ação do fungo beauveria bassiana, isolado 986, sobre o ciclo biológico do cascudinho alphitobius diaperinus em laboratório action of the fungus beauveria bassiana, strain 986, over the biologic cycle of the alphitobius diaperinus beetle in laboratory

Clicks: 177
ID: 132956
2006
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Abstract
O presente trabalho foi realizado para verificar a eficácia do fungo Beauveria bassiana em todas as etapas de desenvolvimento de Alphitobius diaperinus e assim saber em que fase ele é mais susceptível ao controle biológico. O fungo B. bassiana, isolado 986, foi testado em duas concentrações (3,4 X 10(6) e 3,4 X 10(8) conídios ml-1) mais um grupo controle. Foram realizadas duas leituras, uma sete e outra quatorze dias após a aplicação dos fungos. Na concentração 3,4 X 10(6), 54% dos ovos tratados estavam inférteis, ocorrendo 54% de mortalidade de larvas tratadas nos estádios I, II e III, 22,5% nos estádios IV, V e VI, 9,5% nos estádios VII e VIII e 24,5% de mortalidade das pupas. Na concentração 3,4 X 10(8), 66,8% dos ovos tratados estavam inviáveis, ocorrendo mortalidade de 56% das larvas tratadas nos estádios I, II e III, 34% nos estádios IV, V e VI, 24,5% nos estádios VII e VIII e 49,5% das pupas. Já no grupo controle, 13,3% dos ovos estavam inviáveis, ocorrendo mortalidade de 10% das larvas nos estádios I, II e III, 4% nos estádios IV, V e VI e 0% de mortalidade nos estádios VII, VIII e em pupas. Sobre o cascudinho adulto, o fungo não teve efeito nocivo em nenhum grupo analisado. Com base nesses resultados, observou-se que o fungo nas concentrações testadas apresentou efeito nocivo às fases do ciclo biológico do cascudinho, com exceção do inseto adulto.
The present research was carried out to verify the Beauveria bassiana fungus efficacy in all development phases of Alphitobius diaperinus and to know in which phase it is more susceptible for biologic control. The B. bassiana, 986-isolated fungus, was tested in two different concentrations (3.4 x 10(6) and 3.4 x 10(8) conidium ml-1) and a control group. Two readings were realized, one after 7 days of fungus application and the other after 14 days. At concentration of 3.4 x 10(6) conidium ml-1, 54% of treated eggs were infertile, with larva death of 54% at I, II and III phase, 22.5% at IV, V, and IV phase and 9.5% at VII and VIII phase. For pupa stage 24.5% of death was found. At concentration of 3.4 x 10(8) conidium ml-1, 66.8% of treated eggs were impracticable occurring treated larva death of 56% at I, II and III phase; 34% at IV, V and VI phase, 24.5% at VII and VIII phase and 49.5% at pupa phase. For control group, 13.3% of eggs were not viable with larva death of 10% at I, II and III phase, 4% at IV, V and VI phase and 0% at pupa, VII and VIII phase. About the adult lesser mealworms, the fungus did not present noxious effect at all analyzed group. In conclusion, these results showed that the fungus at tested concentrations presented noxious effect at all biologic cycle phases of lesser mealworms, except for the adult insect.
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Authors ;Aleksandro Schafer da Silva;Amanda Pífano Neto Quintal;Sílvia Gonzalez Monteiro;Rovaina Laureano Doyle;Janio Morais Santurio;Vânia Rita Elias Pinheiro Bittencourt
Journal Trials
Year 2006
DOI
10.1590/S0103-84782006000600047
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782006000600047
Keywords
avicultureagricultureagriculture (general)

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