Journal of Pest Science (2015) 88, 583-592

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Stefano Bedini, Guido Flamini, Jessica Girardi, Francesca Cosci and Barbara Conti (2015)
Not just for beer: evaluation of spent hops (Humulus lupulus L.) as a source of eco-friendly repellents for insect pests of stored foods
Journal of Pest Science 88 (3), 583-592
Abstract: Spent hops is a waste produced in large amount by the brewing industry. Rhyzopertha dominica and Sitophilus granarius are insects that cause important economic losses of stored foods. In this study, for the first time, spent hops has been evaluated as a source of essential oil (EO) and chemicals with repellent activity against R. dominica and S. granarius. Spent hops EO yield was 0.11 %. The terpenes myrcene, alpha-humulene, and ß-caryophyllene were its main components (47 %). Spent hops EO RD50 values were 0.01 and 0.19 μL cm-2 for R. dominica and S. granarius, respectively. Among the chemicals, myrcene was able to exert the highest repellency against R. dominica (RD50 = 0.27 µM cm-2), while limonene was the most effective compound against S. granarius (RD50 = 0.89 µM cm-2). These results indicate spent hops as an excellent source of EO and chemicals to be utilized as low-cost, eco-friendly insect pests repellents in the protection of stored food.
(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): Barbara Conti

Research topic(s) for pests/diseases/weeds:
control - general

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Sitophilus granarius
Rhyzopertha dominica