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橘小实蝇Bactrocera dorsalis在上海地区1 a发生6~7代,主要发生在5—11月,个别暖冬,成虫可存活至12月上旬。该虫每年5月零星发生,随着气温的上升,虫口数量不断增加,9月中下旬达到高峰,之后随着气温的下降,虫口数量也呈下降趋势,全年呈单峰型变动。橘小实蝇在上海的虫口数量变动主要受降水影响,温度和寄主果实也是重要的影响因子。
Bactrocera dorsalis occurs 6 to 7 generations in Shanghai area during January to November, mainly in May to November. Some individuals are warm in winter and adults can survive to early December. The insects occurred sporadically in May each year. With the increase of temperature, the number of insects increased continuously and reached the peak in late September. After that, the population of insects decreased with the decrease of temperature, showing a monomodal change throughout the year. Changes in the population of the orange fruit flies in Shanghai are mainly affected by precipitation, temperature and host fruit are also important impact factors.