Compatibility of Entomopathogenic Nematode (Steinernema sp.) and Coccinelid (Cheilomenes sexmaculata) with Insecticides registered against Fall Army Worm (Spodoptera frugiperda) in Corn

Abstract

Cyantraniliprole, Chlorantraniliprole, Emamectin benzoate, Spinosad, Flubendiamide, Teflubenzuron, Novaluron+Indoxacarb, Broflanilide, Chlorafenapyr and Azadirachtin are some important registered insecticides against S. frugiperda in corn. Bioagents such as entomopathogenic nematodes (EPNs) and lady beetles have also role to reduce its population. Integration of bioagents with chemical insecticides is current need for sustaianable pest management. So, the present evaluation was conducted at laboratory condition to knowhow the fate of EPNs, Steinernema sp. and coccinelid (Cheilomenes sexmaculata) after their exposure with above mentioned insecticides used for S. frugiperda. Lab research was conducted during spring (2021) at BCKV, Burdwan campus (West Bengal). EPNs was multiplied on larva of Corcyra cephalonica. Cheilonemes sexmaculata (grubs and pupa) was collected from field. Ten novel insecticides recommended for S. frugiperda were evaluated against the mentioned bioagents. Corected mortality data of EPNs and coccinelid was analyzed statistically and accordingly insecticides were grouped into different toxicity class. Except Emamectin benzoate, all the chemicals were proved to be safe to Steinernema sp. E. benzoate caused 100 % reduction to insect infectivity by EPN, followed by Chlorafenapyr (80 %). Slightly harmful effect for grubs (C. sexmaculata) was noted in Cyantraniliprole and Emamectin benzoate and for pupa in emamectin benzoate and Novaluron + Indoxacarb. Otherwise all others were harmless both for grubs and pupal stage of C. sexmaculata. These pieces of information might be practical in decision making for IPM of S. frugiperda.