Large, light colored spots occur on leaves and stems.
Spots frequently have black or brownish dots near centers.
Entire leaves may be killed and often the whole plant dies from stem girdling. Spore bearing pustules appear as minute black pimples in the spots. Under a microscope, dark brown, hair-like outgrowths are visible on these pustules. Pull and burn affected plants as soon as disease appears. Spray with recommended fungicides to prevent spread.