EXCISIONS AND RESULTS. 27 



bearing the prematures. The foliage and bark on this branch appear to be perfectly 

 normal, and I can see uo difference between the twigs bearing sound peaches and 

 those bearing diseased ones. 



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

 three were left. 



RESULT. August 17, 1888. This tree bears a great quantity of fruit and only a 

 very a little of it is premature. One diseased shoot has grown from underthe excised 

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

 Otherwise the foilage 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 19 trees were reexamined in the autumn of 1889. All of them were then 

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

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

 ter 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 many 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 Gildersleve, near Rising San, Delaware (G. D. Jackson, ten- 

 ant). 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 localized on the upper part of one limb. This was cut away next to the stem 

 and the stump was painted. 



(1) September 1 9, 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, 1887. Variety, Smock. One limb was removed; four were left. 

 RESULT. August 18, 1888. This tree bears healthy fruit and foliage on all parts, 



except one branch of one limb. This bears premature peaches and about 30 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 4 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 



