DISEASES OF SPECIAL CHOPS 91 



States. It seems to be especially destructive in regions 

 of excessive humidity, particularly in the deep mountain 

 valleys of the Appalachians, where whole orchards are 

 sometimes seriously affected. 



Owing to the entirely superficial nature of the fungus 

 which causes the disease, and its habit of hibernating upon 

 the twigs, the trees should be sprayed with a strong cleans- 

 ing mixture, Bordeaux or bluestone, before the buds open, 

 and again just before the blossoms open. 

 • Fruit rot (Hypochnus sp.). — Eustace ^ first described this 

 rot of the fruit upon Baldwins and Rhode Island Green- 

 ings. In that it follows scab it is similar to pink rot, to 

 which in appearance it also bears superficial resemblance. 

 A distinguishing feature of this disease is that there is 

 normally no large surface growth of fungus in the center of 

 the diseased spot. In this disease the rot often extends to 

 the core, while in the other similar diseases the spot is 

 shallow. 



The treatment is the same as for pinlv rot. 



Pink rot (Cephalothecium roseum Cda.). — This rot, 

 known in many states, is stated by Eustace " to be par- 

 ticularly prevalent in western New York. It follows apple 

 scab and may be recognized by the white, mildew-like 

 growth which appears in conjunction with the scab and 

 soon after entirely overgrows it. 



While the decay is really caused by the Cephalothecium, 

 the rupture made in the skin by the scab fungus is the usual 

 place of entrance. The decayed spot is shallow and slow 



1 Eustace, H. J., N.Y. (Geneva) Agr. Exp. Sta. Bui. 235, July, 1903. 



2 Eustace, H. J., N.Y. (Geneva) Agr. Exp. Sta. Bui. 227, December, 

 1902. 



