Cercospora Leaf Spot
Leaf spots caused by Cercosporalythracearum may appear on crape myrtles that are
caused by the fungus Cercospora species during periods of warm, moist weather.
Yellow spots (3 to 6 inch diameter) appear on the upper leaf surface with
white-grey sporulation of the fungus on the lower leaf surface. The disease can
result in almost complete defoliation of the plant in late summer and fall in
Select resistant varieties for
new plantings. The varieties, `Fantasy,``Tonto,``Tuscarora,``Tuskegee` and `Velma`s
Royal Delight,` have exhibited resistance to Cercospora leaf spot in field
trials. The amount of resistance may vary from location to location and may
depend on particular environmental conditions. Provide good air circulation and
avoid overcrowding plants. If disease is severe enough to warrant using
chemicals for control, thiophanate-methyl, or myclobutanil as used for powdery
mildew will control Cercospora leaf spot .
Examples of Fungicides (Myclobutanil - Neem
Oil – Propiconazole - Thiophanate-methyl