124 NEBRASKA STATE HORTICULTURAL SOCIETY. 



which the peach is grown. In some parts of the United States, 

 crown gall is the worst enemy of the peach, while in others, 

 where crown gall is unknown, peach yellows may be the greatest 

 hindrance to the successful peach crop. Since we cannot enter 

 into a discussion of all the diseases, it would perhaps be safe to 

 say that the four doing the most damage in our state are, peach 

 len,f curl (Exoascus deformans B.), brown rot {Monilm fructigena 

 Pres.), scahiCladosjJorium carpophilium Thum), and crown gall. 



Propagators are compelled to throw away a great many trees 

 which are apparently strong and vigorous, just because they 

 have those unsightly galls attached to their roots. It is not 

 known just how much damage these galls do to the tree. It is 

 certainly a disease which needs further investigation. 



The brown rot of the peach is caused hy the same fungus 

 that causes the brown rot of the plum and cherry, but it is not 

 apt to be serious on the peach. There seems to belittle danger 

 from this disease where orchards are kept properly sprayed. 

 The scab of the peach can also be controlled by spraying with 

 Bordeaux mixture. 



Leaf curl is sometimes quite troublesome in certain sections 

 of the state. It seems to thrive best in the early part of the 

 season, while the weather is still cool. Two sprayings are 

 usually sufficient to check the disease. The first should come 

 in the spring, before the buds open, because the fungus threads 

 live over on the buds. The second application comes just after 

 the petals have fallen. 



DISEASES OF THE PLUM. 



Of the six or eight diseases troubling the plum, the brown 

 rot is by far the most serious. This disease sometimes attacks 

 the flowers just as they are opening and the tree may be filled 

 with a mass of perfumed bloom one day, and the next day look 

 as though it had been struck by a southwest wind and all the 

 while a drizzling rain may be falling. The fungus causing the 

 disease is one of the most active, requiring less than two days 

 for its round of life. The rapidity with which it spreads makes 

 t very important that spraying be very thorough. Where or- 

 chards are badly infected it would be advisable to go through 



