194 RErORT OF THE BoTANIST OF THE 



tical iu size and appearance with those found on the fruit, twigs 

 and knots. Sometimes the- spores were quite abundant, but 

 again entirely absent. 



In short, it may be said that brown spot of peaches is caused 

 by Helminthosporium carpophilum which is also sometimes para- 

 sitic on the twigs; that it often occurs on the knots and some- 

 times on the leaves, but whether it is the' cause of the knots or 

 is parasitic on the leaves we do not know. It also attacks apri- 

 cot fruits. 



Very little has been written about the disease in America. 

 Taft-^ mentions its occurrence in Michigan, and according to 

 Selby-^ it is common in Ohio. In New York it is, as yet, com- 

 paratively unimportant. Selby's experiments indicate that it 

 maj' be readily controlled by spraying with weak Bordeaux mix- 

 ture after the fruit has set. However, there is considerable 

 risk in spraying peaches in foliage and it should be avoided if 

 possible. 



A Disease of Peaches in the Nursery Cellar. — In the win- 

 ter of 1899-1900 a nurseryman had an interesting experience 

 with peach trees in his nursery cellar. The cellar contained 

 about 10,000 peach trees of several different varieties which were 

 trenched in according to the usual custom. At the time the 

 trees were put in the cellar in the fall some of them were wet 

 and others dry. In trenching them in, &and was thrown over 

 them and allowed to fall down among the branches. On the wet 

 trees considerable sand stuck to the branches. . 



About January 1 it was noticed that there was something 

 wrong with the trees having sand on their branches. It was 

 found that in many places on the branches there were sections 

 fioni one to four inches in length on which the bark was dead 

 and black or brown. About 15 per ct. of all the trees in the 

 cellar were more or less affected in this manner, but the trouble 

 was confined entirely to the trees with sand on the branches. 



"Taft, L. R., Mich. Agr. Exp. Sta. Bui. 103 : 57-58. 



"Selby, A. D., Ohio Agr. Exp. Sta. Bui. 92:224-225. Selby calls it 



brown or pustular spot." 



