Seletividade e distúrbios locomotores no percevejo Blaptostethus pallescens predador de Chrysodeixis includens causados por exposição a inseticidas

• Autor(a) principal: Ramos, Rodrigo Soares
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/4629
• topic: Inseticidas; Pragas - Manejo; Comportamento animal; Insecticides; Pests - Management; Animal behavior; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA

In the integrated pest management programs is important the selection of efficient insecticides for the pest control and with low impact on natural enemies. The soybean looper, Chrysodeixis includens (Walker) (Lepidoptera: Noctuidae) is an important pest of soybeans, beans, cotton, potatoes, tomatoes, sunflower and tobacco in various parts of the world. The pirate bugs from the Anthocoridae family are important predators of eggs and larvae in agroecosystems. Among these predators, Blaptostethus pallescens (Poppius) is an important species and little-studied. The aims of this study were to determine the selectivity of insecticides in relation to C. includens its prey, the possible biochemical mechanisms of physiological selectivity in favor of B. pallescens and changes in the locomotion behavior of the predator caused by pesticides. The cartap, clorantraniliprole, chlorfenapyr, spinosad, indoxacarb, methomyl, flubendiamide and deltamethrin insecticides showed higher mortality than 80% of C. includens larvae. Spinosad, methomyl and cartap were insecticides that controlled more quickly C. includens (less than 5 hours). Clorantraniliprole, chlorfenapyr, spinosad, indoxacarb and flubendiamide were selective to the pirate bug predator B. pallescens. The monooxygenases enzymes are possibly involved in the selectivity of chlorfenapyr, spinosad and indoxacarb. The transferases enzymes are possibly involved in the selectivity of chlorfenapyr, indoxacarb and flubendiamide. The esterase enzymes are possibly involved in the selectivity of chlorfenapyr to the predator B. pallescens. Flubendiamide had effect of attraction on B. pallescens. Cartap, indoxacarb and spinosad have had repellency effect over this predator. Thus, the results of this study reinforce the importance of using more selective compounds as chlorfenapyr, spinosad, indoxacarb and flubendiamide or also by compounds with high specificity as clorantraniliprole due to lower toxicity to non-target organisms which gives the possibility of more sustainable IPM programs of C. includens.