346 State Horticultural Society, 



to be infected, for fear they become affected. Should you find 

 that you have an affected tree, dig it out and burn it. Remove a 

 good portion of the soil, and replace it with good and healthy soil 

 before putting out another tree. 



This knot must not be confounded with similar knots found 

 on apple trees, caused by careless or imperfect grafting. This 

 only disfigures the tree, and is not a disease at all. 



2. Rosette. — This is a very destructive disease, but easily con- 

 trolled, as the only remedy is the ax and the torch. The cause is 

 as yet unknown. At present this disease is confined to the states 

 to the southeast of us, though it has been reported from a few 

 stations in the west. Georgia and Alabama are having some 

 trouble with it. From Mr. Wilcox we learn that the leaf buds on 

 a tree thus affected grow out in a compact tuft of leaves resembling 

 a rosette; that the leaves are of a peculiar yellowish color, much 

 larger than normal leaves, have enrolled margins, and are stiffer 

 than other leaves ; that the mere contact of this disease with healthy 

 tissue is not sufficient to introduce the disease, but that there must 

 be real union of the two tissues. Hence, it may be spread through 

 budding or root grafting. 



3. Yelloivs. — From Mr. Smith and Mr. Wilcox we learn that 

 this is an American disease, and is known to affect the almond, 

 apricot and plum as well as the peach. For some time it was con- 

 fined to a small section of Delaware and the Chesapeake region ; but 

 is now as far south as Southern Virginia, and probably as far as 

 Arkansas and Northeastern Texas. It is a perplexing and de- 

 structive disease. Its peculiar symptoms are, first, the premature 

 unfolding of the leaf buds into slender pale shoots, or into branched, 

 broom-like growths ; and, second, the red spotting and the abnorm- 

 ally early maturing of the fruit. These reddish spots extend 

 from the surface to the stone, and their presence is a sure indica- 

 tion of the disease. The yellowing of the leaves, when the disease 

 has been in the tree for several years, and from w^hich it gets its 

 name, has caused this disease to be confused with leaf curl. 



From many experiments, Mr. Smith concludes that the disease 

 is contagious; may be conveyed by seemingly healthy buds when 

 they are taken from diseased trees; that only a small amount of 

 infective material is necessary, provided it be induced to unite with 

 the growing tissues of the trees ; that the disease has a long period 

 of incubation, and that the death of the entire tree requires several 

 years. He further states that it is quite probable that the whole 

 is affected when the symptoms appear in any part of it; that the 



