BIOLOGICAL EFFICIENCY OF THE INSECTICIDE ZETA CIPERMETHRIN FOR THE MANAGING OF Plutella xylostella (L.) (LEPIDOPTERA: PLUTELLIDAE) IN CABBAGE. PANAMA. 2001.

Abstract

The “Moth diamond back” (Plutella xylostella) represents at present one of the limiting factors in the commercial cabbage production (Brassica oleracea var. Capitata). Within the chemical groups used for its manage, they have been observed important reductions of the populations of P. xylostella, with the utilization of piretroides, alternated with Bacillus thuringiensis. For this reason, the present study had as objective to evaluate the biological efficiency of two zed formulations cipermethrin in the managing of the moth diamond back (1.5 EW and 1.5 EC) using a design BCA with three repetitions. The evaluated treatments consisted of three doses of the zed formulations cipermetrina, compared with cipermethrin 20 EC, B. thuringiensis var. Kurstaki 3.5% and a witness without insecticide. The zeta formulations cipermethrin 1.5 EC to dose of 22.5 g i.a/ha, presented the greater number of cabbages of commercial quality, 1.5 EW 36 g i.a/ha, presented the average greater than commercial yield of quality one. In the variable commercial yield all the treatments surpassed to the witness. In the percentage of infestation to 25 ddt, the zeta cipermethrin EW and EC to dose of 36 g i.a/ha and 11.0 g i.a/ha, respectively, and also they presented the smaller percentage. The zeta cipermethrin 1.5 EW (36 g i.a/ha) presented the best control through the applications of the treatments.