Bioefficacy of cypermethrin and decamethrin against leucinodes orbonalis guenee and their residues in brinjal fruits
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Date
2010
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Publisher
CCSHAU
Abstract
A Field experiment was carried out during summer season of 2009 at the Research Area of
Department of Entomology, CCS, Haryana Agricultural University, Hisar to evaluate the bioefficacy of
cypermethrin at (17.5, 26.25, 35 g a.i. acre-1) and decamethrin at (5.6, 8.4, 11.2 g a.i. acre-1) against
brinjal shoot and fruit borer (Leucinodes orbonalis Guenee) on brinjal var. BR-112. The first
application of each insecticide was done 49 days after transplanting followed by second application
after 10 days. All the treatments were significantly better than the control. The shoot damage was found
lowest (3.1%) in decamethrin @11.2 g a.i. acre-1. The mean fruit damage on number and weight basis
was also minimum (27.7% and 31.3%), respectively, in decamethrin @ 11.2 g a.i. acre-1treated plots.
The larval population varied from 1-7 in the various treatments with the lowest in decamethrin @ 8.4
and 11.2 g a.i. acre-1.
Double application of two synthetic pyrethroids viz., cypermethrin@ 17.5 and 35 g a.i. acre-1
and decamethrin@ 5.6 and 11.2 g a.i. acre-1 were applied on brinjal and the residues were determined
on fruits at harvest at different time intervals. The initial deposits of cypermethrin@ 17.5 and 35.0 g a.i.
acre-1 were 0.600 and 1.095 μg/g and decamethrin@ 5.6 and 11.2 g a.i. acre-1 were 0.430 and 0.900
μg/g, respectively. The half life values calculated were 2.41, 2.55 days for 17.5, 35 g a.i. acre-1
cypermethrin and 1.31, 1.48 days for 5.6, 11.2 g a.i. acre-1 decamethrin. The residue levels were found
to be below MRL at 3day for cypermethrin and 7 day for decamethrin.
Description
Keywords
Weeds, Control methods, Heterocyclic compounds, Soybeans, Yields, Crops, Drying, Planting, Herbicides, Grain