642 EXPERIMENT STATION RECORD. 



The yellows is said to be an incurable disease, attacking peach trees 

 of all ages and conditions of vigor, seeming to have a preference for 

 those which are thrifty. It also attacks apricots, almonds, and Japan- 

 ese plums. It may be communicated from tree to tree, but the means 

 of communication are not known. Fertilization of the soil it is believed 

 will neither cure nor check the s^^read of the disease. The author iu 

 the summary characterizes the disease as follows: 



"Tlie oue unmistakable, symptom of yellows is the red-spotted character of the 

 fruit. The flesh is commonly mariicd by red lines or splashes beneath the spots. 

 These peaches generally ripen prematurely, and in the second year they are usually 

 smaller and often more fuzzy than the normal fruit. The second symptom to 

 appear — or the first in trees not in fruit — is the 'tip' growth. This is a sliort 

 growth starting from the uj)per or terminal buds, usually late in the season, and is 

 characterized bj' narrow, stiff, yellowish, small leaves which stand at nearly right 

 angles to the shoot. Sometimes these tips appear late in autumn, after the leaves 

 have fallen, or in spring before normal growth begins. They are often first seen 

 upon the ends of watersjirouts. This 'tip' growth is sometimes little pronounced, 

 and then only a practiced eye will detect it. 



"The third mark of the disease is the pushing out of slender, stiff-leaved, yellowish 

 shoots from the body of the tree or the sides of the large limbs. In pronounced 

 cases, or when the tree is about to die, these shoots may branch into close bunchy 

 tufts. These symptoms are freiiuently wholly absent in this state througliout the 

 entire course of the disease. 



"In its final stage the disease is marked by small and slender growth of all new 

 wood, small, narrow, yellow, or reddish foliage, and occasionally by a great profusion 

 of slender and branchy growths in the center of the tree. 



"As a rule, yellows trees die in five or six years from tlie first visible attack." 



The yellow and stunted condition caused by the peach-tree borer 

 frequently results in growths which are mistaken for peach yellows. 

 The only remedy oft'ered is the extermination of all affected trees, but 

 this will only keep the disease in check. Peach yellows is readily com- 

 municated to nursery stock by affected buds, even though the buds 

 may be from trees which do not show any signs of the disease. Pits 

 from affected trees may also be expected to i)ropagate the disease. 



The Connecticut laws relating to peach yellows are quoted, and it is 

 recommended that the provisions of these laws should be incorporated 

 in the New York law. Tlie author recommends that public sentiment 

 be aroused in favor of the law, as it will be powerless to prevent the 

 spread of the disease by the enactment of laws unless every one lends 

 his aid to carrying out their provisions. 



External characteristics of the chytridiose of the grape, A. 

 Prunet {Compt. Kend, 11!) (i^'V-^), N'o. IIJ, jip- ^(As-,S'iJ).— This disease, 

 which the author has determined as due to CUidovhytrium viticolum, is 

 one of the most widely spread diseases of the grape. Its external 

 characteristics are as follows : The internodes are more or less short- 

 ened, abnormally thickened, twisted and curved, and their surfaces 

 covered to a considerable degree with ])unctures and spots. The punc- 

 tures are slightly elevated, conical, irregularly hemispherical or linear, 

 having a diampter of 0,5 to 1 nnm, They are frequently arcauged iu 



