Vol. 10, Issue 10 (2021)

Author(s):
Phani Kumar K, Mohan Vishnuvardhan K, Kamakshi N, Dakshina Murthy K and Mohan Rao K

Abstract:
Fall armyworm, Spodoptera frugiperda (J. E. Smith), is an exotic and most destructive pest causing potential damage to maize crop in India. The experiment was carried out at MRC, Vijayari during rabi, 2018-19 and Kharif, 2019 to find out the field efficacy of chlorantraniliprole at different doses against fall army worm in maize. Chlorantraniliprole at 100ml, 150ml, 200ml and 250ml/ha along with two commercial standards (lambda-cyhalothrin + thiamethoxam@ 125ml/ha and Carbofuran 3G@ 33kg/ha) were evaluated along with untreated control in the present study. The results of two years of field trial against fall armyworm infestation in maize showed that chlorantraniliprole reduced the number of infested whorls (percent plant infestation) below that in the untreated control and lambda-cyhalothrin+ thiamethoxam and carbofuran at 7 & 14 days after spraying. Highest reduction in percent of mean plant infestation (% ROC) of 84.52 & 83.24 over control was recorded in chlorantraniliprole @ 250 ml and 200 ml/ha after 2^nd spraying respectively. Foliar damage was recorded from plants in single middle row at 7 & 14 days after spraying based on mean whorl feeding injury in terms of visual score on 0-9 scale given by Davis and Williams 1992. Mean foliar damage was significantly lower with a scores of 1.4 and 1.2 at higher doses of chlorantraniliprole @ 250 ml and 200 ml/ha treated plots compared to other treatments viz., thiamethoxam 12.6% + lambda-cyhalothrin 9.5% ZC and carbofuran 3% CG including untreated control, resulted in significantly higher yields. These results indicate that chlorantraniliprole @ 200ml and 250ml/ha are significantly effective against fall armyworm than other insecticides tested without showing phytotoxicity.