Optimum male Grapholitha molesta (Busck) attractancy to cis -8-dodecenyl acetate (c8–12:Ac) required 6–7% trans isomer, whereas male Grapholitha prunivora (Walsh) attractancy to c8–12:Ac was best when 2.2% of the trans isomer was present. Rubber septa containing 200 μg of the attractant mixture (6.6% trans) were the most attractive for G. molesta and this could be synergized with 600 μg of dodecyl alcohol. Dodecyl acetate inhibited attractancy of both Grapholitha species.
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Roelofs et al. (1974) studied this question.
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