Insect and Disease Control 263 



Canada, and probably in other eastern and northern peach 

 districts. 



The cause and character of the disease are obscure as in 

 the case of yellows and in many respects they appear to be 

 closely related or similar to each other. Some of the symp- 

 toms, and in part the progress of the disease, are the same 

 as in yellows. The means by which it is spread are like- 

 wise obscure. 



Course of development. 



The first evidence, which generally becomes apparent 

 late in the season after the fruit is harvested, is a peculiar 

 drooping of the leaves a short distance below the tips of 

 the branches, those at the tip remaining normal. Under 

 some conditions and in some stages, especially when the 

 foliage alone shows the effects, it is difficult to distinguish 

 this disease from yellows. If the trouble develops earlier 

 in the season and the tree is in bearing, the fruit may be a 

 little smaller and ripen slightly later than normal. This 

 may develop first on a single limb as with yellows. 



The second season these s\Tnptoms are intensified. The 

 trouble involves more, perhaps all of the tree, in case only 

 a single limb was affected the first year. The foliage char- 

 acters are pronounced though the leaves near the tips of 

 the branches may remain normal. The affected foliage 

 is a lighter shade of green. All the fruit is decidedly smaller 

 on the affected parts of the tree and is about ten days or 

 two weeks later in ripening than normal for the variety, 

 the flavor is poor and insipid, and the texture is stringy. 

 The third and fourth years the foliage is very small, more 

 or less scanty, the leaves at the tips are affected and in some 

 varieties the outer third of each leaf turns back on itself. 



