Feeding-deterrent activity of alpha-asarone isomers against some stored Coleoptera

All isomers of alpha-asarone [(E)-4-prop-1-enyl-1,2,5-trimethoxybenze] were tested for their feeding deterrent activity against adults of Sitophilus g ranarius and Tribolium confusum and larvae of Trogoderma granarium and Trib olium confusum. (E)-2-prop-1-enyl-1,3, 5-trimethoxybenzene exhibited the st rongest deterrent activity against all the species tested. The total coeffi cients of deterrency for this compound were 140.6 and 169.7 for Tribolium c onfusum adults and larvae, respectively, and 144.9 and 104.6 for larvae of Trogoderma granarium and adults of Sitophilus granarius, respectively. (C) 2000 Society of Chemical Industry.