To Treat or Not to Treat Bees? Handy VarLoad: A Predictive Model for Varroa destructor Load

Author:

Dechatre Hélène,Michel Lucie,Soubeyrand Samuel,Maisonnasse Alban,Moreau Pierre,Poquet Yannick,Pioz Maryline,Vidau Cyril,Basso Benjamin,Mondet FannyORCID,Kretzschmar André

Abstract

The parasitic Varroa destructor is considered a major pathogenic threat to honey bees and to beekeeping. Without regular treatment against this mite, honey bee colonies can collapse within a 2–3-year period in temperate climates. Beyond this dramatic scenario, Varroa induces reductions in colony performance, which can have significant economic impacts for beekeepers. Unfortunately, until now, it has not been possible to predict the summer Varroa population size from its initial load in early spring. Here, we present models that use the Varroa load observed in the spring to predict the Varroa load one or three months later by using easily and quickly measurable data: phoretic Varroa load and capped brood cell numbers. Built on 1030 commercial colonies located in three regions in the south of France and sampled over a three-year period, these predictive models are tools designed to help professional beekeepers’ decision making regarding treatments against Varroa. Using these models, beekeepers will either be able to evaluate the risks and benefits of treating against Varroa or to anticipate the reduction in colony performance due to the mite during the beekeeping season.

Funder

Ministère de l’Agriculture, de l’Agroalimentaire et de la Forêt

Publisher

MDPI AG

Subject

Infectious Diseases,Microbiology (medical),General Immunology and Microbiology,Molecular Biology,Immunology and Allergy

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