Nigel Cattlin / Powdery mildew (Podosphaera pannosa) on Rose (Rosa sp) buds. Cultivated in garden, Berkshire, England, UK. June.

Nigel Cattlin / Powdery mildew (Podosphaera pannosa) on Rose (Rosa sp) leaves. Cultivated in garden, Berkshire, England, UK. June.

Nigel Cattlin / Powdery mildew (Podosphaera pannosa / tridactyla) on Cherry laurel leaf undersides in a garden hedge, Berkshire, England, UK. July

Nigel Cattlin / Powdery mildew (Podosphaera pannosa / tridactyla) on Cherry laurel leaf undersides in a garden hedge, Berkshire, England, UK. July

Nigel Cattlin / Powdery mildew (Podosphaera pannosa) heavy infection around the bases of rose buds 'American Pillar', June Berkshire, England, UK.

Nigel Cattlin / Primary infection of Apple mildew (Podosphaera leucotricha) on a terminal leaf cluster at the end of the branch of an orchard tree, Berkshire, UK. June.

Nigel Cattlin / Primary infection of Apple mildew (Podosphaera leucotricha) on a terminal leaf cluster at the end of the branch of an orchard tree, Berkshire, UK. June.

Nigel Cattlin / Cucumber powedery mildew (Podosphaera fuliginea) white fungal mycelium on leaves of a fruiting cucurbit plant, Berkshire, UK, September.

Nigel Cattlin / Powdery mildew (Erysiphe betae) fungal disease on the leaf of sugar beet, Champagne region, France, September

Nigel Cattlin / Powdery mildew (Podosphaera leucotricha) fungal disease infection with ascocarps on an apple twig, New York, USA, September

Nigel Cattlin / Powdery mildew (Blumeria graminis) mycelium and cleistothecia and brown leaf rust (Puccinia triticina) pustules on a wheat leaf

Nigel Cattlin / Powdery mildew (Uncinula necator) fungal disease infection causing discoloured and split white wine grapes, Greece