Bioefficacy of fenpropathrin against tea red spider mite, Oligonychus coffeae Nietner at Terai, Darjeeling (West Bengal)

Relative efficacy of a synthetic pyrithriod, fenpropathrin 30 EC [IUPAC] name (RS) - a - cyano - 3 phenoxybenzyl 2,2,3,3 - tetramethylcyclopropane = carboxylate] along with two acaricides i.e. dicofol (18.5 EC), ethion (50 EC) and one broad spectrum acaro-insecticide profenophos (50 EC) was evaluated at 0.5, 0.75, 1.0, 2.5, 2.0 and 1.0 ml/l of water dosages respectively on a tea clone “TV₂₁” at Motidhar tea estate, terai, Darjeeling, West Bengal. Fenpropathrin 30 E.C. exhibited excellent control of tea red spider mite @ 0.75 and 1.0 ml/litre of water than conventional acaricides at recommended doses.