Assessment of Yield Losses of the Fall Armyworm, Spodoptera frugiperda (J.E. Smith) in Rabi Maize (Zea mays L.)
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Date
2021
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MPUAT, Udaipur
Abstract
The present investigations on “Assessment of Yield Losses of the Fall
Armyworm (FAW), Spodoptera frugiperda (J.E. Smith) in Rabi Maize (Zea mays
L.)” was carried out at agronomy farm, Rajasthan College of Agriculture, MPUAT,
Udaipur during Rabi 2020-21.The FAW infestation was initiated in the first week of
November (44thStandard Meteorological Week, SMW). The adult male moth
population of FAW increased gradually and reached its peak population in the 3rd
week of February (8th SMW).
The pest showed a significant negative correlation with the maximum
temperature (r = -0.512*) whereas, significantly positively correlated with the
morning R.H. (r = 0.530*). The FAW population in maize followed a uniform/regular
type of distribution as evidenced by various dispersion indices. The local variety
registering a minimum population of FAW larvae followed by hybrid variety (AHC-
2595), Sweet Corn (Sugar-75), respectively.Under protected conditions, the highest
percent avoidable yield loss (38.45) was obtained from local variety followed by
sweet corn (38.20) and hybrid variety (AHC-2595) with 36.28%.
Spinetoram 11.7% SC @ 0.03% was found highly effective in reducing larval
population of FAW, the next best treatment was emamectin benzoate 5% SG @
0.049%.Among biopesticidesAzadirachtin @ 1% was found highly effective in
reducing the larval population of FAW. The highest yield (39.56 q/ha) was obtained
from the treatment of spinetoram11.7% SC@ 0.03% which was found statistically at
par with emamectin benzoate5% SG @ 0.049%.
The highest (1:9.33) ICBR was obtained from the treatment of emamectin
benzoate 5% SG @ 0.049 per cent followed by spinetoram 11.7% SC @ 0.03 per cent
(1:4.81). The highest (1:5.25) ICBR was obtained from the biopesticides NBAIR Bt
25@ 0.2 per centfollowed by Silica @ 2 per cent with (1:3.15) ICBR.
Description
Assessment of Yield Losses of the Fall Armyworm, Spodoptera frugiperda Rabi Maize
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Citation
Kumar R. and Babu R