Seasonal incidence and screening of soybean cultivars and efficacy of chlorantraniliprole 18.5 SC against major insect pests
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Date
2013-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present investigation was carried out during kharif 2011 and 2012 at Norman E. Borlaug Crop Research Centre, G.B. pant University of Agriculture and Technology, Pantnagar situated in Tarai region of Uttarakhand. The study incorporates the results on the pest complex, relative abundance and seasonal incidence of insect pest of soybean and screening of some germplasm against major insect pests of soybean. Besides, the efficacy of a newer insecticide, chlorantraniliprole 18.5 SC (Coragen) was also tested against the soybean defoliators viz., Spilarctia obliqua, Spodoptera litura and Thysanoplusia orichalcea and the borer, Riptortus
linearis. Considering the pest complex of soybean in the present study the order Hemiptera occupied the largest number of species constituting about 37% of the total pest, followed by Lepidoptera (25%), Coleoptera (25%), Diptera (6%), Orthoptera (2%) and others (5%). A total of seventeen insect pests were found to attack soybean crop belonging to three categories viz., defoliators (7 species), sap sucker (8 species) and borer (2 species). Among the various insect pest of soybean, Melangromyza sojae (borer) has been reported to be most predominant followed by Bemisia tabaci (sap sucking). Out of 43 cultivars screened against 7 major insect pests of soybean the cultivars JS-20-34 and AMS-MB-5-18 were identified to be resistant and AMS-MB-5-18, CSB-08-09, CSB-08-08, RKS-63, JS-20-29, DSb-20, MACS-1281, JS(SH)2003-8, SL-794 and MACS-
1140 were identified as the moderately susceptible (MS) against defoliator pests. CSB-08-09 was observed to be resistant to stem fly infestation but highly resistant to B.tabaci. The KDS-344 was found to be highly resistant against borer viz., Obereopsis brevis. Chlorantraniliprole 18.5 SC has been found effective against the defoliators viz., S. obliqua, S.litura and T.orichalcea and the borer, R.linearis over control. However, this
insecticide appeared to be most promising to combat the larval population of T.orichalcea. The cultivars PS-1466, PS-1477, DS-12-5 and SL-795 were found to be resistant and high yielding during present study.
Description
Thesis-PhD
Keywords
seasonal behaviour, screening, soyabeans,Chlorantraniliprole, insect pests, seasonal abundance, pest control