Toxicity of oil from Anacardium humile Saint Hill (Anacardiaceae), on Bemisia tuberculata (Bondar, 1923) (Hemipttera: Aleyrodidae) on cassava plants

Abstract

The aim was to evaluate the toxic effects of essential oil of Anacardium humile, in different concentrations, on survival and development of the whitefly B. tuberculata. The experiment was carried out in a greenhouse at a temperature of 26±4º C. Twenty adults were confined in cages, which contained a leaf of mandioca plant and removed after 24 hours. The products tested were sprayed when the nymphs were attached to the leaves. Data was collected by counting nymphs, pupae and adults and by counting the passages of each daily stage. All treatments increased the juvenile phase of development and led to increased mortality in the nymphal stage, 79.81 (2%) 77.89 (0.8%) 79.98 (0.05%) and 67.14% (0,006%) and total mortality of pupae. It was concluded that the oil from the leaves of A. humile is a supplier of molecule(s) insecticide(s) from the essential oil and causes a deleterious effect on B. tuberculata resulting in an increase in the juvenile phase and nymph mortality and total mortality of pseudopupae.