Relative efficacy of diafenthiuron (50 WP) alone and with two different adjuvants against adult and egg stages of tea red spider mite, Oligonychus coffeae (Nietner) under laboratory condition

Two different dosages (0.125 g/l and 0.25g/l) of diafenthiuron (50 WP), alone and with adjuvants i.e. karanj oil (1%) and citronella oil (1%) in presence of surfactant (APSA 80% a. i.) were evaluated for their efficacy against adult females and eggs of tea red spider mite, Oligonychus coffeae (Nietner) under laboratory condition. The best efficacy was registered with the application of diafenthiuron alone (0.5gm/l). Karanj oil and citronella oil in solo application were not effective. Half and half of half of the recommended dose (0.25 g and 0.125 g) of the test chemical in combination with adjuvants showed promising result up to five days after treatment. Adjuvant combinations were also moderately effective against egg stages (33.91% and 43.19% mortality).