Virulence of the entomopathogenic fungus <Emphasis Type="Italic">Metarhizium anisopliae</Emphasis> using soybean oil formulation for control of the cotton stainer bug, <Emphasis Type="Italic">Dysdercus peruvianus</Emphasis> |
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Authors: | Lucélia Santi Lucas André Dedavid e Silva Walter Orlando Beys da Silva Ana Paula Folmer Corrêa Drauzio Eduardo Naretto Rangel Célia Regina Carlini Augusto Schrank Marilene Henning Vainstein |
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Institution: | 1.Centro de Biotecnologia,Universidade Federal do Rio Grande do Sul,Porto Alegre,Brazil;2.Instituto de Ciências e Tecnologia dos Alimentos,Universidade Federal do Rio Grande do Sul,Porto Alegre,Brazil;3.Instituto de Pesquisa e Desenvolvimento,Universidade do Vale do Paraíba,S?o José dos Campos,Brazil;4.Departamento de Biofísica,Universidade Federal do Rio Grande do Sul,Porto Alegre,Brazil |
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Abstract: | The cotton stainer bug Dysdercus peruvianus (Hemiptera: Pyrrhocoridae) is an insect pest that causes heavy losses in cotton plantations. The need to reduce the use of insecticides for control of this pest has increased steadily, and Metarhizium anisopliae (Ascomycota: Clavicipitaceae) could be an important biopesticide candidate to control this pest. The effect of M. anisopliae on D. peruvianus nymphs and adults using formulations with soybean oil and Agral® was evaluated. Formulation using 10% soybean oil added to 108 conidia mL?1 (grown on used and reused rice) was the most effective for nymph and adult, causing 100% mortality 6 and 7 days after exposure, respectively. The SEM analysis of infected insects showed that M. anisopliae conidia were able to adhere anywhere on the exoskeleton, but were more abundant between the joints. Using the same rice for two batches of growth may be an option for improving commercial conidial production of M. anisopliae and may reduce overall costs. Its effect on D. peruvianus adults opens a new possibility for using this fungus as an alternative to chemical pesticides and the use of M. anisopliae in association with integrate pest management. |
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