INCIDENCE OF FALL ARMYWORM, Spodoptera frugiperda (J.E. SMITH) IN MAIZE AND THEIR MANAGEMENT THROUGH NEWER INSECTICIDES
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Date
2023-08-04
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BANDA UNIVERSITY OF AGRICULTURE & TECHNOLOGY BANDA-210001, UTTAR PRADESH (INDIA)
Abstract
The present investigations were carried out at PG Research Farm of College of
Agriculture, BUAT, Banda during Kharif 2022 for study the incidence of fall armyworm,
(S. frugiperda J. E. Smith) on maize and their management through newer insecticides.
The popular maize variety NHM-3899 was grown in 150m2 area for study of population
dynamics and 20m2 each plot size with 7 treatment and 3 replications for management. The
result revealed that the fall armyworm first noticed on seedling stage of the crop growth
and continued till maturity. The larval population of S. frugiperda appeared first in 33rd
Standard week (13th to 19th August) with its mean of 0.10 larvae plant-1and reached to its
maximum (6.92 larvae plant-1
) in 3
rd week of September (38th SW). The damage caused by
S. frugiperda was estimated in the term of per cent leaf damage, which ranged between
0.37 to 60.16 per cent with variability during crop growth stages. Among two predatory
species viz., coccinellids and spiders were prevalent and first noticed in 3
rdweek of August
(33rd SW) with the initial population of 0.16 grub & adult plant-1 and 0.28 plant-1
,
respectively with the occurrence of larval population S. frugiperda in field. The population
of coccinellids attended its peaks (1.12 plant-1
) in 36th SW, whereas the peak of spiders
(1.68 plant-1) was recorded in 38thSW and it was gradually increased with an increase of
the larval population fall armyworm and correlated significantly with a positive correlation
of r= 0.657 & r= 0.699, respectively. Among the weather variables, only rainfall (r=
0.623) had significant correlation with larval population of S. frugiperda. However, none
of the variables had shown significant correlation with per cent leaf damage. The
regression equation evident that all the parameters (predators and weather parameters)
jointly contribute 97 per cent abundance of larval population of fall armyworm, whereas
joint effect of both predators had 72 per cent influenced (72 per cent) while joint effect of
all the weather variables contributed only 57 percent abundance of larval population of fall
armyworm. Among tested insecticides, chlorantraniliprole 18.5SC @ 40g a.i. ha-1 followed
by spinetoram 11.7 w/w SC @ 30g a.i. ha-1 and emamectin benzoate 5 SG 20g a.i. ha-1
were found most effective against S. frugiperda that significantly reduced the larval
population and gave higher field bio-efficacy in maize. These three insecticides showed
81.98, 80.57 and 77.26 per cent larval population reduction, respectively over control. The
maximum yield (50.33 qha-1
) and net return (Rs.45959.31 ha-1
) were recorded from
spinetoram 11.7 SC followed by chlorantraniliprole 18.5 SC. However, the maximum C:B
ratio (1:8.58) was recorded from emamectin benzoate 5 SG treated plot.
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VIMAL KANAUJIYA{2023},INCIDENCE OF FALL ARMYWORM, Spodoptera frugiperda (J.E. SMITH) IN MAIZE AND THEIR MANAGEMENT THROUGH NEWER INSECTICIDES, BANDA UNIVERSITY OF AGRICULTURE & TECHNOLOGY BANDA-210001, UTTAR PRADESH (INDIA)