Abstract
The currant clearwing Synanthedon tipuliformis (Clerck) (Sesiidae) is a worldwide pest of black currants, Ribes nigrum. This moth has been observed to feed on nectar of inflorescences of Canada thistles, Cirsium arvense (L.) Scop. This work was undertaken to identify floral compound(s) produced by Canada thistles inflorescences that mediate the response of the currant clearwing. Floral volatiles were collected during the day and analysed by coupled gas chromatography/electroantennographic detection (GC/EAD) and gas chromatography/mass spectrometry (GC/MS). Three compounds consistently elicited EAD response from moth antennae and were identified by GC/MS as phenylacetaldehyde, methyl salicylate and dimethyl salicylate. When the compounds were tested individually or in various combinations in field trapping experiments, a 3-component blend attracted the largest number of female and male currant clearwings. Subsequent field trapping experiments were conducted to determine the optimal attraction dose for the ternary blend using three loadings of 1, 10 and 100 mg loaded into a polyethylene sachet. The highest catches were in traps baited with the 100 mg loading. In all trials, males and mated females were caught in significant numbers, while very low numbers of virgin females were found in the traps. In recent years the efficacy of mating disruption against currant clearwing has been reported as declining. The new kairomone blend identified in this study can be used with the sex pheromone to provide an effective control option for this important pest.
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This work was supported by the New Zealand Institute for Plant and Food Research Limited with core funds from the Ministry of Business Innovation and Employment. Photo of volatile collection setup (Fig. 1) by Lee-Anne Manning.
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El-Sayed, A.M., Revell, J., Jiménez-Perez, A. et al. Identification of a floral-derived kairomone for currant clearwing, Synanthedon tipuliformis . Chemoecology 26, 187–193 (2016). https://doi.org/10.1007/s00049-016-0218-9
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DOI: https://doi.org/10.1007/s00049-016-0218-9