| Popis: |
Rotenone (C23H22O6) is a slow-acting poison which interferes with the electron-transport system in the mitochondria, acting as a general inhibitor of cellular respiration, and therefore suspective species (like varroa) have a poor chance to develop rezistence on it. It is rapidly broken down in soil and in water and is ultimately converted to carbon dioxide and water. Last years rotenone in stripes was used as a routine varroa treatment in Slovenia and Croatia, where has proven to be very efficient. The efficiency of rotenone in stripes was checked according to the method for determining the number of varroa in colonies, (described in ADIZ, 7/2006, by Büchler and others). For this purpose, two sets of bee samples were collected: first recently before the treatment, and second 4 weeks after the treatment. Control was done by Checkmite+ (coumaphos). All together185 bee colonies located on 5 different apiaries in the surroundings of Rijeka were involved in the experimental treatment. Within the group of 162 colonies covering one LR supper, the average initial invasion level of 17, 09%, dropped after the treatment, on 0, 55% (with CheckMite+ on 0, 13%). In parallel experiment, done on 23 colonies covering two LR suppers (placed on one apiary, and treated with double doses of medicaments), the initial invasion of 25, 01%, after the treatment, dropped to still high 7, 35% (with CheckMite+ on 0, 32%). However, all colonies survived the winter with just one additional treatment with oxalic acid in December, which gives indication that varroa was alive, but enabled. According to the practical experience, as well as to the results of this work, rotenone in stripes might be considered as a good alternative drug for varroa treatment. |
