Hojas de chan (Hyptis suaveolens) para el control de Sitophilus zeamais y Zabrotes subfasciatus

Abstract

The objective of this work was to evaluate the effect of chan leaves on the survival of Sitophilus zeamais in maize and Zabrotes subfasciatus in bean seeds, during year 2007, between the months of May through September in the city of Leon, Nicaragua, at 129 MASL and an average temperature of 29 degrees C. Bean seeds of the DOR 364 variety and maize seeds NB-6 were used. Chan leaves of similar size were taken from the middle of the plants toward the top tier, collected before flowering, dried for three days in a solar dryer, and then pulverized. The experimental units consisted of plastic bottles of 172.2 g capacity and dimensions of 7.5 cm in diameter and 8 cm high, to which 100 g of corn or 100 g of beans were added. The treatments consisted of the addition of dried leaf chan powder in six doses: 0, 5, 10, 15, 20, and 25 grams per 100 seeds. Twenty adult beetles selected randomly and without sexing were added to the jars. The variables measured in beans and corns were: number of dead insects, number of grains perforated, number of adults emerged from the kernels and grains weight. The powdered leaves of chan only had effect on the mortality of S. zeamays.