0 C o ciclo se completa em 28 dias, ao passo que a 35 0 C o mesmo se reduz para 11 dias (Ho, 1965; Balachowsky, 1966; Ooi e Kelderman, 1979). Durante o verão, a precipitação reduz o número de ovos das fol… 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.…”
Section: Discussionmentioning
confidence: 99%
“…The chemical method has been used intensively not only to control P. xylostella but also to control other pests, with several sprays in one growing season, which have resulted in applicator intoxication . Besides the side effects inherent to insecticides, such as high residues left in the environment, many sprays of chemical insecticides have caused rapid selection of P. xylostella to resistance …”
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.…”
Section: Discussionmentioning
confidence: 99%
“…The chemical method has been used intensively not only to control P. xylostella but also to control other pests, with several sprays in one growing season, which have resulted in applicator intoxication . Besides the side effects inherent to insecticides, such as high residues left in the environment, many sprays of chemical insecticides have caused rapid selection of P. xylostella to resistance …”
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.
“…Bioinsecticides based on B. thuringiensis are commercially produced since 1970 and at present represent over 90% of the market for biological products for pest control (DIAS et al, 2004).…”
Plutella xylostella L. is the most important worldwide pest of cruciferous plants and indiscriminate use of insecticides has led to the resistance of the species to different groups. This research was conducted to compare the toxicity and persistence of two strains of
RESUMO
Larvas de Plutella xylostella L. são as principais pragas de crucíferas cultivadas e o uso excessivo e indiscriminado de inseticidas tem levado a resistência da espécie para diferentes grupos de inseticidas. Este trabalho foi conduzido para comparar a toxicidade de duas formulações de
Palavras-chave:traça-das-crucíferas, bioinseticida, entomopatógenos, persistência residual.
“…Trata-se de uma praga encontrada em todas as regiões produtoras de Brassicaceae no mundo, independente das condições climáticas (DIAS et al, 2004;MAU & KESSING, 2015), tendo como local de origem à Europa Mediterrânea (TALEKAR & SHELTON, 1993;CASTELO BRANCO & FRANÇA, 2001;DIAS et al, 2004).…”
Aos meus pais Olímpia Gomes da Rocha Silva e Jerônimo Marciano da Silva; à minha filha Daniele da Silva Ramalho; ao meu marido Daniel Inácio Ramalho; ao meu irmão João Carlos Alves da Rocha; e à minha cunhada Circe da Rocha que são minha estrutura familiar e emocional. À Faculdade de Filosofia Ciências e Letras de Ribeirão Preto/USP, pela oportunidade de realizar o doutorado e pelo excelente Programa de Pós Graduação em Entomologia, no qual tenho certeza que adquiri muita bagagem para continuar minha caminhada. À Faculdade de Ciências Agrárias e Veterinárias, Campus de Jaboticabal/UNESP, e ao Departamento de Fitossanidade, onde realizei toda a maior parte da fase experimental da tese. Ao Conselho Nacional de Pesquisa (CNPq), pela concessão da bolsa de estudos. Ao Prof. Dr. Sergio Antonio De Bortoli, por ter sido meu pai na ciência, pelo respeito e pelos conhecimentos transmitidos ao longo desta caminhada, e nenhuma palavra seria o bastante para agradecer. Ao Dr. Diego da Silva Bastos, pela dedicação em me ajudar nesse mundo ímpar da Ecologia Química e paciência em me ajudar. À Prof. Dra. Alessandra Marieli Vacari, que foi minha mãe na Ciência, sendo que a única palavra que pode expressar o que sempre sentirei por você é gratidão; pela amizade; pelos ensinamentos; e pelo exemplo de pessoa.
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