不同温度下稻螟赤眼蜂在黏虫卵上的种群生命表

稻螟赤眼蜂Trichogramma japonicum Ashmead是水稻二化螟Chilo suppressalis(Walker)的优势卵寄生蜂。本文构建了以黏虫卵为中间寄主,稻螟赤眼蜂在20℃、25℃、30℃、33℃四个温度条件下的生命表。研究结果表明利用黏虫卵繁育稻螟赤眼蜂时,不同温度下其生长发育和繁殖均存在显著差异,雌蜂平均寿命随温度的升高呈下降趋势,在20℃条件下,雌蜂平均寿命为1.44 d,显著长于其它温度,当温度为30~33℃时,雌蜂寿命最短,平均为0.59 d。在温度为20℃和25℃时,稻螟赤眼蜂的羽化率显著高于温度较高的30℃和33℃,平均为94.73%。在25℃条件下,黏虫卵繁育的稻螟赤眼蜂的净生殖力(R 0)最大,达到31.9176,单雌寄生卵数最多,为32.88个,表现出最强的繁殖能力,而在30℃条件下,瞬时增长率r m和周限增长率λ达到最大值。综合生命表参数、单雌寄生黏虫卵数、寿命、羽化率等指标,利用黏虫卵工厂化繁殖稻螟赤眼蜂的最佳温度为25℃。本研究为利用黏虫卵大量繁殖稻螟赤眼蜂提供了有价值的参考。

Population life table about Trichogramma japonicum reared on eggs of Mythimna separate under different temperatures

Trichogramma japonicum Ashmead is the dominant egg parasitoid of Chilo suppressalis(Walker).In this paper,the life table of T.japonicum was constructed under the conditions of 20℃,25℃,30℃and 33℃with armyworm eggs as the intermediate host.The results showed that there were significant differences in the growth and reproduction of T.japonicum populations reared under different temperatues.The average life expectancy of female wasps decreased with the increase of temperature,and it was significantly longer at 20℃than that at other temperatures.When the temperature was 30~33℃,the life expectancy of female was the shortest,only 0.59 d.At 20℃and 25℃,the emergency rate of T.japonicum was significantly higher than that of 30℃and 33℃,with an average of 94.73%.At 25℃,the net reproductive rate(R 0)of T.japonicum was the highest,which was 31.9176,and the number of eggs per female was the highest,which was 32.88,showing the strongest fecundity.At 30℃,the intrinsic rate of increase r m and the finite rate of increaseλreached the maximum.Taken together,the optimum temperature for the factory reproduction of T.japonicum on armyworm eggs was 25℃.