【摘要】 比较了两个品系 (分别来自北京和美国 )丽蚜小蜂在不同温度下寄生番茄烟粉虱的发育历期 ,取食不同食物的寿命 ,发育起点温度和有效积温。结果表明 ,在 1 8～ 3 3℃ ,丽蚜小蜂的发育历期随温度升高而加快。两品系在 1 8℃下发育历期最长 ,美国品系为 3 4.7d ,北京品系为 3 6.1d ;在 3 3℃下发育历期最短 ,分别为 7.8和 8.4d ;且在 1 8和 2 3℃下 ,美国品系的发育历期显著短于北京品系。与饥饿处理相比 ,喂食 1 0 %蜜水和 /或 3～ 4龄粉虱若虫 ,可延长成虫寿命 ;且不同温度条件下成虫寿命差异显著 ,两品系均表现出 1 8℃下寿命最长 ,3 3℃时寿命最短。丽蚜小蜂由产卵至成虫羽化、成虫期和全世代的发育起点温度和有效积温 :美国品系分别为 1 3 .1、1 2 .3、1 2 .8℃和 1 77.2 3、1 79 1 1、3 53 .53日度 ;北京品系分别为 1 3 .2、1 1 .4、1 2 .4℃和 1 88.2 5、1 68.58、3 58.2 8日度。更多还原

【Abstract】 Developmental time, adult longevity, temperature threshold and effective temperature of two strains of Encarsia formosa from Beijing and originally introduced from USA on Bemisia tabaci were studied at 18-33℃. It showed that the developmental time from egg to adult of both strains decreased significantly with the increase of temperature, which ranged from 34.7d at 18℃ and 7.8d at 33℃ for the USA strain, and 36.1d and 8.4d for the Beijing strain. Besides, the development rate of the USA strain was significantly faster than that of the Beijing strain at 18 and 23℃. Adult longevity of E. formosa were strongly affected both by temperatures and diets. The provision of honey water and/or 3rd-4th instars whitefly nymphs could prolong adult longevity, which was the longest at 18℃ and the shortest at 33℃. For the USA strain, the temperature threshold for the immature stage, adult stage and the whole generation were calculated to be 13.1, 12.3, 12.8℃, respectively. And the effective temperature sums for these stages were assessed as 177.23, 179.11 and 353.53 degree-day, respectively. For the Beijing strain, these were 3.2, 11.4, 12.4℃ and 188.25, 168.58 and 358.28 degree-day, respectively.更多还原