Screening of genetically modified bt cotton hybrids against major insect pests
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Date
2009
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Publisher
CCSHAU
Abstract
To study the influence of genetically modified Bt cotton cultivars on
major insect pests, field experiments were conducted at CCS Haryana
Agricultural University, Hisar during kharif 2008. Twenty three Bt genotypes
viz., MRC-6025 Bt, NCS-950 Bt, VBCH-1504 BG-I, MRC-7045 BG-II,
AJEET-33 BG-II, PCH-406, NCS- 138 Bt, TULSI-4 BG- II, BULLET-707
BG-II, ANKUR-2226 BG-I, RCH-308 Bt, MRC-6029 Bt, RCH- 317 Bt, MRC-
6304 BT, RCH- 314 Bt, Sandeep SDS- 9, OM-333, MRC-7017 BG-II,
VBCH-1008 Bt, MRC-7041 BG-II, Vibha Seeds Ole-Bt and non-Bt genotypes,
one hybrid (HHH-223) and one variety (H-1226) were evaluated for their
reaction to sucking pests, bollworms and natural enemies. The experiments
were laid out under unsprayed conditions. The observations were recorded
by adopting standard sampling techniques.
The results indicated that no significant difference was recorded in
sucking pest (cotton leafhopper and whitefly) populations among all
genotypes. However, the incidence of bollworm remained significantly higher
in non-Bt genotypes than Bt genotypes. Bollworms infestation in
green fruiting bodies on Bt genotypes and HHH-223 were below ET
throughout the crop season and did not vary significantly. However, the
infestation in all genotypes ranged from 0.00-31.54 per cent under
unsprayed conditions. Bollworm (Earias spp.) population (larvae/plant) was
nil in Bt genotypes, while in non-Bt genotypes and minimum in HHH-223
under unsprayed conditions.
The infestation of pink bollworm (Pectinophora gossipiella) on boll and
locule basis was nil among Bt genotypes under all sets of conditions.
However, in non-Bt genotypes boll infestation ranged between 0.00-30.72
per cent under unsprayed conditions And on locule basis it was ranged
between 0.00-15.25 per cent under unsprayed conditions. Minimum
incidence of pink bollworm was recorded in HHH-223 both in boll basis and
locule basis. Bollworm infestation varied significantly in Bt and non-Bt
genotypes, being higher in non-Bt genotypes. Bollworm population
(larvae/boll) was nil among the Bt genotypes throughout the period of study.
Bollworm infestation on open boll basis in genotypes ranged from
0.67 – 27.82 per cent under unsprayed conditions, while on locule basis,
the infestation ranged from 0.33 – 13.82 per cent.
Populations of natural enemies were on par in different genotypes
during period of study under different sets of experiments. Yield of seed
cotton was significantly higher in Bt genotypes than non-Bt genotypes under
all sets of conditions.
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Keywords
Participation, Tillage equipment, Sugarcane, Biological phenomena, Manpower, Land resources, Alternative agriculture, Crops, Economic systems, Organic fertilizers