hvor kan man finde denne fil.
Vaskemetoden med sæbe er den metode som vi i Danmarks Biavlerforening benytter i forbindelse
med vores forsøgsarbejde, hvor resultaterne af midetællingerne skal være mere nøjagtige end hvad der kan opnås ved nedfaldsprøverne.
Der indsamles en biprøve, som beskrevet på side 14. Prøven kommes i fryseren for at sikre, at bierne dør
hurtigt. Når prøven skal undersøges, tilsættes en sæbeblanding (60 ml opvaskemiddel til 1 l vand).
Blandingen svinges rundt i et par minutter. Undgå om at ryste prøven voldsomt. Man skal bare svinge
den rundt, så miderne falder af bierne og synker til bunds. Ryster man op og ned, blander man blot prø-
ven mere og der dannes skum. I Danmarks Biavlerforenings laboratorium anvender vi et rystebord til
at løse denne opgave.
Herefter hældes blandingen op i en dobbeltsi (som man kender fra sining af honning). Med et brusehoved overbruses bierne, hvorved varroamiderne glider gennem grovsien og herefter kan de tælles i
finsien. Det gælder om at justere vandtrykket, så det ikke er for voldsomt. Er vandtrykket for kraftigt, risikerer man at ødelægge bierne og presse deres brod og ben igennem grovsien. Det er vigtigt at man bruser fra forskellige retninger og evt. rører rundt i prøven med hånden for at sikre, at alle mider bruses af.
Man kan vælge at måle en mængde bier, f.eks. 100 ml, som giver ca. 300 bier. Det er en forholdsvis
unøjagtig metode, men den kan dog godt anvendes i praksis. Man opnår et mere præcist resultat ved
at veje prøven. En bi vejer i gennemsnit ca. 0,125 g, hvilket svarer til 8 bier per gram. Herudfra kan man
beregne antallet af bier. Det mest præcise er at tælle antallet af bier i prøven. Ud fra antal mider og antal bier kan man beregne antallet af mider per 100 bier.
Du gennemser i øjeblikket blogarkiverne på Varroa.dk for august 2023.
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