The Grape. 143 



ing wliitisli patches from which the mildew maybe rubbed 

 off, disclosing brown tissue beneath. Similar spots appear 

 upon affected berries. 



Treatment for this disease may be postponed until the 

 symptoms appear. Bordeaux mixture or ammoniacal solu- 

 tion of copper carbonate, sprayed upon the affected parts, 

 usually prevents serious damage. 



207'. Anthracnose is often very destructive to the grape. 

 It may appear any time during the growing season, but 

 most commonly affects the berries during the middle and 

 latter part of summer. The shoots are commonly attacked, 

 and the first indication of the disease is a darkening and 

 sinking of small, oval areas extending lengthwise of the 

 stem. These may be very numerous, giving the shoots a 

 speckled appearance. The spots gradually enlarge and the 

 center assumes a gray color, while the dark edges take on 

 a more or less decided tinge of purple. In severe cases, the 

 shoot may be wholly destroyed. Upon the leaf, the disease 

 usually attacks the veins and leaf-stems, producing similar 

 marks to those upon the shoots, but with a reddish-brown 

 color. The disease also often girdles the stems of the clus- 

 ters, causing an affection known as " ring-around." The 

 berries below this ring do not ripen and gradually shrivel. 

 On the berries the attack is marked by circular, sunken, 

 brown spots, bordered with red or purple. 



Treatment. The vines and trellises may be washed dur- 

 ing winter or early spring with a solution of sulfuric acid 

 and sulfate of iron, consisting of one hundred parts of hot 

 water, in which is placed as much iron sulfate as the water 

 will dissolve, and one part of sulfuric acid. This solution, 

 which is very caustic, is applied with a swab of rags tied 

 about the end of a stick. The solution blackens the treated 



