EVALUATION OF CERTAIN COTTON GENOTYPES AGAINST LEAFHOPPER, Amrasca devastans Dist. (CICADELLIDAE: HEMIPTERA) AND ITS MANAGEMENT THROUGH ECO-FRIENDLY APPROACH
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Date
2017
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Acharya N.G. Ranga Agricultural University
Abstract
Studies on “Evaluation of certain cotton genotypes against leafhopper,
Amrasca devastans Dist. (Hemiptera: Cicadellidae) and its management through ecofriendly
approach” were undertaken during Kharif, 2016-2017 at Regional
Agricultural Research Station, Lam, Guntur.
Fourteen cotton genotypes including one susceptible check were selected for
screening against leafhoppers and replicated twice in a simple Randomized Block
Design. The evaluation of different cotton genotypes against leafhopper under field
conditions revealed that, among all the genotypes, GISV-267 was resistant against
leafhoppers by recording the lowest damage injury index level (1.0-1.5 per cent )
harbouring mean population of only 5.3/3 leaves/plant and also recorded the highest
yield (18.5 q/ha). GSHV-173 genotype was also found promising with low leafhopper
population together with high yield.
Morphological and biochemical characters were studied for fourteen cotton
genotypes to asses the characters associated with tolerance or resistance to
leafhoppers. The study revealed that the genotypes with the highest hair density in
leaf lamina and midrib had exhibited the lowest leafhopper injury index and proved as
resistant genotypes against leafhoppers. The genotypes with higher quantity of
biochemical components such as tannins and phenols both at vegetative stage and
reproductive stage showed resistance or tolerance against leafhoppers.
The experiment for management of leafhoppers through eco friendly approach
was carried out in Randomized Block Design with seven treatments along with
control which were replicated thrice. Two each of botanicals, entomopathogens and
inorganic insecticides evaluated against leafhoppers infesting cotton. Among all the
treatments, thiacloprid + flubendiamide 480 SC was proved as significantly superior
over the other treatments in suppressing the leafhopper population both at 3 and 7
days after treatment by recording the highest reduction over control. The other
treatments in the order of efficacy in suppressing the leafhopper population are
thiacloprid 48 SC and azadirachitin 10000 ppm with more than 50 per cent reduction
in leafhopper population over untreated control.The entomopathogens Lecanicillium
lecani and Beauveria bassiana had exerted comparatively less efficacy in suppressing
the leafhopper population when compared to botanicals and inorganic insecticides.
Natural enemy population was more in the entomopathogens and botanical based
treatments which were found to be on par with control plots. The seed cotton yield
was highest from thiacloprid + flubendiamide 480 SC @ 0.4 ml / l (18.98 q / ha) but it
was found on par with thiacloprid 48 SC 0.3 ml / l (18.80 q / ha.) and azadirachitin
10000 ppm @ 1.5 ml / l (17.62 q / ha).
Description
D5418
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