Field and pot culture experiments were conducted Annamalai University, Tamil Nadu, India during 2012 - 2013 to evaluate the bio efficacy of certain botanical extracts, oils and acaricides against two spotted spider mite (TSSM) Tetranychus urticae (Koch) on okra. Vitex negundo leaf extract, Clerodendron inermea leaf extract, Wedelia chinensis leaf extract, Neem oil, Pungam oil, Pinnai oil, Illupai oil, NSKE, Dicofol and Fenezaquin were used for the study. The maximum mite population was observed in 5% W. chinensis leaf extract (15.08) sprayed plants followed by, 5% C. inermea leaf extract (13.95), 3% illupai oil (11.86) and NSKE 5% (11. 67) respectively. Amoderate mite population was observed in 5% V. negundo leaf extract (10.70), 3% pungam oil (10.05), 3% pinnai oil (9.53) and 3% neem oil (9.05) sprayed plants respectively. Whereas the least mite population was observed in dicofol 0.2% (8.13) and fenezaquin 0.2% (8.01) sprayed okra plants.
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Velmurugan et al. (2025) studied this question.
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