Components of male aggregation pheromone of strawberry blossom weevil, Anthonomus rubi Herbst. (Coleoptera : Curculionidae)

Citation
Pj. Innocenzi et al., Components of male aggregation pheromone of strawberry blossom weevil, Anthonomus rubi Herbst. (Coleoptera : Curculionidae), J CHEM ECOL, 27(6), 2001, pp. 1203-1218
Citations number
41
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF CHEMICAL ECOLOGY
ISSN journal
0098-0331 → ACNP
Volume
27
Issue
6
Year of publication
2001
Pages
1203 - 1218
Database
ISI
SICI code
0098-0331(200106)27:6<1203:COMAPO>2.0.ZU;2-E
Abstract
The strawberry blossom weevil, Anthonomus rubi, is a major pest of strawber ries in the United Kingdom and continental Europe. As part of a project to develop noninsecticidal control methods, the pheromone system of this speci es was investigated. Comparison of volatiles produced by field-collected, o verwintering individuals of each sex led to identification of three male-sp ecific compounds-(Z)-2-(3,3-dimethylcyclohexylidene)ethanol, (cis)1-methyl- 2-(1-methylethenyl)cyclobutaneethanol, and 2-(1-methylethenyl)5-methyl-4-he xen-1-ol (lavandulol)-in amounts of 6.1, 1.2, and 0.82 mug/day/male. The fi rst two compounds are components of the aggregation pheromone of the boll w eevil, Anthonomus grandis, grandlure II and grandlure I, respectively. Gran dlure I was the (IR,2S)-(+) enantiomer and lavandulol was a single enantiom er, although the absolute configuration was not determined. Trace amounts o f the other two grandlure components (Z)-(3,3-dimethylcyclohoxylidene)aceta ldehyde (grandlure III) and (E)-(3,3-dimethylcyclohexylidene)acetaldehyde ( grandlure IV) were also detected. (EE)-1-(1-Methylethyl)-4-methylene-8-meth yl-2,7-cyclo-decadiene (germacrene-D), a known volatile from strawberry pla nts, Fragaria ananassa, was collected in increased amounts in the presence of pheromone-producing weevils. Male weevils only produced pheromone on F. ananassa and not on scented mayweed, Matracaria recutita, or cow parsley, A nthriscus sylvestris, although these are known food sources. In field trial s using various combinations of synthetic grandlures I, II, III, and IV and lavandulol, significantly more weevils were caught in traps baited with bl ends containing grandlure I and Il and lavandulol than in those baited with blends without lavandulol or unbaited controls. Addition of grandlure III and IV had no significant effect on attractiveness. Horizontal sticky traps were found to be more effective than vertical sticky traps or standard bol l weevil traps. In mid-season females predominated in the catches, but late r more males than females were trapped.