Abstract
In an effort to find new ways to control varroatosis, malathion was mixed with dry pollen substitute in a concentration of 50 ppm. The preparation was put in a sickle-like arrangement in empty cells in the central area of the combs. These combs were put into 15 bee colonies during the period from November 1985 to March 1986. This kind of treatment was quite satisfactory to control Varroa mite without disturbance of bee colonies during the late season when the winter cluster was formed. The position of contaminated comb (s) within the cluster was an important factor for the effectiveness of the acaricide. About 50 °/ of the dead mites were found on the bottom of the hive during the first day and 80 °/ during the first three days after the application of the preparation. The toxicity of malathion was masked but not lost 10 days after the introduction of contaminated comb in the bee colony.
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