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Title: Walnut Anthracnose
Author: Berry, Frederick H.;
Source: Forest Insect & Disease Leaflet 85. [Broomall, PA:] U.S. Dept. of Agriculture, Forest Service, Northern Area State & Private Forestry
Publication Series: Forest Insect and Disease Leaflet (FIDL)
Description: Walnut anthracnose, or leaf blotch as it is sometimes called, is a wide-spread and destructive disease of walnut (Juglans) species, particularly the eastern black walnut (Juglans nigra L.). It is caused by a fungus, Gnomonia leptostyla (Fr.) Ces. and de N., the imperfect stage of which is Marssonia juglandis (Lib.) Magn. The disease may quickly become epidemic during wet weather in the growing season and cause many walnut trees to lose nearly all their leaves by late July or early August. This premature defoliation slows the trees' growth and weakens them. Where premature defoliation occurs year after year, the stressed trees may die.
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Berry, Frederick H. 1981. Walnut Anthracnose. Forest Insect & Disease Leaflet 85. [Broomall, PA:] U.S. Dept. of Agriculture, Forest Service, Northern Area State & Private Forestry
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