|Title:||東方果蠅DACUS DORSALIS HENDEL為害木瓜調查||Other Titles:||Investigation of the Oriental Fruit Fly Dacus Dorsalis Hendel Damaging on Papaya||Authors:||李錫山
|Issue Date:||7-Jun-1976||Publisher:||農業試驗所||Journal Volume:||25||Journal Issue:||2||Start page/Pages:||156-162||Source:||中華農業研究||Abstract:||
The investigation was carried out during 1973 to 1975. Field evidences revealed that the Oriental fruit flies visited the papaya orchards all year round. The peak population increased to its highest during the summer and autumn seasons, and decreased to the lowest in spring. It was positively related to the temperature as well as the growing conditions of papayas. The activity of the flies during the day time was chiefly influenced by both temperature and weather. When the temperature was below 22°C the flies appeared more between 9:00 a. m. to 15 00 p. m. and the higher the temperature rose the earlier the flies appeared, but activity paused when the temperature went down below 14°C. Flies came out in large numbers on sunny days and less on rainy day. Sometimes they swarmed out suddenly in large numbers on sunny days followed by several days of cold and rain.
The experimental papaya fruits were divided into five degrees of maturity in order to examine the damage due to fruit flies. A total of 4,735 fruits of the variety Sunrise Solo and 1275 fruits of Kapoho Solo were taken from the experimental field for laboratory examination. There was no pupa of fruit flies found during the 24 months of investigation, even no trace of deposition of eggs on the surface of papaya fruit.
According to Misaka (三板) (1938) , who had previously investigated papaya fruits in Taiwan, no evidence of damage of fruit flies on papaya fruits was found in fields under natural conditions.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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