Efficacy of Seed Treatment and Foliar Application of Against Soybean Stem Fly Melanagromyza sojae
Keywords:Soybean, Melanagromyza sojae, thiamethoxam 30FS, thiamethoxam 25WG, seed treatment, foliar application, stem tunneling, yield, C:B ratio
A field experiment on the effectiveness of seed treatment and foliar application of insecticides against
soybean stem fly Melanagromyza sojae (Zehntner) was carried out at the All India Coordinated Research
Project (AICRP) on Soybean, Gandhi Krishi Vignan Kendra (GKVK), Bengaluru, Karnataka during
kharif 2017. The seeds treated with thiamethoxam 30FS @ 10 ml/kg seed and foliar application of
thiamethoxam 25WG 0.40 g/ l at 30 days after germination (DAG) were found effective. It was on par with
seeds treated with imidacloprid 48FS @ 1.25 ml/ kg seed and foliar application of imidacloprid 17.8SL
@ 0.50 ml/l at 30 DAG. The plots treated with these gave higher grain yield of 1794.48 and 1678.89 kg/ha, respectively. Higher net gain of 1:4.22 was obtained from the seeds treated with thiamethaxom 30FS
@ 10 ml/kg seed and foliar application of thiamethoxam 25WG 0.40 g/l at 30 DAG; and it proved to be
highly cost effective. The foliar application of chlorantraniliprole 18.5SC @ 0.30 ml/l at 10 and 30 DAG
was equally effective compared to thiamethoxam and recorded the C:B ratio of 1:3.94. The plots treated
with quinalphos 25EC @ 2 ml/ l at 10 and 30 DAG led to the least stem tunneling of (26.73%) and the
low grain yield of 1177.78 kg/ ha.
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