Suscetibilidade de Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) a entomopatógenos
Carregando...
Arquivos
Data
2014-07-22
Autores
Agostini, Lucas Trevisoli [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
A pesquisa objetivou analisar a suscetibilidade de duas populações distintas de Helicoverpa armigera a produtos comerciais à base de Bacillus thuringiensis (Bt) e isolados de Beauveria bassiana, Metarhizium anisopliae e Metarhizium rileyi. As populações foram coletadas em lavouras de soja nos municípios de Rio Verde (GO) e Luís Eduardo Magalhães (BA) e criadas em laboratório até a décima geração antes do início dos bioensaios. Os formulados utilizados foram Dipel® PM (B. thuringiensis var kurstaki), Xentari® WG (B. thuringiensis var. aizawai) e Agree® WG (B. thuringiensis var. aizawai GC91 transconjugado com B. thuringiensis var. kurstaki), com a aplicação de 50 ?L da suspensão do produto biológico, na concentração de 107 esporos viáveis/mL, sobre a superfície da dieta acondicionada em recipientes esféricos de plástico (2 cm de diâmetro x 3 cm de altura). Em cada recipiente foi inserida uma lagarta, de cada instar larval, em um total de 100 lagartas por tratamento distribuídas em 10 repetições. As avaliações referentes à mortalidade foram efetuadas a cada 24 horas, até o sétimo dia após a aplicação dos tratamentos. Os fungos B. bassiana e M. anisopliae foram obtidos a partir dos produtos comerciais biológicos Boveril® PM e Metarril® PM, respectivamente, enquanto que M. rileyi foi isolado de cadáveres de H. armigera, sendo padronizados na concentração de 108 conídios viáveis/mL. Como unidade experimental foram utilizados recipientes de plástico (2 cm de diâmetro x 3 cm de altura), com dieta artificial na qual uma alíquota de 50 ?L do fungo foi misturada ou aplicada na superfície. Em cada recipiente foi inserida uma lagarta de primeiro instar, com menos de 24 h de vida, totalizando 100 lagartas por tratamento distribuídas em 10 repetições. A mortalidade foi avaliada a cada 24 h, até o décimo dia após a aplicação dos tratamentos. Lagartas de primeiro instar de H. armigera, de ambas ...
The research aimed to assess the suscetibility of two distinct Brazilian populations of Helicoverpa armigera to commercial Bacillus thuringiensis insecticides and isolates of Beauveria bassiana, Metarhizium anisopliae and Metarhizium rileyi.The pest populations were collected in soybean fields located in Rio Verde (GO) and Luís Eduardo Magalhães (BA), taken to laboratory and reared until the tenth generation on artificial diet, to be used in the experiment.The bioassays were performed using spherical plastic receptacles (2-cm diameter x 3- cm height) containing artificial diet until complete the half volume. The formulated products used were Dipel® WP (B. thuringiensis var kurstaki), Xentari® WG (B. thuringiensis var. aizawai) and Agree® WG (B. thuringiensis var. aizawai GC91 with B. thuringiensis var. kurstaki), spraying 50 ?L of biological product solution at 107 viable spores/mL, on the surface of the diet. One caterpillar was inserted in each receptacle, related with larval instar, totaling 100 caterpillars per treatment and each group containing 10 caterpillars were considered a replication. Mortality were assessed each 24h, until the seventh day after the beginning of the bioassay. To perform the bioassays with entomopathogenic fungi, B. bassiana and M. anisopliae were obtained from the bio-insecticides Boveril® WP and Metarril® WP, respectively and M. rileyi was isolated from H. armigera cadavers at concentration of 108 viable conidia/mL. The bioassays were performed using spherical plastic receptacles (2-cmdiameter x 3-cm height) containing artificial diet until complete the half volume. After this step, a solution of 50 ?L containing the entomopathogenic fungi was sprayed on the diet surface. One caterpillar was inserted in each receptacle, with less than 24 h after hatch, totaling 100 caterpillars per treatment. Each group containing 10 caterpillars were considered a replication. Mortality were assessed each 24h, until ...
The research aimed to assess the suscetibility of two distinct Brazilian populations of Helicoverpa armigera to commercial Bacillus thuringiensis insecticides and isolates of Beauveria bassiana, Metarhizium anisopliae and Metarhizium rileyi.The pest populations were collected in soybean fields located in Rio Verde (GO) and Luís Eduardo Magalhães (BA), taken to laboratory and reared until the tenth generation on artificial diet, to be used in the experiment.The bioassays were performed using spherical plastic receptacles (2-cm diameter x 3- cm height) containing artificial diet until complete the half volume. The formulated products used were Dipel® WP (B. thuringiensis var kurstaki), Xentari® WG (B. thuringiensis var. aizawai) and Agree® WG (B. thuringiensis var. aizawai GC91 with B. thuringiensis var. kurstaki), spraying 50 ?L of biological product solution at 107 viable spores/mL, on the surface of the diet. One caterpillar was inserted in each receptacle, related with larval instar, totaling 100 caterpillars per treatment and each group containing 10 caterpillars were considered a replication. Mortality were assessed each 24h, until the seventh day after the beginning of the bioassay. To perform the bioassays with entomopathogenic fungi, B. bassiana and M. anisopliae were obtained from the bio-insecticides Boveril® WP and Metarril® WP, respectively and M. rileyi was isolated from H. armigera cadavers at concentration of 108 viable conidia/mL. The bioassays were performed using spherical plastic receptacles (2-cmdiameter x 3-cm height) containing artificial diet until complete the half volume. After this step, a solution of 50 ?L containing the entomopathogenic fungi was sprayed on the diet surface. One caterpillar was inserted in each receptacle, with less than 24 h after hatch, totaling 100 caterpillars per treatment. Each group containing 10 caterpillars were considered a replication. Mortality were assessed each 24h, until ...
Descrição
Palavras-chave
Pragas agricolas - Controle biologico, Bacillus thuringiensis, Metarhizium anisopliae, Lepidoptero, Lagarta, Fungos na agricultura, Bacterias, Agricultural pests
Como citar
AGOSTINI, Lucas Trevisoli. Suscetibilidade de Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) a entomopatógenos. 2014. xi, 87 p. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Ciências Agrárias e Veterinárias, 2014.