Resistência a inseticidas e falhas no controle de Tuta absoluta

• Ano de defesa: 2009
• Autor(a) principal: Silva, Gerson Adriano
• Orientador(a): Picanço, Marcelo Coutinho
• Banca de defesa: Ferreira, João Alfredo Marinho , Lúcia, Terezinha Maria Castro Della
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Entomologia
• Departamento: Ciência entomológica; Tecnologia entomológica
• País: BR
• Palavras-chave em Português: Resistência a inseticidas; Tuta absoluta; Inseticidas neurotóxicos; Inseticidas reguladores do crescimento
• Palavras-chave em Inglês: Insecticide resistance; Tuta absoluta; Neurotoxic insecticides; Growth regulator insecticides
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOSSANIDADE::ENTOMOLOGIA AGRICOLA
• Link de acesso: http://locus.ufv.br/handle/123456789/3882

The Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) is the most important pest of tomato Lycopersicon esculentum Mill in Brazil. Their larvae consume the leaf mesophyll, attack stems, flowers and fruits of tomato, reducing the productivity of this culture and consequently the profitability of farmers. For reducing this insect attack, farmers use insecticides intensively, and often the efficacy control is not reached as desired. One possible reason for the low efficiency is the resistance development to insecticides in populations of this insect. Therefore, tomato producers need search for detecting and monitoring of the T. absolute populations resistance to insecticides. The objective of this study was identified resistance to insecticides in T. absoluta populations from major regions tomato producing of Brazil, and verified the control failures of this pest. The populations were from Cerrado, Southeast and Northeast of Brazil. Ten insecticides were used, six neurotoxic, three insects growth regulators and one which has the bacterium Bacillus thuringiensis as active ingredient. In populations from Cerrado and Southeast the abamectin, spinosad, deltamethrin, triazophos, indoxacarb and bifenthrin were in ascending order, the insecticides that showed the lowest level of resistance among the products tested. In Northeast s population the same resistance was observed, except for bifenthrin, which was replaced by teflubenzurom. The insecticides diflubenzurom, permethrin, triflumurom and the B. Thuringiensis had larger numbers of resistant populations to insecticides in all regions. The T. absoluta population from Viçosa-MG is the most appropriate to be used as susceptibility pattern in resistance study to insecticides of this pest. In recommended doses by industries, the abamectin, spinosad, deltamethrin and triazophos insecticides had not control failures of the T. absolute populations, while the bifenthrin has control failures of populations from Uberlândia, Paulínea and Camocim de São Felix, the indoxacarb had control failures of populations from Uberlândia, São João da Barra and Viçosa, teflubenzurom had control failures of populations from Goianápolis, São João da Barra, Viçosa and Santa Tereza, diflubenzurom, permethrin, triflumurom and B. thuringiensis had control failures in all the T absolute populations which were tested. The correct management of this pest, through the practices which contribute for increasing of control efficacy, can help prevent, delay or reverse the resistance development of this insect pest to insecticides.