Oriental Fruit Fly: Factors Affecting Ethylene Dibromide Fumigation of Infested Papayas

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Abstract:

The minimal dose of ethylene dibromide (EOB) needed to obtain 99.997% mortality of eggs and larvae of Dacus dorsalis Hendel in papayas, Carica papaya L., varied with the concentration of EDB in the fumigation chamber, the type and number of containers, and the fumigation temperature. The effect of container type on the EDB concentration after 0.5 h of fumigation was increased adsorption of EDB in the following order: perforated polyethylene tray < painted wooden field box < wooden field box ≤ fiberboard carton. Hot water treatments to control anthracnose of papaya improved the efficacy of EDB fumigation and reduced EDB residues more as a postfumigation treatment than prefumigation treatment

The quarantine treatment developed for oriental fruit fly-infested papayas in perforated polyethylene trays was fumigation with 7 g EDB/m3 for 2 h at 21.1°C and loading of 46% (by volume). The EDB residues in such fumigated papayas after 1-, 3-, and 5-day storage in cartons at 12.8°C were 2.1±0.12, 0.6±0.05, and 0.4±0.07 ppm, respectively. When similarly treated fruits were hot water-treated for 20 min at 46.1°C after the fumigation, the residues, at similar times and storage, were 1.8±0.2, 0.5±0.05, and 0.1 ±0.02 ppm.

The quarantine treatment developed for fruits in wooden field boxes was fumigation with 8 g EDB/m3 for 2 h at 21.1°C plus postfumigation hot water treatment at 60.6°c for 20 sec. For such fruits stored 1 and 3 days in cartons at 20.0°-25.6°C (ambient temperature), the EDB residues were 0.4±0.04 and 0.05 ppm to trace, respectively; after 1, 3, and 5 days of storage at 7.2°C, the residues were 2.1±0.13, 0.7±0.06, and 0.3±0.02 ppm, respectively.

Document Type: Research Article

Publication date: June 1, 1979

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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