Evaluation of two trap designs to capture adults of the Opsiphanes cassina Felder ( Lepidoptera: Brassolidae) in an oil palm plantation | Evaluación de dos diseños de trampas para la captura de adultos de Opsiphanes cassina Felder (Lepidóptera: Brassolidae) en una plantación de palma de aceite

Within the oil palm plagues, the Opsiphanes cassina Felder (Lepidoptera: Brassolidae) has been gaining space and is being constituted into one of the most important entomological problems of the cultivation, causing serious defoliations and thus increasing the production costs, especially in the Central Zone plantations. One of the control methods for this plague is bases on the use of traps to capture the adults, of which, to types were evaluated in this study: the first one called fine sheer net trap, used greatly in the south of the Cesar Departament and the second one, known as the yellow trap with openings, used in the Puerto Wilches (Santander) region. Thirty of each type of these traps were installed in a plot on land planted with palms, intercalated every four palms, during a period of three generations of plague insects. Molasses with prices of pineapple were used as bait. The variables to be evaluated were: the total number of captures and the relation of sexes and fertility. Statistically, a " t " test was used, where the reproductions were the daily evaluations in the three cycles. In the first generation, a significant difference occurred in the number of females captured with a calculated value (C.V.) of 4.558 and probability of P>0,001. In the second generation a significant difference occurred in the total adults captured with a calculated value of 2,717 and a probability of > 0,005. In the number of females, the calculated value was 6,994 with a P< 0,001. In the third generation, as significant difference also occurred in the number of adults captured C.V. = 2,897 and P>0,005 as well as in the number of females C.V. = 4,910 with a P< 0,001. The fertility of the witness females was 51 eggs/ female, those of the fine sheer net trap was 34,5 eggs / female, and those of the yellow trap with openings was 36,5 eggs / female, this latter being the best for capturing the largest percentage of butterflies and, within this, the greatest number of females, a circumstance which is very positive in favor of this trap design.

Dentro de las plagas de palma de aceite, Opsiphanes cassina Felder (Lepidóptera: Brassolidae) ha venido ganando espacio y se está constituyendo en uno de los problemas entomológicos más importantes del cultivo, causando serías defoliaciones e incrementando los costos de producción, principalmente en plantaciones de la Zona Central. Uno de los métodos de control de esta plaga se basa en el uso de trampas para la captura de adultos, de las cuales en este estudio se evaluaron dos tipos: la primera, llamada de malla de tul, muy utilizada en el sur del Cesar, y la segunda, conocida como amarilla de piqueras, usada en la región de Puerto Wilches (Sant.). En un lote de palma se instalaron 30 trampas de cada una, intercaladas cada cuatro palmas, por un período de tres generaciones del insecto plaga. Como cebo se utilizó melaza más trozos de piña. Las variables a evaluar fueron: número total de capturas, relación de secos y fecundidad; estadísticamente se utilizó una prueba de ?t? donde las réplicas fueron las evaluaciones diarias en los tres ciclos. En la primera generación se presentó diferencia significativa en el número de hembras capturadas con un valor calculado (V.C) de 4.558 y una probabilidad P>0,001; en la segunda generación se presentó diferencia significativa en el total de adultos capturados con un valor calculado de 2.717 y una probabilidad >0,005; en el número de hembras, el valor calculado fue de 6.994 con una P0,005 así como en el número de hembras V.C =4.910 con una P