SURVEY AND MANAGEMENT OF THRIPS TABACI (LINDEMAN) AND SPODOPTERA SPP. ON ONION CROP IN HYDERABAD-KARNATAKA REGION

Loading...
Thumbnail Image
Date
2013-08-30
Journal Title
Journal ISSN
Volume Title
Publisher
UNIVERSITY OF AGRICULTURAL SCIENCES RAICHUR
Abstract
Investigations on the survey, dates of transplanting and management of insect pests of onion using chemicals were undertaken at the Main Agricultural Research Station, University of Agricultural Sciences, Raichur during kharif 2012-13. The maximum population of 26.11 thrips per plant was recorded in Bellary and minimum population at Raichur (18.38 thrips/plant) district. The highest incidence of defoliators were noticed in Bellary district 4.20 defoliators per plant. In Raichur district minimum incidence of 2.35 per plant were recorded. The spiders and coccinellids population ranged from 0.10 to 0.80 per plant respectively. The peak activity of T. tabaci on onion was noticed from July 15th onwards which recording highest population of 21.59 thrips per plant and minimum population during October 15th (13.37 thrips/plant) which were found to be optimum dates of transplanting. Whereas, highest incidence of defoliators was noticed in August 30th (0.81 defoliators/plant) and minimum incidence (0.31 defoliators/plant) was registered on October 15th dates of transplanting. Maximum natural enemies population viz., spiders and coccinellids were noticed during September and October. Seed treatment with imidacloprid 60 FS @ 9 ml/kg of seed followed by two sprays with thiamethoxam 25 WG @ 0.2 g/l and fipronil 5 SC @ 1 ml/l for thrips and one spray of chlorantraniliprole 18.5 SC @ 0.15 ml/l for defoliators and T6 (no seed treatment, one spray in nursery with imidacloprid 17.8 SL @ 0.3 ml/l and two sprays with fipronil 5 SC @ 1 ml/l and thiamethoxam @ 0.2 g/l and one sprays with chlorantraniliprole 18.5 SC @ 0.15 ml/l) afforded good control of thrips upto fifteen days after spraying and were superior to all other treatments and also were found to be effective in reducing the defoliators. Highest yield of (24.4 and 23.8 t/ha).
Description
Keywords
null
Citation
150
Collections