Evaluation of Fecundity,Flight Ability and Insecticide Tolerance of Southern and Northern Trichogramma japonicum Populations

doi:10.16409/j.cnki.2095-039x.2017.01.005

Abstract

Abstract: Appropriate Trichogramma population is a key factor for successful Trichogramma release for control of Lepidopteran pests. In the present study, we evaluated fecundity, flight ability and insecticide tolerance of T. janponicum Ashemead. The results showed that under high temperatures (32℃ and 36℃), fecundity of a southern population on Corcyra cephalonica eggs was 26.6 and 9.5, respectively, significantly higher than those of a northern population (11.7 and 4.0, respectively). However, there was no significant difference in fecundity of T. japonicum on Cnaphalocrocis medinalis eggs between the two populations. As temperature increased, the proportion of flying wasps increased. At 34℃, the proportion of flying wasps in the southern population was 57.0%, which was significantly higher than that (20.4%) in the northern population. Tolerances of T. japonicum to validamycin, triadimefon and pymetrozine were not significantly different between the two populations. However, LC₅₀ to chlorpyrifos in the southern population was 0.382 mg/L, which was significantly higher than that (0.046 mg/L) in the northern population. Therefore, the southern population of T. japonicum is a better choice for biological control Lepidopteran pests in southern China.

Key words: Trichogramma japonicum, Cnaphalocrocis medinalis, biological control, geographic populations

CLC Number:

S476.3

TIAN Junce, WANG Zichen, WANG Guorong, ZHENG Xusong, ZANG Liansheng, LÜ Zhongxian. Evaluation of Fecundity,Flight Ability and Insecticide Tolerance of Southern and Northern Trichogramma japonicum Populations[J]. journal1, 2017, 33(1): 32-38.

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