Hygienic removal of freeze-killed brood does not predict Varroa-resistance traits in unselected stocks.

Gil Leclercq*, Tjeerd Blacquière, Nicolas Gengler, Frédéric Francis

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)

Abstract

In honey bees (Apis mellifera L.), hygienic behavior of workers against Varroa destructor provides the colonies with some resistance to this parasite. The removal of freeze-killed brood (FKB) has often been used as a proxy to assess the removal of Varroa-infested brood. The question is whether this approximation is reliable enough to estimate the benefits induced by the removal of Varroa-infested brood in unselected stocks. For this purpose, we investigated the relation between the removal of FKB and three other variables: (1) the percentage of pupae and workers infested by V. destructor; (2) the share of mites in brood compared to phoretic mites; and (3) the reproductive success of mites. To be a reliable estimate, the removal of FKB should correlate with these three variables. Since hygienic behavior is naturally expressed and highly variable in unselected stocks, we chose to use such stocks to get a wide range of FKB removal. There was no correlation between FKB and the three other variables. We conclude that removal of FKB is not a good estimate for hygienic behavior towards Varroa mites in unselected stocks.
Original languageEnglish
Pages (from-to)292-299
JournalJournal of Apicultural Research
Volume57
Issue number2
Early online date11 Feb 2018
DOIs
Publication statusPublished - Mar 2018

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