Oak Powdery Mildew (Erysiphe alphitoides)

 Oak Powdery Mildew (Erysiphe alphitoides)

Observation - Oak Powdery Mildew (Erysiphe alphitoides) - UK and Ireland. Description: On a young oak sapling. There were plenty of leaves with common spangle galls on the same sapling but I couldn't find any leaves with both galls and mildew: can anyone suggest why this might be? (See http://www.ispotnature.org/node/835498)

On a young oak sapling. There were plenty of leaves with common spangle galls on the same sapling but I couldn't find any leaves with both galls and mildew: can anyone suggest why this might be? (See http://www.ispotnature.org/node/835498)