New York Ageicultueal Expeeiment Station. 429 



The spots may be of different colors and usually have a dark 

 border; as the spots enlarge and eat in, a seed is often exposed 

 in the center. The berries do not rot, but the tissue becomes hard 

 and wrinkled. Sometimes the disease girdles the stem of a fruit- 

 cluster, cutting off the supply of sap from the grapes beyond the 

 diseased line and causing them to shrivel and die. 



Treatment. — Anthracnose does not spread as rapidly as some- 

 other vineyard diseases, neither does it yield as readily to treat- 

 ment. When a vineyard is badly infested with anthracnose, it 

 requires prompt attention and careful treatment to control the 

 disease. It is not satisfactorily controlled by the Bordeaux mix- 

 ture treatment alone, which is recommended below for black rot 

 and mildew. It is suggested that in addition to such treatment 

 the plan be followed which is advocated by certain European au- 

 thorities, of applying a warm saturated solution of copperas (iron 

 sulphate) in sjDring when the buds are swelling, but before they 

 begin to open. One per ct. or more of sulphuric acid may be 

 added to the solution before it is applied. This solution must 

 be handled with care as it is very caustic. It is applied with swabs 

 or if the acid is not used it may be sprayed.^^ It is essential that 

 the work be done thoroughly, covering all the surface of the canes. 



Mr. T. H. King, Trumansburg, IST. Y., reports that he has 

 been successful in controlling this disease upon the Vergennes, 

 which is very susceptible to the disease, by pulling the loose bark 

 from the vines and spraying thoroughly with Bordeaux mixture 

 in the spring before the buds start and again three or four weeks- 

 later. 



BLACK EOT. 



(Laestadia hidwellii (Ell.) V. & R.) 



Description. — This disease may usually be found first on the 

 leaves, where it forms circular, bright reddish brown, or pale 

 brown spots on which there appear later little black dots or pim- 



25 Beach, N. Y. Agr. Exp. Sta. Bui. 86: 79. 1896. Lodeman, Spraying of 

 riants, pp. 45, 152, 294. 



