Bio-efficacy of fenazaquin 10 EC against two spotted spider mite, Tetranychus urticae Koch. (Acari: Tetranychidae) in tomato

H P MISRA

Abstract


A field trial was conducted at the Central Research Station Farm, Orissa University of Agriculture & Technology, Bhubaneswar during winter seasons of 2008-09 and 2009-10, using tomato variety Arka Vikas to test the bio-efficacy of fenazaquin 10EC against two spotted spider mite, Tetranychus urticae Koch. The results revealed that fenazaquin at 125 and 150 g a.i./ha registered significantly lowest mite population (3.5-4.8/4 cm2 leaf area) followed by dicofol at 250g a.i./ha at 10 days after spraying (DAS) during both the years of study. The highest population reduction was achieved (90.27-92.13%) with fenazaquin at 125-150g a.i./ha followed by dicofol at 250g a.i./ha and fenazaquin at 100g a.i./ha (76.40-76.81 %) compared to control. Plots receiving fenazaquin at 125 and 150g a.i./ha treatments recorded significantly highest fruit yield (18.9-19.2 t/ha) which was 30.0-32.1per cent more than control (14.5 t/ha). The selectiveness and safety of fenazaquin to predatory phytoseiid mites was observed at all doses evaluated.

Keywords


Fenazaquin, Tetranychus urticae, tomato

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