Evaluation of an encapsulated formulation of cyfluthrin to control Sitophilus oryzae (L.) on stored wheat

Hard red winter wheat was treated with 0.5, 1.0, 2.0, and 4.0 ppm encapsula ted cyfluthrin, stored at 20, 25, 30, and 35 degrees C for 8 months, and bi oassayed at bi-monthly intervals with adult Sitophilus oryzae (L.), the ric e weevil. Survival of parent S. oryzae and the number of F-1 adults was not related to temperature but was inversely dependent on concentration, and i ncreased as residues aged. Survival at 8 months was 70.5 +/- 7.5, 60.9 +/- 7.9, 33.1 +/- 6.8, and 12.2 +/- 4.8%, on wheat treated with 0.5, 1.0, 2.0, and 4.0 ppm cyfluthrin, respectively. An application rate of at least 2 ppm would be necessary to control S. oryzae for 10 months on stored hard red w inter wheat. Published by Elsevier Science Ltd.