INVESTIGATIONS ON THE PEST SCENARIO, THEIR NATURAL ENEMIES AND PESTICIDE USAGE PATTERN IN THE IRRIGATED CHILLI ECO-SYSTEM OF RAICHUR
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Date
2015-06-30
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UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR
Abstract
Fixed plot survey was conducted for various insect pest incidence in selected locations of
Raichur taluka during kharif 2014. Population of thrips was maximum during 29th standard
week in all locations surveyed. Whereas, mites population varied from village to village.
Mean damage due to gall midge, fruit borers was negligible along with predatory population.
A total number of insecticide applications ranged between 15-16 with a spray interval of 7-8
days in Nelahal and Dinni villages and was 16-18 sprays with 4-7 days spray interval in
Matamarri and Pesaldinni villages. Number of insecticides used, total number of sprays and
spray interval remained similar for last two years. Majority of the farmers used higher dosage
of insecticides than the recommended dosage. Chemical combinations (insecticides and
fungicides) tested for physical stability in terms of emulsion stability and phytotoxicity did
not reveal any phytotoxicity and were compatible. The study on biology of Scirtothrips
dorsalis (Hood) revealed that thrips to insert eggs in leaf tissue near the midrib and side
veins. The incubation period was 5.6 ± 0.71 days. It has two nymphal instars, pre - pupa and
pupa with duration of 2.44 ± 0.51, 3.44 ± 0.51, 2.44 ± 0.51 and 3.92 ± 0.81 days,
respectively. The longivity of male and female was 4.57 ± 0.42 days and 6.70 ± 0.37 days,
respectively. Pre-oviposition, oviposition and post-oviposition periods were 3.1 ± 0.51, 7.23
± 1.40 and 1.87 ± 0.35 days, respectively and the average fecundity was 15.30 ± 1.71 eggs.
The total life cycle was 18.52 ± 2.00 days.
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