Eradication of the melon fly from Kikai Island by the application of the sterile insect release method. 5. Method for releasing sterile pupae.:5. Method for releasing sterlie pupae
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To eradicate the melon fly, Dacus cucurbitae COQUILLETT, from Kikai Island (55.7 km<SUP> 2</SUP>), release of the sterile flies was started on August 21, 1981. At least 4 million pupae have been released each week up to now. The pupae were placed in 420 buckets for release, and then the buckets were distributed at 210 points over the whole area of the island using a method similar to that adopted on Kume Island, Okinawa Pref. One or two weeks after the release, empty pupal skins and other residues were sampled from 20 points to estimate the rate of emergence from the buckets. The results of 101 release trials during two years up to August 19, 1983 showed that the emergence rate was strongly affected by the temperature. The rate became low both in the cool season (from December to February) and in the hot season (from July to August). Especially, in the coolest period when the mean temperature during four days after placing the pupae in buckets was below 15-16°C, the emergence rates were very low. Soon after the release was started, two problems were encountered one was that rain water leaked into the buckets and the other was that the teneral adults sometimes failed to creep out of the bucket. To overcome these problems, the bucket for release was modified in two ways. The under surface of the styrofoan lid of the bucket was pasted with a waterproof plastic sheet to prevent the leak of rain water, and the inner surface of the bucket was scraped with a wire brush so that the teneral adults could easily creep out.
- 九州病害虫研究会の論文
九州病害虫研究会 | 論文
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