摘要
颈双缘姬蜂对小菜蛾不同日龄蛹有明显的选择性，对０～１天蛹龄的选择性指标，分别为１～２天、２～３天、３～４天的１．７、７．３和１９．１倍；在龄期较低的寄主蛹中，寄生成功羽化出蜂率较高，育出的雌蜂个体较大，生殖力较高，成蜂寿命较长，但未成熟期发育历期、子代性比则不受育蜂寄主蛹龄的影响，雌蜂虫体大小各指标与其生殖力和寿命三者之间相关密切。从０～１天蛹龄中育出的雌蜂，比１～２天和２～３天平均寄生寄主头数，分别高出３．６１、４．５１倍，成蜂寿命分别长１倍以上。
The preference and suitability of Diadromus collaris to pupae of Plutella xylostella of four successive developmental stages(0 1,1 2,2 3 and 3 4d old at 25℃ respectively) were studied in the laboratory. The preference index to 0 1d old pupae was 1.7,7.3 and 19.1 times as high as those to 1 2,2 3 and 3 4d old pupae respectively. Host suitability decreased with host age. The rate of successful parasitization, defined as the proportion of parasite which developed successfully to adult emergence, decreased from 80% to 0 as the host age increased from 0 1 to 3 4d old. The resultant female wasps reared from the younger hosts had larger body size, higher fecundity, and longer adult lifespan, compared to those reared from the older hosts. In female adults, the body size, fecundity and adult lifespan were positively correlated to each other. On average, the total number of host pupae parasitized by a female adult reared from 0 1d old host was 3.6, 4.5 times as high as those of the parasites reared from 1 2 and 2 3d old host pupae respectively.
出处
《中国生物防治》
CSCD
1997年第3期101-105,共5页
Chinese Journal of Biological Control
基金
澳大利亚国际农业研究中心资助
关键词
颈双缘姬蜂
小菜蛾
选择性
适合性
iadromus collaris Plutella xylostella host age preference host suitability
