Determinación de la Actividad Insecticida de los Aceites Esenciales de Tagetes terniflora y Tagetes zipaquirensis en Brevicoryne brassicae.

Abstract

Insecticide activity against cabbage greenfly (Brevicoryne brassicae) of essential oils fiom the marigold plant species: Tagetes termiflora, Tagetes minuta, and Tagetes =ipaquirensis.

Biologists and farmers need truthful and tested information about bioinsecticides that can be used for future investigation and application.

The research focuses on 3 actions: to extract the essential oils from three marigold species, to determine their insecticide activity, to obtain the best treatment.

The essential oils extraction used steam distillation. This research applied the experimental method incorporating the extracted essential oils to the diet of 5 greenflies mortality at 12, 24, 48 and 84 hours since the diet start. With the obtained data the rescarch determined the efectivo treatments using statistical analysis ANOVA (analysis of variance) and tukey's test to 5%.

The best treatments showed these results: Tagetes minuta has the best punctuation at the first 12 hours with a 1% concentration of 0,2% and mortality average of 1,97 and 1,91%. The less potent treatment was Tagetes terniflora with a concentration of 0,2% and mortality average of 1,21 andl,39. The rescarch found the three marigold species have insecticide activity for killing adults cabbage greenflics.