Aggregation pheromone of square-necked grain beetle,Cathartus quadricollis (Guér.) |
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Authors: | H. D. Pierce Jr. A. M. Pierce B. D. Johnston A. C. Oehlschlager J. H. Borden |
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Affiliation: | (1) Department of Chemistry, Simon Fraser University, V5A 1S6 Burnaby, British Columbia, Canada;(2) Centre for Pest Management Department of Biological Sciences, Simon Fraser University, V5A 1S6 Burnaby, British Columbia, Canada |
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Abstract: | When feeding on rolled oats, male square-necked grain beetles,Cathartus quadricollis (Guér.), produced the aggregation pheromone (3R,6E)-7-methyl-6-nonen-3-yl acetate, for which the trival name quadrilure is proposed. The pheromone was highly attractive to both sexes in a two-choice, pitfall olfactometer modified to retain responding beetles by placing a food stimulus (an oat flake) in the glass vials containing the experimental and control stimuli. TheS enantiomer of the pheromone was inactive. Males also produced small amounts of (E)-7-methyl-6-nonen-3-one, (E)-7-methyl-6-nonen-3-ol, and (6E)-7-methyl-3-propyl-2,6-nonadienyl acetate, but these compounds were inactive in the laboratory bioassay. Segregated males and females both produced (R)-(–)-1-octen-3-ol, which by itself was repellent to both sexes but did not diminish beetle response to the aggregation pheromone.Coleoptera: Cucujidae.Research supported by the Natural Sciences and Engineering Research Council of Canada, Strategic Grant G1039 and Operating Grants A3881 and A3706. |
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Keywords: | Cathartus quadricollis (Gué r.) square-necked grain beetle Coleoptera Cucujidae aggregation pheromone (3R,6E)-7-methyl-6-nonen-3-yl acetate (E)-7-methyl-6-nonen-3-one (E)-7-methyl-6-nonen-3-ol (6E)-7-methyl-3-propyl-2,6-nonadienyl acetate 1-octen-3-ol repellent |
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