Saturday, July 24, 2010
Plant pathology:Leaf spot disease on Shasta daisy
All of my Shasta daisy plants (Leucanthemum superbum 'Becky') have become infected by a fungal leaf spot disease due to the damp weather. The two main fungi causing this are Septoria leucanthemi in which the edges of the leaf turn yellow first followed by brown spots on the leaves and Alternaria chrysanthemi in which spots on the leaves start yellow ,then turning brown and black as they die. Removing infected plants and putting them in the bin is the best option, though spraying with a fungicide may work.