STUDIES ON COMPATIBILITY OF CHEMICALS AGAINST DIAMONDBACK MOTH, Plutella xylostella L. (LEPIDOPTERA: PLUTELLIDAE)
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Date
2013-02
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University of Horticultural Sciences, Bagalkot (COLLEGE OF HORTICULTURE, MUDIGERE)
Abstract
The survey was conducted in 10 major cabbage growing villages of
Chikmagalur district. Cabbage growers have practice of mixing agrochemicals in large.
On an average, farmers spray agrochemicals 8 times during the cropping period.
Farmers who have higher education and self-satisfied families are willing to adapt the
recommended practices. Cabbage growers have been using 16 insecticides, 7 fungicides
and 3 plant growth regulators (PGR). Seven insecticides, one plant growth regulator
and one fungicide were selected after statistical analysis to test the compatibility and
efficacy of these selected agrochemicals against diamondback moth (DBM), Plutella
xylostella L. in laboratory. The median lethal concentration (LC50) and median lethal
time (LT50) of seven insecticides increased with gradual decrease in concentration.
The lowest LC50 (7.21 ppm) and LT50 (27.58 h) was observed in chlorantraniliprole
treatment. The cumulative larval mortality was highest (100 %) in chlorantraniliprole
after 42 hours at 23.125 ppm. Among seven insecticides in combination with fungicide
Saaf® tested for efficacy, five insecticides (chlorantraniliprole, flubendiamide,
novaluron, Proton® and profenophos) showed synergistic effect, whereas two
insecticides (indoxcarb and Hamla®) were antagonistic against P. xylostella larvae.
All seven insecticides in combination with PGR (Energy®) showed synergistic effect
against P. xylostella larvae. The combination of flubendiamide and Energy® was
comparatively more toxic (7.09 relative toxicity) than other combinations.