Effects of High Temperature and Insecticides against Spodoptera frugiperda on Telenomus remus
YANG Huquan
YAN Chaojianping
SUN Ganlin
CAI Haosheng
XIE Yonghui
LIU Zhengling
GU Xiaofei
CHEN Bin
Abstract：To clarify the effects of high temperature and insecticides on the parasitic capacity of Telenomus remus,and to optimize its integrated use with chemical controls against Spodoptera frugiperda,the lifespan and parasitic capacity of T.remus at 26℃and 35℃were determined,and the safety of five common insecticides against T.remus was also evaluated via selective toxicity assays.Results showed that when exposed to 35℃,the survival time and parasitism of T.remus decreased,the parasitism duration of single egg and the parasitism interval of eggs increased,and the emergence rate of T.remus decreased,and the negative effect increased with the prolongation of exposure time.Compared to 26℃,exposure to 35℃for 12,24,and 48 h reduced parasitoid survival time by 13.28%,13.55%,and 32.88%,respectively;the total parasitism by 20.84%,27.13%,and 46.26%,and emergence rate by 9.22%,11.80%,and 19.26%.Concurrently,the time required to parasitize a single egg was extended by 26.98%,38.25%,and 79.71%,and the parasitism interval of eggs increased by 22.93%,46.50%,and 71.81%.The 5%lufenuron,30%chlorantraniliprole,5%emamectin benzoate,10 billion PIB S.litura nucleopolyhedrovirus,and 10 billion cfu/g Bacillus thuringiensis,all exhibited negative selectivity against both adult T.remus and parasitized eggs.The selective toxicity ratio(STR)values for adult T.remus were 0.94,0.93,0.42,0.73,and 0.78,respectively,while the STR values for parasitized eggs were 0.62,0.71,0.73,0.86 and 0.75,respectively.In conclusion,high-temperature 35℃reduces the parasitic effect of T.remus,so the release of T.remus at 35℃should be avoided.While integrated use of T.remus with 5%lufenuron shows potential for field control of S.frugiperda,insecticide applications should be withheld as much as possible during the peak period of parasitized eggs.
Keywords：Telenomus remusSpodoptera frugiperdaHigh temperatureInsecticideSelective toxicity ratio(STR)
Publication Date：2026-06-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 92-99 )