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Field and laboratory screening for fluvalinate‑tolerant Varroa populations in Portugal

Ano
2007
Abstract

Following widespread claims of rapidly decreasing Apistan field efficacy, a large‑scale screening project was put into practice towards trying to identify Portuguese Varroa populations highly tolerant to fluvalinate. Approximately 12 thousand field‑tests were carried out, for the most part based upon the “British National Bee Unit” field‑testing methodology (with an extra blank control test added). From all studied colonies, 1536 allowed for conclusive field‑testing (i.e. 3 or more Varroa were submitted to fluvalinate in a given test and no abnormal Varroa mortality was found in the respective control test). Using a 60 % fluvalinate‑induced Varroa mortality border line, 878 of those colonies were considered to host fluvalinate‑tolerant Varroa populations. On average, 18 mites were studied per colony that tested positive for fluvalinate‑tolerant Varroa populations. The overall fluvalinate therapeutic efficacy, as regards Varroa populations hosted in those colonies, was only 26.4 +‑ 0.6 % (mean +‑ s.e.m.). Capped brood samples from honey bee colonies that had field‑tested positive for fluvalinate‑tolerant Varroa populations were later collected to provide Varroa for laboratory reassessment of fluvalinate‑tolerance (basically, following Milani’s methodology). Even though we had to discard results obtained from approximately half of the collected brood samples (adding to a total of 172 samples, as a result of the insufficient numbers of mature Varroa they hosted), in many instances field‑test outcomes could be later confirmed by laboratory tests

Palavras Chave

Fluvalinato; Tolerância; Testes de campo; Varroa; Abelhas

Keywords

Fluvalinate; Tolerance; Field‑tests; Varroa; Honey bees

Tipo de Apresentação
Poster
Tipo de Revisão
Internacional
Âmbito Geográfico
Internacional
Situação
Publicado
Área de Trabalho
Referência

Pires, S; Maia, M; Murilhas, A; Pereira, O (2007). Field and laboratory screening for fluvalinate‑tolerant Varroa populations in Portugal. 40th International Apicultural Congress. Apimondia. Apimondia. Melbourne (Australia): 148-148