Distribution of cucurbit powdery mildew species in the Czech Republic

https://doi.org/10.17221/10511-PPSCitation:Křístková E., Lebeda A., Sedláková B., Duchoslav M. (2002): Distribution of cucurbit powdery mildew species in the Czech Republic. Plant Protect. Sci., 38: 415-416.
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The occurrence of Erysiphe cichoracearum (Ec) and Sphaerotheca fuliginea (Sf), causal agents of cucurbit powdery mildew
in the Czech Republic (CR) was studied in the period of 1995–2001. Nearly 800 leaf samples with disease symptoms
were microscopically examined. Ec is the predominating species, detected on 98% of locations. It was accompanied by Sf
on 24% of locations. The occurrence of Sf as the only powdery mildew species was proved on 2% of locations. Recent
occurrence of Sf in the CR corresponds with data on Sf fast spreading and prevailing on cucurbits in West and South
Europe. However, Ec is the strongly predominating powdery mildew species largely distributed throughout the country.
The hyperparasitic fungus Ampelomyces quisqualis was detected on 30% of samples.
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