Effect of a lactic acid treatment during winter in temperate climate upon Varroa jacobsoni Oud. and the bee (Apis mellifera L.) colony |
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| Authors: | Bernhard Kraus Stefan Berg |
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| Institution: | (1) Landesanstalt für Bienenzucht, Im Bannen 38-54, 56707 Mayen, FRG;(2) Present address: Vakgroep Vergelijkende Fysiologie, Projectgroep Ethologie en Socio-oecologie, Centrumgebouw Noord, Universiteit Utrecht, Padualaan 14, De Uithof, Postbus 80086, 3508 TB Utrecht, The Netherlands |
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| Abstract: | Three groups of bee colonies were treated with lactic acid, the pesticide Perizin or lactic acid and Perizin in order to validate the applicability of lactic acid in Varroa mite control. The lactic acid treatment was conducted during winter. Eight ml of lactic acid (15%) per comb side were applied with a dosage gun. The treatment was highly efficient and 94.2%–99.8% of the mites in a colony were killed. Due to precise dosage the lactic acid treatment caused less bee mortality than a treatment with the pesticide Perizin. A lactic acid treatment at-0.2°C caused bee mortality comparable to a Perizin treatment. The number of queen losses after lactic acid treatment and after Perizin treatment was comparable. The number of bees, the size of the brood area, the amount of stored honey and Nosema infestation rates were not significantly different in lactic acid treated colonies and Perizin treated colonies in spring after treatment. |
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| Keywords: | Varroa jacobsoni Apis mellifera lactic acid treatment efficacy bee mortality |
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