Uso de manipueira de Mandioca (manihof esculentu ciuntz) e extrato de Erva-de-Rato L .i erva-de-rato (Palicowea marcgravii st. Blnl) sobre o pulgão preto dos Do citros (toxopfera citricida kirkaldy) em condições experimentais

Abstract

Studies have bem registered the use of toxicant plants extracts as alternative for the control of plagues among them stands out the erva-de-rato (Palicourea marcgravii) and the by- product 6om the residue of the cassava, the manipueira (Manihot esculenta) cornmon plants in

region of amazon, which has as active principie the monofluoracetic acids and the cyanide acid, both break the krebs cycle hanning the cell breathing. This research had as main target, to investigate íhe insecticide potential of the Manihut esculenfa (manipueira of cassava) and Palicourea marcgravii (erva-de-rato) on Toxoptera citricida (brown citms aphid), in experimental condítions. That greenfly attacks the citros, wrinking the yomg leaves and the sprouts death, as well as transmitting the sadness vinis of the citros. In laboratory, we have obtained the extracts of these two plants, in five concentrations (lOmg/ml, 20mg/ml, 30mg/ml, 40mg/ml and 50mglml). Each extract tests were accomplished simulating the ways of action through contact and translamínar. The outlíne was entirely fortuitous through 11 treatrnents (including the witness) and 5 repetitions. A11 the analyzed concentrations (10 to 50 mg/ml) causes mortality above 50%, in T. cirrícida. The concentration 50 mglml caused the mortaiity of aU the insecl (n = 100%) in both rehearsals in the two application processes, contact and translaminar. As per above mentioned tests, the use of both vegetables, manipueira extracts (M. esculenta) and erva-de-rato (P. mmcgravii) might be an insecticide alternative, for the control of the brown citros aphid.