62 



Agricultural Experiment Station^ Ithaca, N. Y. 



at its worst early in the season dui-ing the past few years, no doubt 

 because the weather has been favorable to its spread when the 

 foliage is young. It is evident that trees with such foliage as this 

 «an neither mature a crop of apples nor lay up much store of 

 energy for the following year. Those not familiar with the 

 conditions in western New York, can have little idea of the 



wide-spread prevalence and 

 great virulence of this leaf 

 blight. Coupled with 

 poorly fed and thirsty 

 trees, it has wrought sad 

 havoc in a land which has 

 long been famous for its 

 abundance of apples. 



The colored plate also 

 shows an individual colony 

 of the apple scab fungus 

 upon a leaf, much mag- 

 nified, as it appears late in 



, 5. Blighted foliage of Fall Pippin, taken June 29. 



the season. Figs. 1, 2, and 3 represent cross sections of a leaf. In 

 Fig. 1 the leaf is healthy. Observe the regulanty of the three 

 upper layers of cells. In Fig. 2, the brown fungus may be seen 



