Q How can I stop aza­lea leaves turn­ing white? MARY SMITH, VIA FACE­BOOK

Garden Answers (UK) - - Problems Solved -

A Aza­lea gall is a fun­gal dis­ease that’s usu­ally worse in wet springs. It only af­fects Ja­panese aza­leas and usu­ally just a few leaves on the plant. At first the leaves look swollen, dis­torted and pale green, but as the fun­gal in­fec­tion pro­gresses, the swellings turn white as more spores are pro­duced. There is no chem­i­cal con­trol: care­fully pick off and dis­pose of the af­fected leaves be­fore they turn white.

White fun­gal swellings are caused by aza­lea gall

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