不同生存基质对中华淡翅盲蝽生长发育和繁殖的影响

中华淡翅盲蝽Tytthus chinensis (Stål) 是稻飞虱最重要的捕食天敌之一,因此实现中华淡翅盲蝽人工饲养是有效控制褐飞虱的关键。采用四季豆、湿棉球、水稻茎作为生存基质人工饲养中华淡翅盲蝽,研究其对中华淡翅盲蝽若虫生长发育和成虫繁殖的影响。结果表明,中华淡翅盲蝽若虫在水稻茎上的存活率最高,其次是四季豆,最低的是湿棉球,在水稻上的若虫历期显著短于在其他2个基质上。虽然在四季豆上的产卵量要显著低于水稻上的产卵量,但雌虫寿命、卵孵化率和若虫存活率与在水稻上的差异不显著,且显著高于湿棉球上的;在湿棉球上的卵孵化时间显著长于在四季豆和水稻茎上的时间。中华淡翅盲蝽在水稻和四季豆上种群趋势为22.9和11.2,能建立持续的种群,说明四季豆可以作为中华淡翅盲蝽室内饲养的生存基质,进行中华淡翅盲蝽的人工繁殖。

Effects of different survival substrates on growth,development and reproduction of Tytthus chinensis

Tytthus chinensis (Stål) is a key predator of rice planthopper, a major pest of rice in China. Biological control of rice planthopper could be much more effective and feasible by improving the techniques of artificial breeding of natural enemies. The purpose of this study was to test the effect of different survival substrates, including kidney bean, wet cotton ball and rice stem, on the growth, development and reproduction of T.chinensis. The results showed that different survival substrates had significant influence on the development, survival and reproduction of T. chinensis. The survival rate of T. chinensis was the highest in the rice stem treatment, followed by the kidney bean treatment. The survival rate in wet cotton ball treatment was the lowest. Nymph duration in rice stem treatment was significantly shorter than the other two treatments, which indicated that kidney bean and wet cotton ball significantly impact the growth of T.chinensis. Though the fecundity in kidney bean treatment was significantly lower than those in rice treatment, the longevity, egg hatching rate and nymphal survival rate in kidney bean treatment were similar with those in rice stem treatment, and were significantly higher than those in wet cotton ball treatment. The population trend index of T. chinensis on rice stem and kidney bean treatment was 22.9 and 11.2 respectively, which meant T. chinensis could build a continuous population efficiently. The results indicated that kidney bean could be used as a feasible survival substitute for T. chinensis.