【摘要】 本文研究了宽带细腹食蚜蝇Sphaerophoria macrogaster(Thompson)的生物学特性,发现该食蚜蝇在福州一年发生7代,各代的历期分别为46.3天、30.9天、66.7天、23.1天、26.1天、37.1天与131.2天。主要以蛹在土壤中越冬和越夏,所以第7代与第3代的历期都很长,蛹期也比其他各代长,分别为100天与45天。每雌的平均产卵量为20.8粒。幼虫期的总捕蚜量为286.7头,其中2、3龄幼虫的捕蚜量占幼虫期总捕蚜量的98.2％。更多还原

【Abstract】 Sphaerophoria macrogaster (Thompson), an important natural enemy of aphids, develops 7 generations per year in Fuzhou, China. The duration of each generation lasts 46- 3 days, 30. 9 days, 66- 7 days, 23. 1 days, 26. 1 days, 37. 1 days and 131. 2 days respectively. Because of overwintering and oversummering with pupa under the ground, the duration of the 7th and 3rd generations is longer than other generations and their pupal stage also longer with 100 days and 45 days respectively. The mean fecundity per female is 20. 8 eggs. During larval stage the total number of prey consumed by larvae is 286. 7 aphids, of which 98. 2% prey con-sumed by the 2nd and 3rd instar larvae.更多还原