Eficacia del aldrin, dieldrin y heptachlor en el combate del picudo del tubérculo de la papa, Premnotrypes vorax (Huctache) (coleóptera: Curculionidae) en Ecuador

Abstract

A test was conducted at Chimborazo province, Ecuador, on control of the Irish potato weevil, Premnotrypes vorax (Huct.), one of the principal insect pest of this crop The insecticides tested were Aldvin, Dieldrin and Heptachlov at the rates of 5 and 7.5 pounds of technical material per hectare, as suspensions, under two different systems of application To the surface of the furrow and to the entive soil surface and worked into 6 inches by means of a hoe, before planting. The test was carried out under field conditions by means of a factorial split-plot design 3x3x2. At harvest time, results were measured as percent of damaged tubers and yields of the several treatments. The three insecticides proved to be effective in the protection of the tubers, with Heptachlor superior to Aldrin and Dieldrin. Nevertheless, on the yield basis, Heptachlor was inferior. The higher dosages are better than the lower. The more important fact is the high superiority of the applications to the furrow's surfaces before planting, compared with the entire soil surface applications.