Chemical control of insect infestation in stored-cacao Bahia, Brasil
An experiment was conducted to evaluate insecticide sprays for the protection of bagged cacao. The insecticides along with the number of mg of active ingredients applied per m2 on the bags were as follows: a - fenitrothion - 500; b - fenitrothion - 750; c - permethrin - 250; d - permethrin - 500; e - pirimiphos-methyl - 500; and f - chlorphyrifos-methyl - 500. A second experiment was carried out to evaluate fumigation of bagged cacao beans using different dosage rates of phosphine during 48 hr or 72 hr of exposure. Pirimiphos-methyl, chlorpyrifos-methyl and permethrin were the most effective insecticides for the protection of bagged cacao beans. The spraying of bags at intervals of 2 months after an initial fumigation with phosphine gave good protection of the cacao beans for at least 10 months. All the dosage rates of phosphine used in the evaluation of fumigation on bagged cacao were effective in controlling beetle populations associated with stored-cacao in Bahia. However, Carpophilus spp. was the most difficult group of beetles to control in this experiment. Efficient control of Carpophilus spp. was achieved only with the dosage rate of 1 pellet/4 bags for 48 hr of exposure, or with longer exposure (72 hr) at any of the rates
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| Format: | biblioteca |
| Published: |
1980
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| Subjects: | THEOBROMA CACAO, PLAGAS DE PRODUCTOS ALMACENADOS, CONTROL QUIMICO, INSECTICIDAS, PULVERIZACION, CARPOPHILUS, BAHIA, BRASIL, |
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| Summary: | An experiment was conducted to evaluate insecticide sprays for the protection of bagged cacao. The insecticides along with the number of mg of active ingredients applied per m2 on the bags were as follows: a - fenitrothion - 500; b - fenitrothion - 750; c - permethrin - 250; d - permethrin - 500; e - pirimiphos-methyl - 500; and f - chlorphyrifos-methyl - 500. A second experiment was carried out to evaluate fumigation of bagged cacao beans using different dosage rates of phosphine during 48 hr or 72 hr of exposure. Pirimiphos-methyl, chlorpyrifos-methyl and permethrin were the most effective insecticides for the protection of bagged cacao beans. The spraying of bags at intervals of 2 months after an initial fumigation with phosphine gave good protection of the cacao beans for at least 10 months. All the dosage rates of phosphine used in the evaluation of fumigation on bagged cacao were effective in controlling beetle populations associated with stored-cacao in Bahia. However, Carpophilus spp. was the most difficult group of beetles to control in this experiment. Efficient control of Carpophilus spp. was achieved only with the dosage rate of 1 pellet/4 bags for 48 hr of exposure, or with longer exposure (72 hr) at any of the rates |
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