Cylindrocladium root rot
From Bugwoodwiki
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USDA Forest Service. 1979. A guide to common insects and diseases of forest trees in the northeastern United States. Northeast. Area State Priv. For., For. Insect and Disease Management., Broomall, PA. p. 123, illus.
Root rot caused by several species of Cylindrocladium has been found in many tree nurseries in the Lake States and in eastern and southeastern United States. The preferred hosts of these soil-borne fungi are eastern white, red, and Scots pines, Norway and white spruces, eastern hemlock, black walnut, and yellow-poplar. Austrian pine, sweetgum, oak, and most of the southern pines are attacked also.
The fungi overwinter as hardy "resting" spores and attack young, newly planted seedlings. Cylindrocladium may kill seedlings as they sprout from seed or cause root rot in young seedlings. When conifers are attacked, the foliage shrivels and turns red. The foliage of hardwoods turns yellow and then a reddish brown. The roots of both conifers and hardwood seedlings will turn black when infected, and the outer bark will loosen and crack
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 Photo by Edward L. Barnard, Florida Department of Agriculture and Consumer Services, Bugwood.org |  Photo by Robert L. Anderson, USDA Forest Service, Bugwood.org |
