Evaluation of biorationals and insecticides against coconut rugose spiralling whitefly (Aleurodicus rugioperculatus Martin)

Palms treated with T7–Soap nut @ 1 per cent recorded minimum incidence of coconut rugose spiralling whitefly (17.2%), which was significantly superior over T10–Untreated control (34.5%) and found at par with T2- Lambda cyhalothrin + starch solution @1 per cent (20.5%), T3- Deltamethrin + starch solution @1 per cent (21.1%), T1- Imidacloprid + starch solution @1 per cent (21.9%), T8- Soap water (23.3%), T4- Buprofezin + starch solution @1 per cent (24.1%), T5- Pongamia oil + starch solution @1 per cent (26.4%), T6- Lecanicilium lecanii (26.5%) and T9- Water spray (29.1%). The minimum RSW intensity (9%) noticed in T7 was at par with rest of the treatments and found significantly superior over T10 (23%). The T7 treatment recorded minimum RSW populations (21.5 nos) followed by T2 (23.7nos) and was found significantly superior over T10 (41.6 nos). Highest Encarsia parasitism and natural enemies (predators/spiders), respectively were found in T10 (40.7% and 2.1 nos) and was par with T9 (35.6% and 1.75 nos.), T8 (32.7% and 1.48 nos.) and T7 (29.2% and 1.53 nos.).