Important Orchard Pests and Sprat Formulae. 491 



4. At the first appearance of the disease, the leaves in the lower 

 portion of center of the tree change to a light yellowish color, the 

 onter leaves of the tree often appearing perfectly normal. In old 



cases or as the disease advances, all the foliage becomes 

 affected. The haves at the hase of the young growth and in 

 the inner part of the tree commonly droop downward and curl 

 inward, giving the characteristic clutching appearance of the 

 leaves which, together with their yellowish color, is the most cer- 

 tain means of identification. The small and retarded ripening of 

 the fruit, in addition to the above foliage characteristics, is the 

 only known means of diagnosing the trouble. By a careful com- 

 parison of diseased and healthy trees in the orchard the grower 

 can soon learn more than by any amount of printed description. 

 Frequently when diseased trees have no fruit upon them it is 

 difficult to determine whether they are affected with yellows or 

 little peach or both. Yellows and little peach may be different 

 manifestations of one disease. 



REMEDY FOR PEACII YELLOWS AND LITTLE PEACH 



The remedy for little peach and for yellows is the same, viz. : 

 the removal of diseased trees. In peach growing sections, the 

 orchardists who have continued the longest as successful peach 

 growers destroy trees affected with these two diseases as soon as 

 found. How these diseases spread is unknown, but in some in- 

 stances buds from infected trees have been used in nursery bud- 

 ding and a large percentage of the resulting trees developed dis- 

 ease when two and three years old. Commercial growers recog- 

 nize the fact that diseased trees are a menace to surrounding 

 healthy ones, and the !New York State agricultural law provides 

 for their removal. 



