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Importance - Needle cast fungi are common diseases of conifers throughout the South. Infected trees in forest stands normally recover. However, losses to nonforest conifers, such as Christmas trees and nursery seedlings, can be substantial. Eastern white, loblolly, slash, shortleaf, Virginia, and Scotch pines, as well as spruce and firs, are susceptible.
Identifying the Fungus - There are over 25 needle cast fungi known in the South. They can be identified only after examining the spores microscopically.
Identifying the Injury - Depending on the identity of the infecting fungus, needles begin to turn yellow-brown by winter or early spring. Later, the browning progresses, and fungal fruiting bodies are produced. These small, black, fruiting bodies may be bordered by brown or yellow margins, or both. In the more advanced stages, the tree has a scorched appearance.
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Close-up view of fruiting bodies
Photo by Robert L. Anderson |
