Skip to content.

Some features of this website require Javascript to be enabled for best usibility. Please enable Javascript to run.

Ministry of Agriculture, Food and Rural Affairs

Test Your Knowledge- Cucurbits

Angular lesions with hollow centres on a cucurbit leaf

Is this disease...?

or or or

That’s Right!


This is a picture of angular leaf spot. All four of these can be distinguished by the lesions they cause on the leaves:

  • Angular leaf spot produces water-soaked lesions whose centers turn brown and fall out; the lesions are confined by secondary veins resulting in an angular appearance.
  • Scab creates pale yellow-to-white lesions, somewhat angular in shape.
  • Septoria leaf spot produces white-to-light brown lesions.
  • Downy mildew lesions are angular in shape and produce a dense grey fungi or black fungal spores on the underside of the leaf.

Foliar scab lesions Septoria leaf spot Downy mildew (underside of leaf)

Next question