morphological and phylogenetic comparisons amongst powdery mildews on catalpa in the uk.three species of powdery mildew, erysiphe elevata, e. catalpae, and neoerysiphe galeopsidis were identified on catalpa species in england in 2004. a new disease record, n. galeopsidis was the first catalpa mildew to appear (in june), but it was later out-competed by e. elevata that caused the most serious damage. both mildews also attacked c. speciosa, c. xerubescens and a new host, xchitalpa tashkentensis, a chilopsis xcatalpa hybrid. no powdery mildew was detected on c. bungei, c. ovata, or c. ...200616765033
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