Biological Activity of Crescentia alata (Lamiales: Bignoniaceae) Fractions on Larvae of Spodoptera frugiperda (Lepidoptera: Noctuidae)
Keywords:
iridoids, bioinsecticidal activity, mortality of larvae, antifeedantAbstract
The need for new bioinsecticidal compounds motivates the study of natural products. Therefore, we studied the activity of Crescentia alata Kuth (Lamiales: Bignoniaceae) against Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae). We showed that C. alata has bioinsectidal activity. After 7 days of exposure to C. alata fractions in the diet at 200 ppm, fractions 3, 4 and 7 caused 90.7% weight loss in the larvae, and at 100 ppm, fractions 2, 4, 7 and 8 caused 90.1% weight loss with respect to the control. After 14 days of exposure to fractions 4 and 7 at 200, 100, and 50 ppm, the larvae had lost 94% of their weight compared to the control. There were large differences in larval mortalities between treatments, and fractions 5 and 6 at 200, 100, and 50 ppm induced the highest mortalities, which ranged from 65 to 80%. Possibly the iridoids identified from the C. alata fruit fractions are responsible for the antifeedant activity and mortality of S. frugiperda. This is the first report of C. alata fractions being evaluated as biocides of S. frugiperda.
La búsqueda de nuevos compuestos bioinsecticidas motiva el estudio de los productos naturales. Crescentia alata fue estudiada en contra de Spodoptera frugiperda. En este estudio se muestra la actividad bioinsectida de C. alata. Después de siete días de exposición de las fracciones en la dieta a 200 ppm las fracciones: 3, 4 y 7; indujeron un 90.76 % de reducción del peso, a 100 ppm las fracciones 2, 4, 7 y 8 redujeron el peso larval en un 90.1 % con respecto al testigo. Después de 14 días de exposición las fracciones 4 y 7 indujeron una reducción del peso larval en un 94 % con respecto del testigo. En la mortalidad larval existió una gran diferencia entre los tratamientos, la fracción 5 y 6 a 200, 100 y 50 ppm produjeron una alta mortalidad (65 a 80 %). Los iridoides identificados en las fracciones activas de C. alata, sean posiblemente los responsables de la actividad antialimentaria y mortalidad en S. frugiperda.
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