Population Dynamics of Fall Armyworm, Spodoptera frugiperda (J. E. Smith) on Sorghum

Abstract

The study on seasonal incidence of fall armyworm was carried out during kharif, 2019 at Agricultural college farm, Bapatla. The oviposition of fall armyworm was observed from 34th SMW (Standard Meterological Week) and reached its peak during 40th SMW (0.03 egg masses plant-1). The larval population of fall armyworm was commenced during 35th SMW and increased gradually to a peak of 1.67 larvae plant-1 during 41st SMW. The maximum plant infestation (60.00%) and leaf damage severity rating (3.13) of fall armyworm was observed during 41st SMW. The peak activity of natural enemies was observed during 41st SMW which coincides with the larval population of fall armyworm. The correlation analysis indicated that eggmasses of fall armyworm was positively correlated with minimum temperature(r= 0.668) and wind speed (r= 0.529) while, the larval population showed significant positive correlation with maximum temperature (r= 0.029). The plant infestation caused by fall armyworm had shown significant negative correlation with maximum temperature (r= -0.633) and positive correlation with morning relative humidity (r= 0.678) and evening relative humidity (r= 0.664) whereas, the leaf damage severity rating exhibited significant positive correlation with evening relative humidity (r= 0.691). The multiple regression analysis revealed that the influence of weather parameters on the incidence of fall armyworm and natural enemies in sorghum ecosystem was more than 65% and 40%, respectively.

Population Dynamics of Fall Army Worm, Spodoptera Frugiperda (J E Smith) Infesting Maize

“…The present results agree with those of Ahir et al (2017), Brahman et al (2018) and Parmar (2020), on S. litura which showed negative and significant correlation with rainfall. The larval counts and % leaf damage of S. frugiperda were positively correlation with maximum temperature (Sunitha et al, 2021;Alam et al, 2022). In temperate states of North America, S. frugiperda arrives seasonally and then dies out in cold winter.…”