BIOLOGICAL EFFICIENCY OF INSECTICIDES ON CUT WORM CATERPILLAR Agrotis ipsilon (LEPIDOPTERA: NOCTUIDAE) IN POTATO (Solanum tuberosum) IN CERRO PUNTA, BUGABA. 2003.

Abstract

The cut worm Agrotis ipsilon is one of the plague insects of greater importance in the vegetables cultivation of transplant and in potato crop, by the wastage that produces in the number of stems, reducing significantly the number of plant and attack several the yields. In studies of susceptibility of A. ipsilon in Cerro Punta, present susceptibility a indoxacarb, cipermethrin and permethrin; for this reason, this investigation work had as objective to determine at greenhouse level the biological efficiency of insecticides used in the potato cultivation and the efficiency of a new molecule. For this was used a design of BCA with three repetitions and seven treatments, indoxacarb to dose of 62.5, 125 and 187.5 g of i.a./ha; cipermethrin to 210 g of i.a./ha there has, permethrin to 275 g of i.a./ha; the mixture of metamidophos (300 g of i.a./ha) and cipermethrin (105 g of i.a./ha) and a witness without insecticides. It was used the variety Granola, a tuber by handle, and of four to nine stems by handle. To each handle were put to 10 cutworm caterpillars of A. ipsilon. The evaluated variables were, the number of dead caterpillar, % of efficiency, Number of cut stems, crop yied, and numbers of tubercle. The evaluation was accomplished to 24 and 48 hours after applied the treatments. It was accomplished the variance analysis, the multiple ranges test of Duncan, and the regression and correlation analysis of the data. lt was found meaningful differences (P= 0.0189) between the insecticides in the number of dead caterpillar and the efficiency of the insecticides to 24 hours and differences highly meaningful in the number of dead caterpillars and the efficiency of the insecticides to 48 hours (P= 0.0006). The indoxacarb to 24 and 48 hours presented the percentage of highest efficiency, with 73 and 80 percent respectively, surpassing to the cipermethrin, permethrin and the mixture. The indoxacarb in the three used dose, showed be but effective in the control of cutworms that the cipermethrin and the permethrin; however, efficiency was not by above of the 80%.