Effect of saponin extracted from Passiflora alata Dryander (Passifloraceae) on development of the Spodopterafrugiperda (J.E. Smith) (Lepidoptera, Noctuidae).
The saponins are glycosides with wide distribution among plants which may be toxic for herbivorous arthropods. Their insecticidal activity may be associated to the ability of producing alterations in the feeding behavior, in the molting process and causing death. This study evaluated the lethal and sub lethal effects of a saponins extract, obtained from Passifloraalata on Spodopterafrugiperda, by ingestion tests with artificial diet. Nine solutions with increasing extract concentration and a control solution with sterile distilled water were used in the test. In total 1500 insects were used in 5 repetitions, 30 replicates per concentration. Considering the total mortality, all treatments differed statistically from the control one, but not among them. Most of the observed effects were sub lethal, in which 68.3% insects presented deformation. The number of deformed insects per treatment increased as the extract of saponins concentration increased. In conclusion the mortality revealed significant difference between control and other treatments, which indicated the potential of saponins present in P. alata as a control agent of S. frugiperda. This potential needs to be better evaluated, especially if the facilities of raising and large scale production of the plant are considered.