Insecticides and plant extracts against Whitefly for Integrated disease management modules in Brinjal

Four applications of treatments viz., acetamiprid 20 SP @ 0.3 g l⁻¹, imidacloprid 17.8 SL @ 0.5 ml l⁻¹, spiromesifen 240 SC @ 1.0 ml l⁻¹, thiacloprid 240 SC @ 1.0 ml l⁻¹, thiamethoxam 25 WG @ 0.4 g l⁻¹, diafenthiuron 50 WP @ 1.0 g l⁻¹, dimethoate 30 EC @ 2.0 ml l⁻¹ and profenophos 50 EC @ 2.0 ml l⁻¹, azadirachtin 10000 ppm @ 3.0 ml l⁻¹, neem seed Kernel extract 5%, the leaf extracts of neem, Bougainvillea and sorghum/coconut at 10% along with an untreated check at one month interval on 30 day old plants were given. The results showed that spraying of spiromesifen 240 SC (3.05 Nos./3 leaves) was found to record the lowest population of whitefly throughout the crop period followed by thiacloprid 240 SC (3.28 Nos./3 leaves and thiamethoxam 25 WG (3.39 Nos./3 leaves). The highest population reduction of 79.16, 77.59 and 76.84% was achieved in plots treated with spiromesifen 240 SC, thiacloprid 240 SC and thiamethoxam 25 WG, respectively over untreated check. With respect to viral disease, spraying of spiromesifen 240 SC @ 1.0 ml l⁻¹ recorded the least incidence of mosaic (4.39%) followed by thiacloprid 240 SC @ 1.0 ml l⁻¹ (5.22%), thiamethoxam 25 WG @ 0.4 g l⁻¹ (5.87%) and azadirachtin 10000 ppm @ 3 ml l⁻¹ (6.22%). The plots treated with viz., spiromesifen 240 SC, thiacloprid 240 SC and thiamethoxam 25 WG recorded the highest fruit yield of 28.79, 28.01 and 27.24 tonnes ha⁻¹, respectively with 36.63, 32.93 and 29.28% increase over untreated check and also the highest Cost: Benefit ratio.