Damages from San Jose Scale (Quadraspidiotus perniciosus Comst.) on apple in different growing systems

Vilina Petrova

Abstract: The investigations were carried out in an experimental apple orchard of the Institute of Agriculture at Kyustendil, Bulgaria in four consecutive years (2009-2012). The purpose of the study was to establish density of wintering stock and damages from San Jose Scale (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 Q. 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.

Keywords: apple; damages; growing systems; Quadraspidiotus perniciosus; San José Scale

Date published: 2017-06-21