22 N. J. Agricultural Experiment Stations Bulletin 356 



Trees More Susceptible to Disease on Some Sites than on 



Others 



It has been observed at the New Jersey station that a lot of trees 

 of a single variety may be secured from a nursery, divided and set 

 on two different pieces of land, and the two behave much differently 

 as to percentages which become diseased. One lot may suffer con- 

 siderable losses from yellows and little peach within four or five 



Fig. 12 — Tree in Foliage Showing Effect of Little Peach 



years while the other may be only slightly affected. This occurred 

 in the case of a lot of trees which were secured for planting in the 

 experiment orchard at Vineland in 1908. Those planted in the ex- 

 periment orchard suffered slight loss from yellows and little peach, 

 while some trees from the same lot set in orchard form in a garden 

 about % mile distant all became diseased by the fifth or sixth year. 

 This comparison covered trees of more than five varieties and from 

 two nurseries. Again in 1912 trees of the varieties Stump, Carman 

 and Elberta were purchased from one nursery for pruning experi- 

 ments at Vineland and New Brunswick. The trees were secured 



