GS Chandrashekar, HP Maheswarappa, Manjunath Hubballi, Jilu VS, Sudarshan GK and Basavaraju TB

Among various control tactics evaluated against Red palm weevil (RPW), Rhynchophorus ferrugineus Olivier (Coleoptera: Curculionidae), chemical control is necessary immediate and dependable way of recovering infested coconut palms. In the present study, we have evaluated few chemicals against RPW at Karnataka. Coconut palms were selected at random, based on visual symptoms. An experiment was carried out at Bidarammanagudikaval in farmers’ field, 25 km away from Horticulture Research and Extension Centre, All India Co-ordinated Research Project on Palms, Arsikere, Hassan district, Karnataka state during the year of 2014-15 and 2015-16. Studies on assessment of insecticides against the red palm weevil, Rhynchophorus ferrugineus are being carried out with four chemicals i.e., Imidacloprid 17.8 SL (0.5 ml + 500 ml of water), Indoxacarb 14.5 SC (2.0 ml + 500 ml of water), Chlorantraniliprole 18.5 SC (2.0 ml + 500 ml of water), Carbosulfan 25 EC (2.5 ml + 500 ml of water) and an untreated control. The pre-treatment observations were recorded before imposing the chemicals. The chemicals have been imposed on the affected palms once in a month through crown region as well as through bored hole by weevil on trunk portion. A post treatment observation was recorded at three and six month’s intervals. Simultaneous observations were also made in control plot. The results indicated that palms have recovered to the extent of 88.14% by the application of chemical Chlorantraniliprole 18.5 SC followed by the application of Indoxacarb 14.50 SC 81.25 %, Imidacloprid 17.8 SL 60.39 % and Carbosulfan 25 EC 42.22 % have superior in controlling the infestation of red palm weevil to coconut by their recovery percentage over the untreated control.

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