DISEASES OF CULTIVATED PLANTS 493 



According to our observations the so-called Marlboro disease 

 is, in reality, two diseases. It is partly cane blight (to which the 

 variety is much subject) and partly another disease for which we pro- 

 pose the name Yellows. Plants attacked by yellows have a stunted, 

 yellowish aspect suggestive of peach yellows and Woods' Bermuda 

 lily disease, especially the latter. On fruiting canes the fruit-bear- 

 ing laterals are dwarfed, often to one-half their normal length. 

 The leaves are small, curled slightly downward at the margins and 

 faintly mottled with yellow. Some of the berries dry up without 

 ripening and those that ripen are undersized and insipid. Much of 

 the foliage withers at the same time. New canes, for the most part, 

 are not seriously checked in growth although their foliage is usu- 

 ally more or less affected. The foliage on new canes does not 

 wither and there are rarely to be found any dead spots or areas. 

 The leaves on the upper portion of the cane may be much mottled 

 while those on the lower portion are nearly or quite normal. The 

 reverse may also happen. Badly diseased canes and apparently 

 healthy ones may be occasionally found in the same stool. How- 

 ever, it is often difficult to determine whether a particular cane 

 is or is not diseased because the transition from normal caneg 

 to badly diseased ones is by imperceptible gradations. Except 

 in the later stages of the disease and when also attacked by cane 

 blight, the canes themselves do not show injury. The roots, too, 

 appear normal but more observations must be made before it can 

 be stated positively that the roots are entirely unaffected. Cause: 

 Unknown. Treatment: None. (N. Y. [Geneva] E. S. B. 226.) 



STEAWBEERY DISEASES. 



Aborted Fruits. These mishappen fruits are rarely the re- 

 sult of disease, more often they are the indirect result of imperfect 

 pollination. The effects of weather conditions in hindering pol- 

 lination and making it imperfect are well known. Some bright 

 sunny weather is all essential. 



Anthracnose. This has been found upon strawberry leaves 

 in other states ; it has given less trouble than the other foliage dis- 

 eases with us up to this time. 



Leaf-Spot or Rust. This so-called ds the most serious disease 

 of older strawberry leaves. The leaf -spot fungus (Sphaerella fra- 

 garia) matures in the old leaves. In the earlier spots on young 

 leaves three forms of fungi are found, most of which are probably 

 stages in the development of the leaf-spot fungus. This disease is 

 essentially one of the season before the crop is injured. Spraying 

 upon new plantations after picking any fruit present will usually 

 be found profitable. The practice of burning over strawberry beds 

 after picking to destroy old leaves and the fungi upon them, as well 

 as possible insects, is based upon right principles and is commonly 

 successful. 



FUNGOUS DISEASES OF THE CRANBERRY. 



Only four of the diseases thus far found attacking the cran- 

 berry cause sufficient injury to need consideration here. These are 



