Identification of Newer Insecticides and Plant Extracts against Whitefly for Integration in Disease Management Modules in Brinjal
2022
Thilagam, P | Dinakaran, D | Nanthakumar, S
Efficacy of eight insecticides along with five plant extracts were tested during rabi 2017–18 and kharif 2018–19 at Agricultural Research Station, Virinjipuram, Vellore, Tamil Nadu. Four applications of treatments viz., acetamiprid 20 SP @ 30 g ai ha⁻¹, imidacloprid 17.8 SL @ 44.5 g ai ha⁻¹, spiromesifen 240 SC @ 120 g ai ha⁻¹, thiacloprid 240 SC @ 120 g ai ha⁻¹, thiamethoxam 25 WG @ 50 g ai ha⁻¹, diafenthiuron 50 WP @ 250 g ai ha⁻¹, dimethoate 30 EC @ 300 g ai ha⁻¹ and profenophos 50 EC @ 300 g ai ha⁻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 (3.0 Nos. per 3 leaves) was found to record the lowest population of whitefly throughout the crop period followed by thiacloprid (3.3 Nos. per 3 leaves) and thiamethoxam (3.4 Nos. per 3 leaves). The highest population reduction of 79.2, 77.6 and 76.8% was achieved in plots treated with spiromesifen, thiacloprid and thiamethoxam, respectively, over untreated check. With respect to viral disease, spraying of spiromesifen recorded the least incidence of mosaic (4.4%) followed by thiacloprid (5.2%), thiamethoxam (5.9%) and azadirachtin (6.2%). The plots treated with spiromesifen, thiacloprid and thiamethoxam recorded the highest fruit yield of 28.8, 28.0 and 27.2 t ha⁻¹, respectively, with 36.6, 32.9 and 29.3% increase over untreated check and also the highest cost: benefit ratio.
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