Efficacy of biopesticides and insecticides against Garlic thrips

Abstract

A field experiment was conducted at All India Co-ordinated Research Project on Vegetable Crops, Department of Horticulture, Mahatma Phule Krishi Vidyapeeth, Rahuri during Rabi 2014 and Rabi 2015 to evaluate the efficacy of biopesticides and insecticides against garlic thrips, Thrips tabaci Lind. The results indicated that, fipronil 5 SC @ 1.5 ml/L was the most potential treatment with least thrips population (5.58 thrips/plant) and recorded the highest garlic bulb yield (166.83 q/ha). It was followed by the treatments with prophenofos 50 EC @ 1.0 ml/L (6.00 thrips/plant) and thiamethoxam 25 WG @ 0.40 g/L (6.59 thrips/plant) which were at par with each other with garlic bulb yield of 164.22 and 161.65 q/ha, respectively. Among the biopesticides, Lecanicillium lecanii 1.15 WP (10.28 thrips/plant) and Metarrhizium anisopliae 1.15 WP @ 4.0 g/L, each (11.75 thrips/plant) maintained their superiority over untreated control (28.54 thrips/plant). However, Beauveria bassiana 1.15 WP @ 4.0 g/L (13.92 thrips/plant) found less effective as compared to other treatments. As regards to bio pesticide treatments, L. lecanii 1.15 WP @ 4.0 g/L recorded highest garlic bulb yield of 149.17 q/ha followed by the treatment with M. anisopliae 1.15 WP @ 4.0 g/L with garlic bulb yield of 146.53 q/ha and were at par with each other. The highest Incremental Cost Benefit Ratio (ICBR) was registered by prophenofos 50 EC @ 1.0 ml/L (1:73.49) and it was followed by acephate 75 SP @ 0.80 g/L (1:73.22), acetamiprid 20 SP @ 0.25 g/L (1:65.21), fipronil 5 SC @ 1.5 ml/L (1:51.11), thiamethoxam 25 WG @ 0.40 g/L (1:49.86) and Clothianidin 50 WDG @ 0.12 g/L (1:46.50). Among the biopesticides, the highest ICBR was recorded by L. lecanii 1.15 WP @ 4.0 g/L (1:59.39) which was followed by M. anisopliae 1.15 WP @ 4.0 g/L (1:56.25). Lowest ICBR of 1:37.50 was registered with B. bassiana 1.15 WP @ 4.0 g/L.