178 STATE HORTICULTURAL SOCIETY. 



little of it ia premature. One diseased shoot has grown from under the excised limb, 

 and there are several noticeable ones at the junction of the stem and roots. Otherwise 

 the foliage is normal and the tree appears to be healthy. 



(17) September 17, 1887. Variety, Stump-the- World. One limb was removed; four 

 were left. 



Result. — August 17, 1888. There are premature peaches and numerous diseased 

 shoots upon every limb. Some of the shoots are much branched. 



(18) September 17, 1887. Variety, Stump-the-World. One limb was removed; three 

 were left. 



Result. — August 17, 1888. This tree bears only a few peaches. On two limbs there 

 are a few prematures, and one shoot which has grown from the trunk beneath the 

 excised limb does not look perfectly*healthy. The foliage of the tree is normal, and as 

 in No, 16 the symptoms are slight. 



(19) September 17, 1887. Variety, Stump-the-World. One limb was removed; three 

 were left. 



Result. — August 17, 1888. There are premature peaches on every limb, and also 

 many diseased shoots. There are sound peaches on one branch of one limb only. 



These nineteen trees were reexamined in the autumn of 1889. All of them were then 

 yellowish and quite badly affected. Pew bore any fruit. They were again examined 

 in the autumn of 1890. At that date all of the shoot-axes were dwarfed, many winter 

 buds were germinating, and the trees bore no healthy foliage. The leaves were stunted 

 and pale green, yellowish or red. Many branches were dead, but no entire trees. They 

 bore no fruit in 1890. 



So far as I can see, the progress of the disease in these trees was not retarded by the 

 excisions. They are now neither better off nor worse than any other cases of 1887, left 

 for comparison. In 9, 16, and 18 the symptoms on the remaining limbs were not very 

 numerous in 1888, but I can not be sure that such might not have been the case in any 

 event, because sometimes the entire tree does not succumb, until the third year. 



C. — Orchard of George Gilder sieve, near Rising Sun, Delaware (G. D. Jackson, 

 tenant). — Trees set 6 years; all cases of 1887; selected out of several hundred as being 

 freest from symptoms of yellows and, therefore, most suitable for the experiment. The, 

 trees were free-growing, thrifty specimens, and in each the disease appeared to be local- 

 ized on the upper part of one limb. This was cut away next to the stem and the stump 

 was painted. 



(1) September 19, 1887. Variety, Smock. One main limb was removed; two were 

 left. 



Result. — August 18. 1888. One of the limbs bears premature peaches on all parts, 

 and also many diseased shoots. The other bears green, healthy peaches, and shows no 

 indication of disease. 



(2) September 19, 18S7. Variety, Smock. One limb was removed; four were left. 

 Result. — August 18, 1888. This tree bears healty fruit and foliage on all parts, except 



one branch of one limb. This bears premature peaches and about thirty diseased shoots. 

 The effects of the disease are also apparent in the spring foliage and in the terminal 

 growths. The union of this branch with the main limb, which otherwise seems healthy, 

 is four feet above the stump of the excised limb. 



(3) September 19, 1887. Variety, Reeves's Favorite. One limb was removed; two 

 were left. 



Result. — August 18, 1888. This tree now bears only a few peaches. There were 

 no prematures, unless a few may have ripened very early and disappeared. The foliage 

 is healthy, and the only indications of disease are copious yellows shoots on the trunk 

 at the earth's surface, just below the excised limb. 



J).— Orchard of John A. Nicholson, Leipsic, Delaware. — September 21, 1887. An 

 effort was made to cut the disease from three trees forming part of a three year-old, 

 thirty-nine-acre orchard on the farm of John A. Nicholson, near Leipsie, Delaware. 

 There were nineteen diseased trees and I selected the ones which seemed most favor- 

 able, removing large limbs. 



This orchard was not revisited, but I was told that the remainder of each tree showed 

 yellows the following season and there were 500 new cases. 



All these experiments were begun in mid-September. The next year I repeated the 

 experiments in other orchards, cutting away the limbs in August, i. e., five weeks 

 earlier. 



E. — Orchard of George Davis, Still Pond, Maryland.— Trees set nineteen years; cases 

 of 1888 ; selected from about fifty as most suitable for the experiment. The trees were very 

 large and vigorous for their age, trunks, about one foot in diameter; height, twenty-five 

 to thirty feet. I was particular in the selection of trees and cut back very severely, 



