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Annals of Horticulture. 



to bring to light any notice of its occurrence in Europe or 

 other parts of the globe." Dr. Smith has established by rigid 

 scientific tests what has been strenuously held by the most 

 observant growers, that the yellows is not due to any pecu- 

 liarity or defect in the soil, and that the disease is communi- 

 cable. His latest conclusions concerning its communicability 

 are as follows : The disease is contagious ; it may be con- 

 ydfows" veyed by seemingly healthy buds taken from diseased trees ; 

 only a very small portion of infective material is necessary to 

 convey the disease from tree to tree ; the disease has a long 

 period of incubation. The following propositions, while not 

 succinctly proved, appear to be well-founded : The whole tree 

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

 disease is communicated in some other way than by bud- 

 inoculation ; trees are not infected through the blossoms. 

 Everything points to some micro-organism as the cause of the 

 disease. But whatever may be the cause, strenuous legisla- 

 tion, rigidly enforced, must be relied upon to rid the country 

 of the disease. 



The peach-rosette is a disease first separated and charac- 

 terized by Dr. Smith, and his latest report* shows that it is 

 contagious and serious. It appears to be confined to Geor- 

 gia, and is most abundant on the archaean formations. It is 

 allied to yellows, but differs in the following points : The 

 more tufted character and somewhat different appearance of 

 the diseased growths ; the much greater tendency of these 

 compactly tufted growths to develop in early spring from 

 winter buds, and to appear all over the tree ; a less tendency 

 Peach- to develop sprouts upon the trunk and main limbs ; the ab- 

 rosette. sence Q f premature fruit ; the general early fall of leaves and 

 fruit on affected trees ; the fruit being small, yellowish green, 

 and more or less shriveled and gummy ; gummosis of the 

 roots : the occurrence of the disease in plums ; the much 

 more speedy destruction of affected trees. It is probable 

 that radical measures would obliterate the disease if applied 

 before it spreads further. 



The potato-blight or rot has been very abundant over a large 

 part of the United States and Canada for four or five years, 

 and much attention has been given to its treatment. There 



*Bull. i, Division Veg. Path. U. S. Dept. Agric. 45. 



