Abstract
AbstractCeutorhynchus inaffectatus Gyllenhal (Coleoptera: Curculionidae: Ceutorhynchinae) is a monophagous species feeding only on Hesperis matronalis L. (Cruciferae) in North‐western Europe. Feeding responses of this weevil to five glucosinolates from its host plant were compared with the responses to four glucosinolates from non‐host plants. The major glucosinolates in the host plant were isolated and identified: 6‐methylsulphinylhexylglucosinolate (glucohesperalin), 3, 4‐dihydroxybenzylglucosinolate (glucomatronalin), 3‐O‐apiosylglucomatronalin, a 3, 4‐dihydroxybenzoylester and a 3, 4‐dimethoxybenzoylester of 3‐O‐apiosylglucomatronalin. The three glucosinolates containing apiose were powerful feeding stimulants for C. inaffectatus while the other host plant compounds and allylglucosinolate (sinigrin), 3‐methylsulphinylpropylglucosinolate (glucoiberin), benzylglucosinolate (glucotropaeolin) and p‐hydroxybenzylglucosinolate (sinalbin) were weaker stimulants. The role of glucosinolates in host plant selection of C. inaffectatus and related monophagous crucifer feeders is discussed.
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