EFFECT OF BIO-RATIONALS AGAINST THE THRIPS, SCIRTOTHRIPS DORSALIS HOOD AND FRUIT BORER, HELICOVERPA ARMIGERA HUBNER INFESTING CHILLI
Journal Title: International Journal of Agriculture Sciences - Year 2016, Vol 8, Issue 12
Abstract
Field experiment was carried out to test the effectiveness of bio-rationals against thrips, Scirtothrips dorsalis Hood and Helicoverpa armigera Hubner on chilli with nine treatments including an untreated check. Thrips population was the lowest in spinosad 45 SC @ 0.4ml l-1 (0.60 / leaf) which was on par with emamectin benzoate 5 SG @ 0.4g l-1 (0.65 / leaf) and found to be superior to the standard check (dimethoate 30 EC @ 2ml l-1). Similarly, spinosad 45 SC @ 0.4ml l-1 and emamectin benzoate 5 SG @ 0.4g l-1 recorded the lowest larval population of H. armigera of 0.51 and 0.55 / plant. The next effective treatments were Beauveria bassiana @ 1 x 108 spores ml-1 and neem oil 3 % which recorded thrips population of 1.06 and 1.18 / leaf. With regard to fruit borer, Bacillus thuringiensis var. kurstaki @ 1 kg/ha (0.85 larvae / plant) ranked next to spinosad 45 SC and emamectin benzoate 5 SG. Similar trend was noticed with regard to leaf curl damage by thrips and per cent fruit damage by H. armigera. The highest yield of dry chilli fruits 1480 kg ha-1 was registered in spinosad 45 SC @ 0.4ml l-1, which was on par with emamectin benzoate 5 SG @ 0.4g l-1 (1420 kg ha-1) with respective additional income of Rs. 28,200 and Rs. 24,600. The highest cost benefit ratio (1:4.09) could be obtained in spinosad 45 SC @ 0.4ml l-1 followed by 1:3.97 in case of emamectin 5 SG @ 0.4g l-1.
Authors and Affiliations
A. RAVIKUMAR
Keywords
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