A preliminary study of the clover mite (Bryobia praetiosa Koch) on walnut trunk trees in Sardoieh, Jiroft
Subject Areas :
Keywords: Bryobia praetiosa, Walnut trunk trees, Sardoieh, Jiroft,
Abstract :
Subsequent to surveying of egg mass of white clover mite (Bryobia praetiosa) in red patches on young walnut tree trunks within Bafeteh Jebal Barez in Sardoieh region of Jiroft vicinity and wide infestation in other localities in similar adjusting localities, an investigation was carried out for two years (1996-1997) in the region. Mite specimens were collected for determination of dominant species. Merely female individuals of clover mite (Bryobia praetiosa) were identified in the entire surveyed areas. Biological activity of clover mite was explored through regular sampling at weekly intervals on young and old walnut trees, fruitful, fruitless and weed plants in the infested area of Sardoieh, Dehbakeri and Ramon region in Kerman province. Among the surveyed host plants, only soft trunks of young walnut trees was found as major place for egg laying. Abundance and population fluctuation of clover mite eggs on young bark of walnut trunks were recorded in 4 squares centimeters as sampling unite out of 10 marked walnut trees in five replications from end of May to late of November. Yielded data showed maximum active stages in May whilst decreasing egg laying in subsequent months and winter on soft young walnut trunk, 40 to 50 centimeters above the ground. The egg laying continued until November and the mite had a single generation per year. Maximum winter egg mass was recorded during September in Sardoieh region. Statistical analyses upon the quantity of eggs and adult mites in different temperatures and also relative humidity conditions in several sampling provided evidence that there is no significant correspondence between these environmental effects and the abundance of active stages and egg numbers of Bryobia praetiosa.
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