| Popis: |
In the region of Rijeka most of 450 registered beekeepers, with over 12.500 colonies are regularly using rotenone in stripes for the last seven years. To avoid the effect of the re-infestation with mites from neighbouring apiaries, additional treatments were done with KAS-81 and icing sugar. In 2008 experiments, rotenone in stripes was placed in the middle of the brood and was left there, 30 days. All together 111 colonies were used on two locations. In Rijeka, the initial infestation level of 2, 93%, already next day fell to 0, 48%, and with small weekly oscilations, after 30 days, to 0, 24%. In Pazin the infestation level fell from initial 1, 18% to 0, 24% next day, and after 30 days to 0, 06%. Control colonies were treated with Checkmite+, containing Coumaphos as the active ingredient. KAS – 81, is an alternative (Russian) preparative for varroa treatment. It is made from pine buds (Pinus sp.) and wormwood (Artemisia absinthium L.) KAS-81 experiments were conducted on 40 colonies on two different locations in Istria and Rijeka. No significant difference was detected in development of varroa population in colonies which received the KAS-81 treatment, and test colonies (which got a pure sugar syrup). Icing Sugar treatment was conducted on 40 colonies (20 on each location). Colonies were simply dusted between the combs (tea cup of icing sugar per 1 storey hive). In Rijeka, the initial infestation level of 3, 89% on 15th of August 2008, was raised to 4, 59% till 11th of September, while in Pazin on the same number of hives it fell from initial 1, 42% to 1, 18%. On both locations, already a single dusting treatment with icing sugar, allowed keeping varroa infestation level under the control prior the late summer rotenone in stripes treatment. |
