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In the year 2000 Ampelomyces quisqualis was noted, with various intensity, in north-eastern Poland on different species of Erysiphales selected as potential bioindicators of urban pollution. The results of observation of Erysiphe sordida (on Plantago major), Sphaeroteca erigerontis-canadensis (on Taraxacum officinale) and Microsphaera hypophylla (on Quercus robur) – susceptible species, and Microsphaera palczewskii (on Caragana arborescens) – a resistant species, suggest that A. quisqualis shows affinity to some hosts regardless of their individual reactions to the level and range of anthropopressure. It clearly prefers the genera: Erysiphe and Sphaerotheca. Its effect on the degree of host plant infestation with powdery mildew under natural conditions seems insignificant.

plant protection science

Preliminary evaluation of the effect of Ampelomyces quisqualis on the degree of plant infestation with selected Erysiphales species proposed as potential bioindicators