EFECTOS TOXICOLOGICOS DE CUATRO PLANTAS SOBRE EL GORGOJO DEL MAIZ SITOPHILUS ZEAMAIS MOTSCHULSKY 1855 (COLEOPTERA: CURCULIONIDAE) Y SOBRE EL GORGOJO DE LAS GALLETAS STEGOBIUM PANICEUM (LINNAEUS 1761) (COLEOPTERA: ANOBIIDAE) EN PERU

the biocide effect of four plants: coriander (coriandrum sativum l. [apiaceae]), sping holdback (caesalpinia spinosa (mol.) kuntze [fabaceae]), hairy beggarticks (bidens pilosa l. [asteraceae]) and elderberry (sambucus peruviana hbk [caprifoliaceae]), on adults of sitophilus zeamais motschulsky 1855 (curculionidae) and stegobium paniceum (linnaeus 1761) (anobiidae) in mortality bioassays at laboratory conditions were evaluated. at the highest concentrations of watery extracts (20 % w/v) used to c. sativum, c. spinosa, b. pilosa and s. peruviana did not show significant effects in comparison to control on both species of weevils. only dry dusts of c. sativum showed 25 % of mortality of s. zeamais and however c. spinosa produced 15 % of mortality of s. paniceum at the higher concentrations assayed (1.6 g ·10 g of corn-1). in addition, when c. spinosa, was evaluated in infusion watery (20 % w/v) on s. zeamais, 17.5 % of mortality was found. however, none of the plants in all formulations employed had more than 40 % mortality on two species of weevils in comparison to control. the possibilities of integration of biocide plants in control of agricultural stored product pests are analyzed