360 Report op the Horticulturist of the 



known under the name of " pear blight." It is a bacterial disease 

 that has long been known but whose real nature was first discovered 

 by Dr. Burrill. It was afterwards studied very carefully at this 

 Station, by Dr. Arthur, ^ and more recently by Mr. M. B. Waite, 

 under the direction of the United States Department of Agri- 

 culture. 



Remedy. — Although the cause of the disease is now known, no 

 method of treating it has proved successful. The only thing that 

 can be done is to cut out and burn the diseased parts as soon as the 

 blight appears. This should be done j)ronipt]y, for the disease 

 spreads rapidly. The affected part should be cut below any dis- 

 coloration, back to perfectly healthy wood. Buds cut from infested 

 twigs and set in healthy stock may communicate the disease to such 

 stock. 



Among other plants that are subject to the attacks of this disease 

 may be mentioned the apple and the quince. 



Leaf Blight. — This is caused by a parasitic fungus which makes 

 its appearance early in the spring. It is first found on the new 

 leaves, where it appears as bright, reddish spots on the upper sur- 

 face. These spots rapidly increase in size, and later the leaves turn 

 brown and finally fall. It attacks the young twigs in the same 

 manner and frequently kills many of them back. When the fruit 

 is attacked the bright colored spots are first formed. These spots 

 soon become dark colored, and spread out in every direction ; the 

 surface of the pear becomes rough where attacked by the disease, 

 and at these places the growth is checked. Sometimes the fruit 

 becomes cracked as it does when attacked by the scab. This disease 

 appears to be more severe in States south of New York and in 

 regions near the Atlantic coast than it is in the interior of the State, 

 where it causes little damage except as a nursery disease. 



Remedy. — The treatment advocated for pear scab is also recom- 

 mended for this disease when it appears in the orchard. 



Peae Scab. — This disease is caused by a fungus very similar, 

 both in appearance and in the injury which it does to leaves and 

 fruit, to the apple scab fungus. It robs the leaves of the nourish- 

 ment which they are preparing for themselves and for the growth 

 of the tree and fruit ; it spots the fruit and in very severe attacks 

 causes it to become one-sided, distorted or cracked. While it does 



5 See Annual Reports of this Station, 1884: 357; 1885: 241; 1886 : 275. 



