38 N. J. Agricultural Experiment Stations Bulletin 356 



none of the typical wiry shoots developed. In July, 1915, they ap- 

 peared sickly but were still alive and had not developed any ad- 

 vanced symptoms. The other trees, propagated from the apparently 

 healthy portion of the diseased tree, did not grow well, and did not 

 show any advanced symptoms of disease until after 1917. These 

 and other instances not reported in detail indicate that there may be 

 a marked difference in the virility with which buds from the same 

 tree or different trees transmit the disease. 



Propagation by June Buds 



Another method of determining the time rate of incubation of the 

 disease through the process of June budding was planned. On June 

 10, 1913, buds were taken from a Mountain Rose and from a Ray 

 tree at High Bridge which had been showing advanced symptoms of 

 yellows for two years. In other words, buds were taken from trees 

 showing unmistakable evidence of yellows for at least a year pre- 

 vious to the time of cutting the buds. Some of these buds were in- 

 serted in bearing Belle of Georgia trees on June 1 1 and others were 

 budded upon peach stock in the nursery. The buds united well upon 

 the Belle of Georgia trees and no apparent effect could be noted on 

 these trees throughout the season of 1913. Even the fruit within a 

 few inches of the inserted diseased buds ripened normally and at the 

 same time as fruit on normal trees. Symptoms of disease began to 

 develop about each inserted bud the following summer. One tree de- 

 veloped little peach in a branch where a bud from a yellows tree was 

 inserted. 



The June buds in the nursery made a good growth and no charac- 

 teristic yellows shoots developed during the season of 1913. Toward 

 the latter part of the summer, however, leaves on these June buds 

 were somewhat rolled but whether this was actually due to the dis- 

 ease is open to question, as normal trees will occasionally behave in 

 the same manner if soil conditions are dry near the end of the grow- 

 ing season. These trees, however, appeared to display this character 

 to a greater degree than normal trees. 



All of these June budded trees were transplanted from the nursery 

 row in the spring of 1914, to give them more space. None of them 

 developed characteristic yellows shoots during the season, but a few 

 of them began to show drooping and rolling of the foliage during the 

 latter part of the season. In the early spring of 1915, some of these 

 trees began to make growth in advance of normal trees, and one be- 



