EXPLANATION OF PLATES. 55 



EXPLANATION OF PLATES. 

 I. PEACH YELLOWS. 



I. Fig. 1, healthy fruit of Stump the World or Old Mixon, nearly full grown, 

 but still green ; Fig. 2, prematurely ripe, red-spotted peach of the same 

 variety, picked the same day from a neighboring tree, affected by yellows. 

 Photo. August 20, 1888, Dover, Del. Natural size. 



II. Growth from the trunk of a diseased tree, showing premature unfolding 

 of winter buds. Photo. December 4. 1890. Upper orchard on the grounds 

 of the State agricultural college, Amherst, Mass. 



III. Fig. 1, represents three shoots taken from the main limbs of a diseased tree 



in the autumn of 1890. The spring foliage has fallen almost completely, 

 and what remains has developed unnaturally from winter buds. Fig. 2, 

 represents a healthy shoot taken from the trnnk of a neighboring tree. 

 The droop of the foliage is due to loss of water after the shoot was pulled 

 and before it could be photograped. Photo. October, 1890, Still 

 Pond, Md. 



IV. Terminal shoots taken from diseased trees in the autumn of 1890. In Figs. 



1, 2, and 3, the spring foliage has fallen almost completely, and what 

 remains has developed unnaturally from winter buds. In Fig. 4 some of 

 the spring foliage remains. In Figs. 2 and 4 the disease has induced 

 the autumn development of blossoms. Photo. October 15, 1890, Still 

 Pond, Md. 



V. Terminal spring growths from a tree at South Haven, Mich. Branches 

 very compactly tufted for yellows, and somewhat approaching the Ro- 

 sette, but believed to be distinct, Foliage removed from one tuft to show 

 manner of branching. All above X is the growth of one season. Reduced 

 to one-half natural size. Photo. July 23, 1869. 



VI. Terminal summer and autumn growths from trees in Delaware. Fig. 1 is 

 more advanced than Fig. 2. All shoots above X and x' are the growth of 

 one season. In each very little spring foliage remains. This is the com- 

 mon appearance of the disease. Photo* Fig. I, September 27, 1887; Fig. 2, 

 September 27, 1890; Dover, Del. About one eighth natural size. 



Vila. A tree in the last stage of yellows. Diseased for several years. Smyrna, Del. 

 Photo. July 21, 1891. Orchard No. 8 of First Report. 



VII&. Represents a tree killed by yellows in 3-J- years' time, and shows branched 

 character of the last feeble growths. The entire corner was full of thrifty 

 trees, but they are now badly diseased, and the orchard has been allowed 

 to grow up to grass and weeds. Formerly it was very carefully tilled. 

 Tree became affected in the spring of 1887 and died in the summer of 1890. 

 Photo. September 30, 1890, Magnolia, Del. 



INOCULATION EXPERIMENT NO. 1. 



VIII. First results, year 1888. Three figures showing unusual number of sprouts 

 and the unfolding of the winter buds in autumn. Fig. 1, a and a' are 

 the inserted buds; a failed to grow but, a 1 grew into a vigorous shoot, 

 on which all the winter buds pushed; bbb are diseased growths from the 

 stock. Fig. 2, a and a' represent growths from the inserted buds. The 

 lower shoots are diseased growths from the stock. Fig. 3, a and a' repre- 

 sent the inserted buds ; a failed to grow, but a' grew into a branching dis- 

 eased shoot, which was cut away ; &, &', and b" are diseased growths from 

 the stock, most of b having been cut away. All the foliage is from winter 

 buds. Time, 14 months from date of inoculation. Photos. November 3, 1888. 



