Encyclopedia
Plant diseases
Recognising symptoms, treatment and prevention.
Rose black spot
Black to dark-brown spots with ragged margins on rose leaves, surrounded by yellowing of the leaf blade. Infec…
1 plant in the atlasPowdery mildew
A white, powdery coating on leaves, shoots and buds. The leaves turn yellow, become deformed and drop prematur…
25 plants in the atlasDowny mildew
Yellow or angular (vein-bounded) spots on the upper leaf surface, matched underneath by a grey-violet or brown…
4 plants in the atlasRust
Rusty-orange to brown, powdery clusters of spores on the underside of leaves, matched on the upper side by yel…
3 plants in the atlasGrey mould
A grey-brown, fluffy coating of mycelium on flowers, fruit, leaves and shoots, preceded by watery, rotting spo…
6 plants in the atlasPotato and tomato late blight
Dark-brown, spreading spots on the leaves (often with a lighter margin and a whitish coating on the underside …
1 plant in the atlas