The toxicity of 3 different extracts from Capparis spinosa seeds was tested against the lesser grain borer, Rhizopertha dominica, F. adults . The petroleum ether extract was applied to wheat grains at 7, 9, 10, 11, 13 and 14 ml/kg (as surface treatment) , chloroform extract was added at 13, 14, 15, 16 and 18 ml/kg , while acetone extract was used at 11, 12, 13, 14 and 15 ml/kg. Results indicated that all extracts at the high doses gave com­plete mortality (100%) after 7 days of exposure. LC95 level continued to give 90% kill up to 4 weeks for acetone extract, while continued up to 5 and 6 weeks for petroleum ether and chloroform extracts, repec­tively. The LC59 values of the three extracts caused high reduction in the number of F1 progeny, no offspring was produced with LC95 level. The percentage of germination of the treated wheat grains varie­ty Sakha 69 were highly affected by the three extracts of Capparis spi­nosa seeds .