Effects of temperature on the reproduction and development of Drosophila suzukii (Diptera: Drosophilidae)
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The objective of this study was to elucidate how temperature affects the reproduction and development of Drosophila suzukii (Matsumura) (Diptera: Drosophilidae), an emerging major pest of blueberry in Japan. Although extensive studies of the biology of this pest have been carried out, the effects of temperature on its reproduction and development remain unknown. We found that when adults mated at 31 °C for 4 days, none of the eggs hatched. Female oviposition and egg hatching rate were also reduced as temperature increased during the oviposition period. When D. suzukii larvae developed above 31 °C, pupation and adult eclosion were abolished. According to field observations, adult D. suzukii ceased to appear from the end of July 2010, when the average temperature exceeded 28 °C or when the temperature within a day exceeded 33 °C for 8 h or more. Experiments in which the mating temperature fluctuated within a day revealed that both the number of eggs oviposited and their hatch rate were significantly suppressed when the daily temperature regime during mating was either 31 °C for 12 h/25 °C for 12 h or 33 °C for 8 h/25 °C for 16 h, relative to the values at 25 °C for 24 h.
KeywordsOviposition Larval development Mating
Authors sincerely thank Drs. Isao Ogiwara, Takashi Motobayashi, Hidenobu Tsujimura, Jun Shimada, Tomoe Shimizu and Takuya Ban, Mr. Satoshi Noma and Ms. Mika Mashimo of Tokyo University of Agriculture and Technology, Dr. Koichiro Tamura of Tokyo Metropolitan University and Dr. Ian Smith. This project was partially supported by a special research fund of the Ministry of Education, Culture, Sports, Science and Technology in Japan: “Research and development of security and safe crop production to reconstruct agricultural lands in Fukushima Prefecture based on novel techniques to remove radioactive compounds using advanced bio-fertilizer and plant protection strategies” and the Ministry of Agriculture, Forestry and Fisheries in Japan: “Demonstration of off-season blueberry harvesting technique in cooperation with nursery in advanced plant factory” in A Scheme to Revitalize Agriculture and Fisheries in Disaster Area through Deploying Highly Advanced Technology.
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