Control effect of insect pathogenic fungi combined with biogenic insecticides on the larvae of fall armyworm Spodoptera frugiperda
To improve the control effect of microbial insecticides against fall army worm Spodoptera fru-giperda,three types of insect pathogenic fungi,including Beauveria bassiana strains IPPB343,IP-PB1237,and Metarhizium anisopliae strain IPPM330189,in addition to two kinds of insect viruses,S.litura nuclear polyhedrosis virus(SLNPV)and Mamestra brassicae nuclear polyhedrosis viruses(MB-NPV),along with one species of insect bacteria Empedobacter brevis were utilized.Nine pesticide com-binations,including fungi+bacteria and fungi+viruses,were established.The toxicity and field control effects of six microbial insecticides used individually and in different combinations of pesticides against S.frugiperda larvae were evaluated.The results showed that compared to the use of six microbial insecti-cides alone,all nine mixed combinations exhibited enhanced toxicity level and field control effectiveness against S.frugiperda.Seven days post-application,the combination of M.anisopliae IPPM330189 and MBNPV displayed the best control effect,achieving an 88.75％field control rate with a synergistic toxic-ity index of 23.78.Furthermore,the combination of M.anisopliae IPPM330189 and E.brevis suspension achieved an 87.45％control rate with a synergistic toxicity index of 21.72.These results indicated that the mixed use of microbial insecticides significantly enhances control efficacy against S.frugiperda in the field.
万方数据
维普
