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The effects of beta acids from hops (Humulus lupulus) on mortality of Varroa destructor (Acari: Varroidae)

Author:
DeGrandi-Hoffman, Gloria, Ahumada, Fabiana, Probasco, Gene, Schantz, Lloyd
Source:
Experimental & applied acarology 2012 v.58 pp. 407
ISSN:
0168-8162
Subject:
Acarapis woodi, Apis mellifera, Humulus lupulus, Varroa destructor, acaricides, beta acids, hops, mortality, parasitic mites, topical application
Abstract:
Hop (Humulus lupulus L.) beta acids (HBA) were tested for miticidal effects on varroa destructor Anderson and Trueman, a parasitic mite of the honey bee (Apis mellifera L.). When varroa were placed on bees that had topical applications of 1 % HBA, there was 100 % mite mortality. Bee mortality was unaffected. Cardboard strips saturated with HBA and placed in colonies resulted in mite drop that was significantly greater than in untreated hives. HBA was detected on about 60 % of the bees in colonies during the first 48 h after application. Mite drop in colonies lasted for about 7 days with the highest drop occurring in the first 2–3 days after treatment. There was a reduction in the percentages of bees with HBA and in the amounts on their bodies after 7 days. Bee and queen mortality in the colonies were not affected by HBA treatments. When cardboard strips saturated with HBA were put in packages of bees, more than 90 % of the mites were killed without an increase in bee mortality. HBA might have potential to control varroa when establishing colonies from packages or during broodless periods.
Agid:
57406
Handle:
10113/57406