| 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. ... | 2006 | 16765033 |