STUDIES ON THE MANAGEMENT OF SERPENTINE LEAF MINER, Liriomyza trifolii(Burgess) (DIPTERA : AGROMYZIDAE) ON COTTON
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Date
2001-08-06
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
Studies undertaken on the nmnagenient of serpentine leaf miner Lirioniyza trifolii on
cotton during 1997-98 and 1998-99 season revealed that cotton plants infested from sowing time
and plants exposed for infestation from 10 and 20 DAS recorded significantly higher percentage
of infestation which resulted in vegetative and reproductive growth loss. Early stage (upto 20
days) infestation of SLM resulted in a loss of 45.75 per cent. Studies on host plant resistance
revealed that G. arhoreiun and G. herbaceuin genotypes recorded significantly lower incidence
and maggot population of SLM compared to G. hirxutuin , G. barhadence and hybrids. Less
preference of some genotypes was beciurse ofpresence of small thin lobed leaves, higher number
of trichomes, less amount of proteins and reducing sugars. Sensitivity studies indicated that among
the four locations the maggots collected from kasbe camp(high pesticide impo.scd area) were less
.sensitive to all the in.secticides. Imidacloprid was superior over all the insecticides in inducing the
mortality of maggots. The LC50 value was highest in maggots collected from kasbe camp for all
the insecticides which varied froin 0.2356 to 0.5463 g per litre in cotton being highest to endosulfan
and lowest to cypermethrin. Highest resistance ratio of 25.72 and 18.17 folds was recorded in
Kasbe camp and RRS cultures respectively to cypermethrin. The LC50 of ad.ult L. trifolii collected
from Kasbe camp varied from 0.39456 to 2.10670 |ig per ml.All the Irealments with castor trap crop recorded sgnificanlly lower incidence of SLM
and among them castor sown inbetween two cotton plants recorded significantly lowest incidence
and highest seed cotton yield . Seed treatment with imidacloprid 70 WS at 15g/kg of seeds
resulted in significant reduction in incidence and maggot population upto 17 DAS . Incidence of
SLM was significantly lower in biointensive IPM module(M-l) and after lODAS it performed
on par with adoptable IPM molule {M-2) & it was highest inRPP module (M-3). All the three
modules did not exhibit any significant difference in recording the seed cotton yield. Anlaysis of
cost effectiveness of modules revealed higher licnefits from adoptable 1PM module followed by
biointensive 1PM module and it was least in recommended pakage of practices
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