CAPA statement on honey bee wintering losses in Canada (2021)

Citation

Claing G, Kempers M, Kennedy K, Kozak P, Lafrenière R, Maund C, Menzies C, Muirhead S, Nasr M, Ovinge L, Pernal S, Sproule J, van Westendorp P, Wilson G, Hoover S (2021) CAPA statement on honey bee wintering losses in Canada (2021).
https://capabees.com/shared/CAPA-Statement-on-Colony-Losses-2020-2021.pdf

Abstract

The Canadian Association of Professional Apiculturists (CAPA) and Provincial Apiarists
coordinated the annual honey bee wintering loss report for 2020-2021. As in previous years, the
survey consisted of harmonized questions based on the national beekeeping industry, with
Provincial Apiarists collecting survey data across all provinces. Respondents collectively operated
398,961 honey bee colonies across Canada, representing 52% of all colonies wintered during
2020-2021. The national winter loss, including non-viable bee colonies, was 23.2% with provincial
losses ranging from 12.2% to 32.2%. The overall national colony loss reported in 2021 is slightly
less than the average reported losses since 2007 (25.8%). Despite these reported annual losses,
through the hard work of beekeepers replacing dead and weak colonies and making increases,
Statistics Canada reports that the total national colony count has increased by 26.7% during the
period between 2007 and 2020.

Each province ranked the top four suspected causes of colony losses as reported by respondents.
These varied from province to province. The most frequently cited causes of colony losses were
poor queens, weak colonies in the fall and ineffective varroa control. When asked whether
COVID-19 related issues had an impact on winter mortality, respondents reported a low impact
(mean of 1.3 to 3 on a scale of 1 to 10). For beekeepers who reported a higher impact of COVID
on winter mortality (score of 6 and more), the most frequent issues were access to labour, access
to bees and access to supplies.

Beekeepers also responded to questions on the management of three serious parasites and
pathogens to beekeeping: Varroa destructor, Nosema spp. and American Foulbrood:
Paenibacillus larvae. The majority of beekeepers in most provinces reported that they monitored
for varroa mites. The most commonly reported varroa treatments were: Apivar® or formic acid
treatments in the spring; Apivar® or formic acid in the summer or fall; and oxalic acid in late fall.
Many Canadian beekeepers treated their colonies to mange the risk of nosemosis and American
foulbrood. Across the country, registered antibiotics were the commonly used treatments;
nevertheless, methods and timing of application varied from province to province.

Provincial Apiarists, technology-transfer personnel, and researchers have been working with
beekeepers across Canada to encourage them to monitor for honey bee pests, especially varroa
mites, brood diseases, and nosema, and adopt recommended integrated pest management
practices to keep these pests under control. CAPA members continue to work through working
groups encompassing diverse stakeholders to educate and to develop and improve management
options for beekeepers to keep healthy bees and manage winter loss in Canada.

Publication date

2021-07-27

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