ManythingshasbeentestedinthefightaginstVarroadestructor.Organicacidshaveshownreasonablygoodresultsandandhavebeenusedformorethan10yearsinEurope.ThefirstacidusedwasFormicacidthatwasevaporatedataslowspeedinsidethehive.Itisstillinusewhenit'stheonlyacidthatpenetratesthewaxandkillmitesinsidethecappedcells.Itdoeshavesomedrawbackswhenitdependsonseveralfactorsliketemperature,hivevolumeandhivetype,andhastobemonitoredcarefullyforefficiancy.
LatelyOxalicacidhasproventobeuseful,researchisgoingoninanumberofcountriesinEuropeandiscoordinatedtocompareresultsfromdifferentregions.
Tricklingasolutionofwater-sugar-oxalicacidisapromisingmethodtokeepVarroalevelsdown.
Ithastobedonelateintheseasonwhenthereisnobroodinthehive.
Alargesyringemakesiteasytocontrolthevolumegiventoeachhive.
Itismuchfaster,safer,andcheaperthanusingavaporiser.
UseonlyOxalic-2-hydrate(C2H2O2*2H2O),notthewaterfreeOxalic.
Mix7,5partsOxalicto100partswaterand100partssugarbyweight
75gOxalic-1literwater-1kgsugarwillmake1,66litersolutionthatisenoughfor50hives.Thismixedupsolutionwillkeepforafewweeksonlyandshouldbeusedatonce.
Use20to35mlsolutionforeachhivedependingonthesizeofthetreatedcolony.
Ona2boxhivethesolutionisdistributedaccordingtotheamountofbeesineachbox.Thetopboxnormallyholdsmorebeesandisgiven70%ofthesolution.
Thebottomboxisgiven30%ofthetotalsolution.
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Thesolutionisdistributedevenlyinthegapbetweenthetopbars,soitwilldripdownandreachasmanybeesaspossible.
Timeperhive1,5min.Costperhive0,1€.