稻螟赤眼蜂对二化螟和台湾稻螟的控制潜能评价

Control efficacy of Trichogramma japonicum against Chilo suppressalis and Chilaraea auricilia

为了明确稻螟赤眼蜂种群增长力与水稻螟虫种群增长力之间的关系和评价稻螟赤眼蜂的控害能力,通过生命表方法,组建了二化螟和台湾稻螟在水稻上的实验种群生命表,以及稻螟赤眼蜂在二化螟卵和台湾稻螟卵上的生殖力表,测定了稻螟赤眼蜂对两种螟虫卵的寄生能力.结果表明:二化螟和台湾稻螟的世代历期(T)分别为56.40d和47.80d,内禀增长率(rm)分别为0.0489和0.072.稻螟赤眼蜂在二化螟卵和台湾稻螟卵上的平均T分别为9.75d和9.78d,rm分别为0.3161和0.3154.通过比较分析稻螟赤眼蜂与两种螟虫的实验种群生命表参数,可知稻螟赤眼蜂能够有效控制两种水稻螟虫,赤眼蜂种群增长力相对于螟虫种群是超前而不是跟随关系.

In order to understand the relationships of the population increase capacities between egg parasitoid Trichogramma japonicum Ashmead （Hymenoptera： Trichogrammatidae） and two rice borers Chilo suppressalis Walker and Chilaraea auricilia Dudgeon （Lepidoptera： Pyralidae）, and to evaluate the control efficacy of T. japonicum against C. suppressalis and C. auricilia, life table method was adopted to establish the experimental population life tables of the two rice borers and the population fecundity tables of T. japonicum on the two hosts, and to estimate the fecundity and parasitism capacity of T. japonicum on the two hosts. The generation period （T） of C. suppressalis and C. auricilia was 56.40 d and 47.80 d, and their intrinsic rate of natural increase （rm） was 0.0489 and 0.072; while the T of T. japonicum on C. suppressalis and C. auricilia was 9.75 d and 9.78 d, and the rm was 0.3154 and 0.3161, respectively. These parameters indicated that T. japonicum could control the two rice borers effectively.