The peach, although fairly well acclimated in the United States, is by no means exempt from fungous, bacterial and other troubles. It is a matter of common knowledge that the peach tree is short - lived. The relatively premature disappearance of these trees is brought to pass by various factors, among which diseases and injuries assume a prominent position.
Many of the best-known diseases, such as Brown Rot and Leaf Curl, are relatively easy to control; otherwise the life of a peach tree would be even shorter. But in too many cases carelessness has allowed these two diseases to go unimpeded. It is admitted, however, that in the warmer peach-growing states the Brown Rot fungus has a decided advantage and the grower not infrequently is almost helpless, and certainly is handicapped. Leaf Curl is most troublesome farther north, particularly in localities where the springs are moist and cool. But experience has shown that in most years the proper application of recommended control-measures will reduce this disease to a profitable minimum. The control of Brown Rot and Leaf Curl is discussed on pages 275 and 282, respectively. The extreme sensitiveness of peach-foliage to spray injury makes it imperative that care be taken in the selection and application of sprays.
Peach yellows, and similar diseases, like rosette and little-peach, are best known because of their destructiveness and obscure causal nature. The best authorities gave up the unsolved problem of their causes several years ago. And today these troubles remain in obscurity, at least in this respect. Control measures for these diseases are therefore puzzling and ineffective. In many localities peach yellows is the most dreaded of all peach enemies. But for the whole United States Brown Rot and Leaf Curl are the most important diseases.