Petrova, V. 2017 Damages from San Jose Scale (Quadraspidiotus perniciosus Comst.) on apple in different growing systems. Bulgarian Journal of Crop Science 54(1): 53–59
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Notes: The purpose of the study was to establish density of wintering stock and damages from San Jose Scale, Comstockaspis perniciosa (= Quadraspidiotus perniciosus) in different apple growing systems. Three scab resistant cultivars ‘Prima’, ‘Florina’ and ‘Erwin Baur’ grafted on rootstocks MM106 were planted in 1996.Three apple growing technologies - conventional, integrated and biological (organic) were examinated. During the investigation it was found that C. perniciosus is a serious pest of apple in the technologies studied. The highest percentage of damaged fruit was observed in the integrated technology due to lack of effective insecticides approved.
