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Guignardia blotch (fungus) |
Common. More serious in wet years. Brown to reddish-brown blotches appear on the leaf margins. May cause early defoliation. However, these plants lose their leaves early even when not diseased. Resembles leaf scorch, to which these plants also may be prone. Usually, does not seriously affect tree vigor. |
Refer to the PDC Fact Sheet "Leaf Spot Diseases of Shade Trees and Ornamentals" for more information. Remove fallen leaves. Chlorathalonil, mancozeb and maneb may be used at 7- to 14-day intervals during wet spring weather. Lime sulfur may be used as a dormant spray. |
