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Management of cotton sucking pests using biorationals

KrishiKosh

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Title Management of cotton sucking pests using biorationals
 
Creator Manu R.
 
Contributor R.S.Giraddi
 
Subject Agricultural Entamology
 
Description Field investigations were carried out to study the effect of organic amendments, with
two regimes of nitrogen (100% and 50%) and botanical pesticides against sucking pests of
cotton viz., leafhoppers, thrips, aphids and whiteflies during kharif 2004 at the Main
Agricultural Research Station, University of Agricultural Sciences, Dharwad.
Application of split dose of neem cake @ 500 kg/ha (250 kg/ha each at sowing and 30
days later) with 100% NPK and 50% N & 100% PK regime was found to be a promising
organic amendment in the management of cotton sucking pests, which resulted in to
significantly lower pest activity, optimal plant growth and higher kapas yield (6.28 and 6.12
q/ha). This was followed by one time application of neem cake @ 500 kg and neem cake
(250 kg) + vermicompost (1250 kg) per ha at sowing. However, the crop that received
chemical interventions (check) registered significantly lowest density of sucking pests and
highest kapas yield (7.20 and 7.19 q/ha). Comparatively, lower activity of sucking pests was
observed on the crop receiving organics with 50% N, 100% PK vis-a-vis 100% NPK and
organics.
Soil application of neem cake @ 500 kg/ha, 100% RDF superimposed with
nimbecidine sprays on the crop @ 5 ml/l emerged as the best treatment which recorded
significantly lower activity of sucking pests and higher kapas yield (8.16 q/ha), followed by
vermicompost @ 2500 kg/ha and sprays of nimbecidine @ 5 ml/l. While, the organics with
NSKE 5% and Vitex negundo leaf extract 5% were found to be moderate in their efficacy
against sucking pests.
Various organics and botanicals were found to be quite safe to predatory coccinellids
and chrysopids in cotton ecosystem, as evidenced by the normal activity, being comparable to
untreated crop. The chemical interventions significantly affected the activity of these
beneficials.
 
Date 2016-09-14T10:23:48Z
2016-09-14T10:23:48Z
2005
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/76566
 
Format application/pdf
 
Publisher UAS, Dharwad