[Control efficacy of Trichogramma japonicum against Chilo suppressalis and Chilaraea auricilia].

ABSTRACT

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 (r(m)) 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 r(m) was 0.3154 and 0.3161, respectively. These parameters indicated that T. japonicum could control the two rice borers effectively.