Aq. solns. of the some alkaloids and terpenoids (concns. 0.2%, 0.7% and 1.2%) were used to protect rape leafs against the Anion vulgaris Moquin Tandon slugs. The highest effectiveness in reducing the damage for all concns. was achieved for sparteine and thymol. Mortality of slugs after 48 hrs. of ingestion of the treated leaves with 1.2% thymol soln. was 66.7% whereas the treatment with sparteine solns. (0.7 and 1.2%) resulted in 66.7% and 83.3% of mortality, resp.