Pest Management Science (2008) 64, 736-747

Daniel Casado, César Gemeno, Jesús Avilla and Magí Riba (2008)
Diurnal variation of walnut tree volatiles and electrophysiological responses in Cydia pomonella (Lepidoptera: Tortricidae)
Pest Management Science 64 (7), 736-747
Abstract: BACKGROUND: In recent years, many studies have been carried out on the behavioural and electrophysiological responses of Cydia pomonella (L.) to host volatile emissions, to find alternative attractants to the sex pheromone for pest monitoring. These studies have focused on apple and pear, and very little has been done on walnut. In the present work, the diurnal and seasonal variation in walnut volatile emissions and the electrophysiological response of C. pomonella have been studied.
RESULTS: Ninety compounds were detected in walnut emissions, mainly monoterpenes and sesquiterpenes. The most abundant compound was ß-pinene, which, together with (Z)-3-hexenyl acetate, (E)-ß-ocimene, limonene, germacrene D, 1,8-cineole, sabinene, (E)-ß-farnesene, (E)-ß-caryophyllene, ß-myrcene and ß-phellandrene, constituted between 81.9 and 90.5% of the total chromatographic area. Differences between seasonal periods were significant for 39 compounds, and between daytimes for 14 compounds. Discernible and consistent EAD responses were detected to 11 walnut-origin compounds, and confirmed with synthetics to seven of them. Except for alloocimene, pinocarvone and caryophyllene oxide, all these compounds are also emitted by apple.
CONCLUSION: Walnut volatile emissions differ widely from apple ones, but both share many compounds that are EAD-active in C. pomonella. However, among EAD-active compounds there are three walnut-specific ones, which should be further tested in behavioural assays.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Jesús Avilla

Research topic(s) for pests/diseases/weeds:
pheromones/attractants/traps

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Cydia pomonella	Walnut/butternut (Juglans)