Cross-attraction of Carpophilus humeralis to pheromone components of otherCarpophilus species

Citation
Bw. Zilkowski et Rj. Bartelt, Cross-attraction of Carpophilus humeralis to pheromone components of otherCarpophilus species, J CHEM ECOL, 25(8), 1999, pp. 1759-1770
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF CHEMICAL ECOLOGY
ISSN journal
0098-0331 → ACNP
Volume
25
Issue
8
Year of publication
1999
Pages
1759 - 1770
Database
ISI
SICI code
0098-0331(199908)25:8<1759:COCHTP>2.0.ZU;2-1
Abstract
The pineapple beetle, Carpophilus humeralis, is known from field tests to b e more attracted to baits containing the pheromone blends of other Carpophi lus species and food odors than to food odors alone, but a pheromone is not yet known for C. humeralis. Wind-tunnel bioassays were used to determine s pecifically which of the Carpophilus pheromone components were the most att ractive for C. humeralis. Nine tetraene and triene components normally used in field studies, plus eight additional male-specific compounds from other Carpophilus species, and one additional analog, were used in these experim ents. At the 10-ng level, 15 of 18 compounds tested with a food-related coa ttractant (propyl acetate) were more attractive for C. humeralis than the c oattractant alone. With decreasing doses (1, 0.1, and 0.01 ng) the number o f attractive compounds declined. Only one compound, (2E,4E,6E,8E)-3,5,7-tri methyl-2,4,6,8-decatetraene (1), had significant attraction for C. humerali s at 0.01 ng, close to the lower threshold level of pheromone attraction fo r other Carpophilus species. Responses to mixtures of compounds were explor ed. For example, 1 was synergistic with 4-ethyl-2-methoxyphenol (E), 2,5-di isopropylpyrazine (D), and 2-phenylethanol (P), which are known attractants for C. humeralis; a mixture of 1 plus E, D, and P was 20 times more attrac tive than 1 alone and five times more than E, D, plus P. The specificity of C. humeralis for certain tetraenes was similar to that exhibited by C, hem ipterus, while the specificity for trienes was similar to that of C. freema ni. The behavior of C. humeralis to these pheromone components suggests tha t it may have a pheromone like that of other Carpophilus species or that it could possibly use these compounds as host finding kairomones.