温度对白蜡吉丁柄腹茧蜂发育和繁殖的影响

为了提高白蜡窄吉丁Agrilus planipennis的重要天敌——白蜡吉丁柄腹茧蜂Spathius agrili Yang的繁育效率, 本研究调查了不同温度（22, 24, 26, 28, 30和32℃）对该蜂生长发育及繁殖的影响。结果表明, 在22~32℃范围内, 白蜡吉丁柄腹茧蜂的卵、茧蛹及世代发育速率均随着温度的升高而加快, 而幼虫的发育速率在26℃时最快. 卵、幼虫、茧蛹和世代的发育起点温度分别为14.34, 16.89, 14.16和13.84℃, 有效积温分别为24.59, 61.16, 166.27和276.80日·度。温度对白蜡吉丁柄腹茧蜂的寄生率、寄生成功率、产卵量、子代蜂数量和性比都有不同程度的影响。据此提出适于人工繁育白蜡吉丁柄腹茧蜂的温度范围为26~28℃。

Effects of temperature on development and reproduction of parasitic wasp Spathius agrili Yang (Hymenoptera:Braconidae),an effective parastoid of emerald ash borer

To increase the reproduction rate of Spathius agrili Yang (Hymenoptera; Braconidae), an effective larval parasitoid of emerald ash borer, Agrilus planipennis, in China, the effects of different temperatures (22, 24, 26, 28, 30 and 32℃) on the development and reproduction of this wasp were investigated in the laboratory. The results showed that the developmental rate of egg, pupa and the whole generation of S. Agrili increased with the increase of temperature from 22℃ to 32℃, but the highest developmental rate of larva was at 26℃. The developmental threshold temperatures required by egg, larva, pupa and whole generation were 14.34, 16.89, 14.16 and 13.84t, respectively, while the effective accumulated temperatures were 24.59, 61.16, 166.27 and 276. 80 degree-days, respectively. Temperature had effects on the parasitism rate, the rate of successful parasitism, number of eggs laid, the number of wasps and the sex ratio of the offspring with different degrees. It is so proposed that the suitable temperature for artificial rearing of S. Agrili ranges from 26℃ to 28℃.