Evaluation of Hexythiazox 5.45 EC against red spider mite Oligonychus coffeae nietner on tea

The results revealed that, hexythiazox 5.45 EC was very effective against O. coffeae in tea. The highest dose i.e. 50 g a.i. ha⁻¹ was found very effective against the pest but not statistically superior to its lower doses 30 and 25 g a.i ha⁻¹. Hexythiazox @ 50 g a.i ha⁻¹ recorded an average per cent reduction of 74.47 and 64.66 per cent mite population at Iyerpadi estate and Lower Paralai estate, respectively. Hexythiazox @ 30 g a.i. ha⁻¹ was equally effective which recorded a cumulative mean reduction of 71.88 and 56.69 per cent mite population at Iyerpadi estate and Lower Paralai estate, respectively. The recommended dose of hexythiazox @ 25 g a.i. ha⁻¹ was also on par with the two higher doses and registered an average per cent reduction of 70.73 and 52.91 per cent mites in first and second field experiments, respectively.