Recent Studies on Peach Yellows and Little Peach 47 



A tree diseased with yellows, therefore, behaves in practically the 

 same manner as a girdled or winter-injured tree, with the exception 

 of the production of the characteristic shoots. If we consider that 

 the interference with the transfer of plant-food varies in different 

 parts of the tree and that plant-food tends to accumulate at some 

 points, it is not at all strange that "suckers" or wiry shoots push out 

 and make growth. 



Detailed Record of Peach Yellows and Little Peach Infestations 

 at the Vineland Experiment Orchards 



In the course of the fertilizer and pruning investigations with 

 peaches at Vineland, a record was made of the behavior of each tree. 

 Hence, a record has been obtained indicating the losses from the 

 various plantings because of peach yellows and little peach. This 

 record is continuous for a period of 14 years in one orchard, 13 years 

 in the second, and 9 years in the third, and, consequently, is of great 

 interest in studying the advance of the diseases. 



Plans of these orchards, showing the character of the surround- 

 ings and indicating the year in which the tree was removed and 

 whether because of yellows or little peach, are shown in plates 1 and 2. 

 The orchards designated as no. 1 and no. 2 appear in plate 1 and 

 no. 3 in plate 2. The trees that were apparently uninfected in 1920 



Table 2 



Peach Yellows and Little Peach Loss from Orchard No. 1, Vineland 



675 Trees, Planted 1907 



*It is difficult to distinguish between the two diseases on young trees before 

 they come into bearing. 



fBased on total trees in original planting. 



