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Evaluation of management practices against bollworms and their effect on sucking pests in cotton

KrishiKosh

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Title Evaluation of management practices against bollworms and their effect on sucking pests in cotton
 
Creator Bhupender Singh
 
Contributor Saini, R.K.
 
Subject Management practices, Bollworms, Cotton, Intercropping, Neem, Trichogramma
 
Description Different pest management practices, namely, date of sowing,
Trichogramma chilonis release, intercropping with sesame, use of botanical
pesticides like neem, and chemical insecticides, were evaluated alone and in
combinations against bollworms of cotton during Kharif, 2004 at the Research
Farm of Department of Entomology, CCS Haryana Agricultural University,
Hisar. These practices were tested on cotton variety H-1117 in plot size of 48m2
keeping three replications and their impact on population of sucking insect pests
(i.e. leafhopper, whitefly and aphid) was also assessed. The studies indicated that
all management practices, either alone or in combinations, provided significantly
better control of bollworms than the control both on the basis of damage in green
fruiting bodies as well as open bolls. Minimum bollworms incidence was
recorded in treatments where insecticides were used either alone or in
combination with other management practices. Combined use of different
management practices other than chemical insecticides did not prove as effective
as chemical insecticides in controlling bollworms and increasing the yield of
seed cotton. However, these practices offered significantly greater reduction in
bollworms damage over the control. Further, their integration with insecticides
resulted in about 57 per cent reduction in insecticides sprays. Combined use of
different practices, i.e. intercropping of cotton with sesame + neem +
Trichogramma release significantly reduced bollworms damage than when these
practices were used alone.
There was 31.8, 21.5 and 4.1 per cent parasitization of Helicoverpa
armigera eggs by Trichogramma in treatments having intercropping with
sesame, weekly release of Trichogramma and control, respectively. Overall
bollworms damage in green fruiting bodies was highest (19.6%) in early sown,
followed by that in normal sown (14.65%) and late sown (9.61%) crop. On the
other hand, bollworms incidence in open bolls (on locule basis) was lower
(41.1%) in early sown than the late sown (49.6%) crop. Wider row to row
spacing of one meter was no better than 67.5 cm spacing in reducing bollworms
damage under late sown conditions.
 
Date 2016-12-01T09:43:20Z
2016-12-01T09:43:20Z
2005
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/88502
 
Language en
 
Format application/pdf
 
Publisher CCSHAU