. Cooperative economic insect report. Insect pests Control United States Periodicals. - 1122 - INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES JAPANESE ORANGE FLY (Dacus tsuneonis Miyake) Economic Importance: This tephritid, described by Tsunekata Miyake in 1919, is one of the most important pests of citrus in Japan. In that country, it is found only in Kyushu and on Amami-O-shima Island. Extensive outbreaks have occurred in some commercial citrus areas since 1947 when up to 60 percent or more of the fruits were infested. In Szechwan Province of southwestern China, the fruit fly has also been
. Cooperative economic insect report. Insect pests Control United States Periodicals. - 1122 - INSECTS NOT KNOWN TO OCCUR IN THE UNITED STATES JAPANESE ORANGE FLY (Dacus tsuneonis Miyake) Economic Importance: This tephritid, described by Tsunekata Miyake in 1919, is one of the most important pests of citrus in Japan. In that country, it is found only in Kyushu and on Amami-O-shima Island. Extensive outbreaks have occurred in some commercial citrus areas since 1947 when up to 60 percent or more of the fruits were infested. In Szechwan Province of southwestern China, the fruit fly has also been reported to have infested 50 percent of the oranges at Kiangtsin during 1940. Distribution: Japan (Kyushu and Amami-O-shima Island) and southwestern China (Szechwan and Kweichow Provinces). Hosts: Citrus, including orange, grapefruit and mandarin General Distribution of Dacus tsuneonis Miyake Life History and Habits: The biology as studied in Japan is as follows: Adult emergence dates vary from place to place, but detailed studies show that the emergence period covers about 50 days from the beginning of June to the middle of July. They are occasionally found as late as October, however. The length of the preoviposition period of the adults reared under field laboratory condi- tions was between 17 and 25 days. The ratio of males to females was one to one. It appears that copulation is of frequent necessity with the females that are freely ovipositing, and copulation probably takes place after depositing each batch of eggs. The adults feed on honeydew excreted by various species of aphids, coccids and psyllids, which appears necessary for health, longevity and (Tephritidae, Diptera) No. 141 of Series. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Bureau of Entomology and Plant Quarant
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