A STEPWISE ASSESSMENT OF DAKTULOSPHAIRA VITIFOLIAE INFESTED GRAPEVINES IN A VIENNESE VINEYARD SITE
Daktulosphaira vitifoliae Fitch, the grape phylloxera, was monitored in four different areas in a Viennese vineyard site on leaf-forming rootstocks. Its occurrence and distribution was assessed and rated in nine categories over the vegetation period in 2010. First leaf galls were found in May, finding its peak density in August and the beginning of September followed by a decline and death until the middle of October. At their highest abundance during summer some leaf-galls could even be detected in cultivated Vitis vinifera vineyards. Based on our results we conclude that the grape phylloxera occurs in high numbers around Viennese vineyard sites and that leaf-forming rootstocks provide a habitat to the aphid from where they can further enter cultivated V. vinifera vineyards. However, more observations over several years and areas are needed to draw a definite conclusion.
Könnecke, T., Aigner, C., Specht, S., Lawo, N.C. and Forneck, A. 2011. A STEPWISE ASSESSMENT OF DAKTULOSPHAIRA VITIFOLIAE INFESTED GRAPEVINES IN A VIENNESE VINEYARD SITE. Acta Hort. (ISHS) 904:59-62
phylloxera, categories of infestation, leaf-forming rootstocks, leaf-galls, Vitis vinifera