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Action of a single application of aldrin, dieldrin, and heptachlor in the control of Barotheus castaneus in consecutive cultures of potatoes in Ecuador



Action of a single application of aldrin, dieldrin, and heptachlor in the control of Barotheus castaneus in consecutive cultures of potatoes in Ecuador



Turrialba 12(3): 140-145



Potato crops of the Ecuadorean highlands are mostly affected by insect soil pests. Larvae of Barotheus castaneus injure up to 6.5% of the Irish potato tubers besides damage caused to the roots. A field test of chemical control was conducted at Palmira, Chimborazo province, from November 1959 to July 1961, under a split-plot design 3 x 3 x 2, evaluating aldrin, dieldrin and heptachlor at the rates of 5 and 7.5 pounds of active ingredient per ha., with 2 systems of application, to the rows and to the entire soil surface. Results were measured in terms of larvae population at the first and second harvest at 8 and 20 months after the first and only spray. Results in both counts indicate that the 3 insecticides produce efficient control up to 20 months. Aldrin and dieldrin are equally effective and slightly better than heptachlor. Five and 7.5 pounds show no significant differences but are better than the check. The furrow applications are slightly more effective than the entire soil surface treatment, in spite of the fact that in the second planting the row's application method disappeared because of the pre-planting soil preparation. The comparison between the partial results obtained at 8 and 20 months, indicates that the insecticides, the two dosages and methods achieve approximately equal effectiveness with heptachlor and the furrow application system is slightly better up to 8 months than to 20.

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