Occurrence Dynamics of Ostrinia furnacalis and Application Effect of Biological Control Technology in Wafangdian, Liaoning Province

摘要

In order to determine the population dynamics of Ostrinia furnacalis and reasons of local heavy occurrence in Wafangdian,Liaoning Province,adult sexual attraction monitoring and larva damage investigation of O.furnacalis were carried out from 2016 to 2018.The results showed that the initial occurrence period of overwintering adults of O.furnacalis in 2017 and 2018 was 10-16 d earlier than that in 2016,and the occurrence period of adults in the field was extended for 22-26 d,with three occurrence peaks of adults;the number of young larvae in corn field increased significantly in early September.In 2017 and 2018,the control effects of Trichogramma dendrolimi release on the first generation of O.furnacalis in 2017 and 2018 were 70.65%and 67.84%,respectively,lower than that in 2016(76.19%).It is speculated that the difference of annual climatic conditions and adjustment of local planting structure are the main reasons for population dynamic changes of O.furnacalis.