This is not a well - known disease. It was first noticed in America about 1889 in Texas and Alabama. In 1911 it was described from North Carolina, and is now said to occur in West Virginia and Georgia. Outside of the United States it is found in Cuba, Ceylon and New Zealand. In this country at least it should not be expected to prove a serious menace to the apple. In addition to the apple it is said to affect the pear, oak, palmetto and tupelo.
The causal fungus, Septobasidium pedicillatwn, attacks the bark, cambium and wood, causing these parts to turn brown and die. Twigs and trunks are subject to infection. Lesions may ordinarily be found at a dormant bud, or at the base of a fruit spur or twig. The forking of branches also furnishes a point of attack. As a result of the work of the pathogene, spots one - half to five inches long are developed; the width varies with the size of the affected branch. In the later stage the bark becomes sunken, and the edge of the lesion is whitish and uneven.
There is little in the way of experimental data upon which to base reliable suggestions for control. It is believed by some authorities that dormant spraying will aid in reducing the amount of the injury. The removal of diseased parts followed by the application of a wound-dressing, such as coal - tar, is worthy of trial.
Wilson, G. W. Notes on three limb diseases of apple. Thelephorose.
North Carolina Agr. Exp. Sta. Rept. 35: 53-55. 1912. Galloway, B. T. A new pear disease. Journ. Myc. 6:113 - 114.