Infestation of Honeybee (Apis Mellifera) Colonies by the Parasitic MitesVarroa JacobsoniandTropilaelaps Clareaein South Vietnam and Results of Chemical Treatment

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Abstract
In honeybee (Apis mellifera) colonies examined in South Vietnam an average of 4·9% of brood cells were infested by Varroa jacobsoni and 46·2% by Tropilaelaps clareae. Average rates of infestation of adult workers were 6·3 per 100 for V. jacobsoni and 3·4 per 100 for T. clareae. Thus, despite a tenfold higher infestation of brood by T. clareae, infestation of adults by V. jacobsoni was twice as high. Amitraz was more effective than phenotiazine against both mite species, killing 95·7% of V. jacobsoni and 79·2% of T. clareae mites whereas phenotiazine killed only 57·7% of V. jacobsoni mites and 56·4% of T. clareae. Because of the low incidence of V. jacobsoni, mite treatment in Vietnam should be concentrated on T. clareae which can be controlled without medication.