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Efficacy of aldrin, dieldrin, and heptachlor in the control of the potato weevil, Premnotrypes vorax in Ecuador



Efficacy of aldrin, dieldrin, and heptachlor in the control of the potato weevil, Premnotrypes vorax in Ecuador



Turrialba 12(1): 28-35



A test was conducted at Chimborazo province, Ecuador, on control of the Irish potato weevil, Premnotrypes vorax, one of the principal insect pests of this crop. The insecticides tested were aldrin, dieldrin and heptachlor at the rates of 5 and 7.5 pounds technical/ha, as suspensions, under 2 different systems of application: To the surface of the furrow and to the entire soil surface and worked in 6 inches by a boe, 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 were better than the lower. The more important fact is the superiority of the applications to the furrow's surfaces before planting, compared with the entire soil surface applications.

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