The use of extracts of plants, usually under exploited in Amazonia, is an alternative to control phytophagous insects due to their low costs, easy preparation, use and environmental safety. The aim of this work was to evaluate the insecticidal action of P. aduncum on Aetalion sp. Adult insects collected on the Clitoria fairchildiana were separated in groups of ten individuals into plastic vessels and exposed to topic application of aqueous extracts of leaves and roots of P. aduncum. The extracts were applied at the concentrations of 10, 20 and 30 mg.ml-1. The control groups treated with distilled water. The tests lasted 48 h and every 12 h the mortality rate was evaluated. The experiments were performed in a complete randomized design with three treatments in five replicates more a attest group. The extract of leaves of P. aduncum showed shorter toxicity (CL50 = 20,9 mg.ml-1) than the extract of roots (CL50 = 20,2 mg.ml-1), but not statistically different. As much the watery extract of roots as of leaves of P. aduncum show insecticidal activity on adults of Aetalion sp. However, for not causing ambient impact during the collection, sends regards the leaves extract in programs of alternative control of this insect.
Insecticidal action; toxic plants; pest control; Aetalion; treehopper
