YIELD LOSS DUE TO SUCKING PESTS AND MANAGEMENT OF EARLY SEASON SUCKING PESTS THROUGH STEM APPLICATION TECHNIQUE ON COTTON
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Date
2013
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ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD
Abstract
Studies on “Yield loss due to sucking pests and management of early
season sucking pests through stem application technique on cotton” were
taken up during kharif 2012 to determine the yield losses and management of
sucking pests in cotton. Estimation of yield losses due to sucking pests viz.,
leafhoppers, aphids, thrips and whiteflies in Jaadoo and RCH-2 Bt cotton
hybrids was done with two treatments under protected and unprotected
conditions with 13 replications in paired plot technique.
Population of leafhoppers and thrips are high in RCH-2 Bt cotton hybrid
where as aphids and whiteflies populations are high in Jaadoo. Among the two
Bt cotton hybrids, jaadoo showed relative resistance to leafhoppers and thrips
while RCH-2 showed susceptibility reaction towards leafhoppers.
Among the Bt cotton hybrids; Jaadoo recorded lowest yield loss (26.32%)
and RCH2 recorded highest yield loss (48.89%) due to sucking pests.
Studies on management of early season sucking pests through stem
application technique on L 761 cotton revealed that among the different
insecticides tested, imidacloprid 1:10 was effective with higher per cent
reduction of aphid population over control at 3 days after treatment.
Monocrotophos 1:4 was effective in managing leafhoppers population. With
reference to thrips and whiteflies, maximum reduction was recorded in
Monocrotophos 1:2 treated plot. Monocrotophos 1:4 recorded maximum plant
height and more leaf width & leaf length compared to other treatments.
Seed cotton yield ranged from 15.18 to 9.76 q/ha with highest yield
recorded in monocrotophos 1:4 and which was on par with that of acephate 1:4
(14.27 q/ha), monocrotophos 1:3 (13.77 q/ha), imidacloprid 1:10 (12.81 q/ha),
monocrotophos 1:2 (12.50 q/ha) and imidacloprid 1:15 (12.10 q/ha).
Monocrotophos 1:4 recorded highest per cent increase (55.53) over
control while imidacloprid 1:20 least percent increase over control (7.17).
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Keywords
YIELD, LOSS DUE, SUCKING, PESTS, MANAGEMENT OF EARLY SEASON SUCKING PESTS THROUGH STEM, APPLICATION, TECHNIQUE, COTTON