New York Agricultural Experiment Station. 355 



amount of rain that comes to wash off the applications. After the 

 fruit is marketed spraying is no longer resorted to although the 

 mildew may continue through the season on the ends of growing 

 shoots. Bordeaux mixture has not been compared with potassium 

 sulphide as a fungicide for mildew to a sufficient extent to warrant 

 an exact statement of their comparative merits, hut so far as it has 

 been used at this Station the results indicate that it is not as 

 efficient as the potassium sulphide for this pui-pose. The potassium 

 sulphide also has the advantage that it is easily prepared and leaves 

 no stain. 



Worms. — The imported Currant Worm, which has already been 

 described as injurious to currants, also attacks gooseberry foliage. 

 It may be controlled in the way advocated for treating currants 

 infested with it. See page 353. 



Grape. 



Anthracnose. — This disease attacks any tender portions of 

 the growing vine. When the leaves are affected dark spots are 

 first formed on their surface. As the disease advances these spots 

 enlarge, and irregular cracks are often formed through the dead 

 tissue. Frequently many of these small cracks run together, form- 

 ing a h)ng irregular slit through the leaf. Similar marks are formed 

 on the tender shoots, though they are not so noticeable. When the 

 fruit is attacked the disease is sometimes called bird's eye rot. Cir- 

 cular spots are formed on the surface of the berry. 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 centre. The berries 

 do not rot, but the tissue becomes hard and wrinkled. Sometimes 

 the disease girdles the stem of the fruit cluster cutting off the supply 

 of sap from the grapes beyond the diseased line and causing them 

 to shrivel and die. 



Remedies. — Anthracnose does not spread as rapidly as some 

 other vineyard diseases neither does it yield as readily to treatment. 

 When a vineyard is badly infested with anthracnose, it requires 

 prompt attention and careful treatment to control the disease. In 

 Austria and other portions of Europe, vines infested with anthrac- 

 nose are treated early in the season, when the buds are swelling, but 

 before the tips of the leaves unfold, with a warm saturated solution 

 of copperas (iron sulphate) to which ten per cent, of sulphuric acid 



