Biopesticides for integrated pest management in bitter gourd (Momordica charantia L.)
Loading...
Files
Date
2000
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Department of Agricultural Entomology, College of Horticulture, Vellanikkara
Abstract
A field study was undertaken at the College of Horticulture,
Vellanikkara during 1998-99 to compare the efficacy of two chemical
insecticides viz., acephate, carbofuran, two biopesticides based on B.
thuringiensis and B. bassiana and their combinations against the major
pests of bitter gourd. Carbofuran was applied as granules at seeding, while
the other treatments were applied as spray at fortnightly intervals from 35
DAS.
It was observed from the study that application of acephate at 0.1 per
cent was the most effective insecticide against sap feeders viz., leaf hopper
and aphids. The combined application of B. thuringiensis or B. bassiana
with acephate 0.05 per cent was also found effective. In controlling hadda
beetle also, acephate at 0.1 per cent gave consistently good results. Gallfly
infestation was minimum in acephate 0.1 per cent treated plots followed by
B. thuringiensis + acephate 0.05 per cent sprayed plots.
In the case offruitfly, B. bassiana + acephate 0.05 per cent registered
the lowest infestation. The borer infestation was less in B. thuringiensis +
acephate 0.05 per cent sprayed plots. This treatment also recorded the
highest marketable yield (7573 kg ha") with the highest net profit of Rs.
25,344 ha-I and benefit cost ratio of 3.71 : 1. Studies on the residues of
carbofuran by high performance liquid chromatography revealed that
application of carbofuran either at 0.6 or 1.2 kg a.i.ha' at seeding resulted
in no detectable terminal residue in bitter gourd fruits.
Description
PG
Keywords
null
Citation
171605