Assessment of crop losses due to rice insect pests and management of yellow stem borer through pheromone traps
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Date
2004-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The experiments were conducted in Pusa Basmati rice at Crop Research Centre of G.B. Pant University of Agriculture and Technology to study the crop losses due to insect pest in rice and the role of sex pheromone in management of YSB. Damage of leaf defoliators were simulated and results indicated that 14.49 and 18.74 per cent leaf defoliation may be taken for economic injury level of defoliators and control measures should be initiated at 10.87 and 14.06 per cent defoliation, at 90 and 105 DAT. The stem borers damage was simulated artificially and the economic injury level was worked out under two series of conditions at 40, 50 and 60 DAT viz., in presence of natural white ears, the economic injury levels were determined to be 20.02, 9.7 and 5.19 per cent dead heart at 40, 50 and 60 DAT and the corresponding ETLs were 15.15, 7.27 and 3.89 per cent dead heart and in absence of natural white ears, the EILs were determined to be 16.72, 9.88 and 6.04 per cent dead heart and the corresponding ETLs were 12.59, 7.41 and 4.53 per cent dead heart at 40, 50 and 60 DAT, respectively. The pheromone lures manufactured by Biotech International Ltd, New Delhi and Pest Control India (Pvt.) Ltd., Mumbai were equally effective in mass trapping of YSB. Maximum population was observed on 7th and 8th October, 2003 (9.27 and 8.23 males/trap). The damage of YSB in pheromone trap installed plot remained below economic injury level and number of females and egg masses/hill also remained very low through out crop season. So, the mass trapping of male is effective in keeping the damage of YSB below EIL if installed @ 20 traps/ha keeping a distance of 20 and 25 m, respectively, between traps and rows.
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