370 Eeport op the Horticulturist of the 



ish brown in color, they do not look dry. The discoloration extends 

 to the sub- epidermal tissues. 



The row of Marlborough raspberry was most affected, the leaves 

 were all curled over and the whole row looked as though blasted. 

 On July 19th I sent a diseased cane of the Marlboro to Professor 

 T. J. Burrill, of Champaign, 111. * * * * 



Again July ySth, Professor Burrill wrote : 



" It has now been satisfactorily determined that the disease of 

 raspberry and blackberry canes showing wide dark discolorations of 

 the bark without rupture of any kind is blight — ' pear blight.' I 

 have formerly suspected this, now it seems certain. We have the 

 same trouble, and this year more than I had seen before. The same 

 stems frequently are spotted with antliracnose, but the two diseases 

 are very distinct." 



]S[o treatment is recommended, but from what we know of attacks 

 of blight on pear trees, it would seem to be the part of wisdom to 

 cut out and burn the diseased canes as soon as they are noticed. 



Orange Pust. — This fungus occurs in two forms or stages on 

 the host plant, but the first stage is not commonly known. In the 

 second stage the underside of the leaves are covered with a dense 

 mass of orange colored spores, hence the name, orange rust. These 

 spore masses rarely occur on the canes. Clinton states'' that the 

 fungus enters the very young underground shoots and grows up 

 through the canes to the leaves. Since the disease grows within 

 the canes and infection probably takes place at the root, it appears 

 that any preventive treatment would be useless, other than destroy- 

 ing the infested canes at the first appearance of the disease. They 

 should be dug out and burned promptly as soon as the disease makes 

 its appearance, as it spreads rapidly and is very destructive. The 

 rust is quite common on wild plants, therefore any wild berries that 

 may be growing in the vicinity of a plantation may serve as a source 

 of infection and should be looked after accordingly. 



Strawberry. 



Leaf Blight. — This disease is also called strawberry " rust " or 

 " leaf spot." It frequently causes much damage by injuring the 

 foliage so that the plants are incapable of perfecting a full crop of 

 fruit even though a full crop has set, or as Thaxter states ^ it also 



7 Bulletin 29, Illinois Experiment Station. 



8 Annual Rep. Conn. Exp't Sta., 1889 ; 174. 



