Infectivity of oil and water formulations of Beauveria bassiana (Deuteromycotina: Hyphomycetes) to the cocoa weevil pest Pantorhytes plutus (Coleoptera: Curculionidae)
Adults of the cocoa weevil pest, Pantorhytes plutus, were inoculated on the mouthparts with measured doses of conidial suspensions of the fungal pathogen Beauveria bassiana isolated from a field-collected infected adult. The LD50 values for formulations in coconut oil and water + 0.01 percent. Tween-80 were 1.18 x 10 exponent 3 and 4.29 x 10 exponent 4, respectively. The oil suspension remained infective when applied by a motorized ultralow volume mistblower and could be stored for 40 days in the refrigerator. Natural infection in the field was very rarely recorded, but mortality due to inapparent infections which developed in uninoculated adults during the 50-day incubation period ranged from 7.2 to 14.4 percent and was still 1.7 to 7.2 percent when the food was surface-sterilized to eliminate contamination. Control by augmentative application is discussed.
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
1988
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| Subjects: | THEOBROMA CACAO, PANTORHYTES PLUTUS, SCOLYTIDAE, INSECTOS DAÑINOS DEL TALLO, BEAUVERIA BASSIANA, ENEMIGOS NATURALES, CONTROL BIOLOGICO, INSECTICIDAS, MEZCLA DE INSECTICIDAS, INOCULACION, PAPUA NUEVA GUINEA, |
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| Summary: | Adults of the cocoa weevil pest, Pantorhytes plutus, were inoculated on the mouthparts with measured doses of conidial suspensions of the fungal pathogen Beauveria bassiana isolated from a field-collected infected adult. The LD50 values for formulations in coconut oil and water + 0.01 percent. Tween-80 were 1.18 x 10 exponent 3 and 4.29 x 10 exponent 4, respectively. The oil suspension remained infective when applied by a motorized ultralow volume mistblower and could be stored for 40 days in the refrigerator. Natural infection in the field was very rarely recorded, but mortality due to inapparent infections which developed in uninoculated adults during the 50-day incubation period ranged from 7.2 to 14.4 percent and was still 1.7 to 7.2 percent when the food was surface-sterilized to eliminate contamination. Control by augmentative application is discussed. |
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