Produção, persistência e eficiência da pulverização eletrostática de Isaria javanica no manejo de Bemisia tabaci

• Autor(a) principal: Figueiredo, Lara Leal
• Data de Publicação: 2018
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/0013000003qs8
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/8641
• topic: Controle biológico; Fungo entomopategênico; Mosca-branca; Entomopathogenic fungi; Whitefly; Biological control; AGRONOMIA::FITOSSANIDADE

The whitefly, Bemisia tabaci (Gennadius, 1889), is an insect that has great importance in world agriculture. It adapts easily to diverse cultures and environments, thus, making it difficult to handle. The use of the entomopathogenic fungus Isaria javanica is considered a promising tactic for the management of whitefly. The objectives of this work were to select isolates of I. javanica with higher conidia production in solid medium; to evaluate the efficiency of different methods of entomopathogenic fungus application on whitefly nymphs; quantify the number of conidia deposited on the abaxial face of the bean leaves and evaluate the persistence of the conidia in the environment. To evaluate the production of conidia, three isolates of I. javanica were used and placed in Erlenmeyer containing 200 grams of parboiled rice. The isolate CNPAF 14 presented the highest yield of conidia (1.20 x 1010 conidia / gram of rice). In the evaluation of the efficiency of different spraying methods, the electrostatic sprayer, CO2 and Air brsuh were used. Bean plants were grown in pots in the greenhouse and infested with white-fly adults for nymphs. Bean plants with 2nd instar nymphs were sprayed with Tween 80® solution [0.05%], suspension of fungus I. javanica [1x107 conidia.mL -1 ] and spiromesifene 0.5 L / ha. The methods of electrostatic spraying and CO2 did not show differences in the mortality of whitefly nymphs. To evaluate the deposition and the persistence of conidia was used the isolate CNPAF 14 [5x106 conidia.mL -1 ]. Suspension was applied with the electrostatic sprayer and CO2 in the potted bean plants in the greenhouse. The spraying methods did not increase the amount of conidia deposited on the abaxial face of the bean leaves and did not interfere in the persistence. Future studies should be conducted to enable commercial production of the entomopathogenic fungus I. javanica to assist in the management of B. tabaci.