GreenlyBlack-eyed Susan pests and diseases: how to recognise them
Rudbeckia hirta
The pests, diseases and disorders recorded for black-eyed susan in our library, each with a photo and its first symptom. Every page has the full list of symptoms, organic and chemical treatment and prevention.
At a glance
| Problems in total | 4 |
|---|---|
| Pests | 1 |
| Diseases | 3 |
| Need quick action | 2 |
Pests
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Two-spotted spider miteDiseases
Downy MildewA white, grey or purple mould on the underside of the leaf, directly below each blotch, in damp weather.Photo: Christian Hummert (Ixitixel), CC BY-SA 3.0, Wikimedia Commons
White mould (Sclerotinia)Masses of fluffy white, cotton-like mould on the affected parts, especially in cool, damp weather.Photo: Schlaghecken Josef, CC BY-SA 4.0, Wikimedia Commons.jpg/330px-Roest_op_stoksperzieboon_(Uromyces_appendiculatus_var._appendiculatus).jpg)
RustPustules are orange, yellow, brown, black or white depending on the rust; many turn dark in late summer and autumn.Photo: Rasbak, CC BY-SA 3.0, Wikimedia Commons
Which black-eyed susan problems need quick action?
These spread or do lasting harm fast; check the plants and start treatment the day you see them.
- Downy Mildew: Badly affected leaves shrivel and turn brown or yellow and fall early; plants become stunted and some may die.
- White mould (Sclerotinia): Later, hard black seed-like bodies (sclerotia) 0.5–1 cm across in the mould and inside hollow stems.
Plants with many of the same problems
Which plants each problem affects: sources
The links between these problems and the plant were checked against these pages.
