(Supplementary Data). reported previously Analysis of the results showed that the majority of the tested QASs exhibited good antifeedant activity toward adult granary weevils as well as khapra beetle larvae, and very good activity toward confused flour beetle larvae. A deviation from this rule was observed only in the case of 4Br, 4Asp and 4Ala containing a 2-hydroxyl substituent, for which the total deterrence coefficient T toward granary weevil showed values ranging from 81 to 99, comparable to the