432 Rei'oiit of the Hokticulturist of the 



Chlorosis is more likely to ajDpear in wet seasons. Some varie- 

 ties, as the Diamond, are much more susceptible than others. In 

 some seasons portions of the leaves may become yellow, but event- 

 ually regain their normal color so that at the close of the season 

 the vine appears to be in a healthy condition. In other instances 

 the yellow color extends over the entire leaf ; brown, dead patches 

 appear ; the leaf curls and eventually drops from the vine. If the 

 vine loses its leaves two or three seasons in succession it is likely 

 to die. One striking peculiarity of the disease is the fact that a 

 badly diseased vine may appear by the side of a perfectly healthy 

 vine of the same variety. 



The cause of chlorosis, as given by foreign investigators, is the 

 presence of a large amount of lime in the soil which j^revents the 

 roots from taking up an amount of iron sufficient for satisfactory 

 growth. Their experiments show that the difficulty may be over- 

 come by applying a small amount of sulphate of iron around 

 affected plants. But since there are a number of good American 

 varieties that are not subject to chlorosis, perhaps the better 

 method to pursue is to plant only such varieties as are known to 

 be free from this trouble. 



The standard varieties given in the following list are, so far as 

 we know, practically exempt from chlorosis : 



Moore Early, Concord, 



Winchell, Catawba, 



Delaware, Vergennes, 



Worden, Agawam. 

 Xiagara, 



DOWNY MILDEW. 



(Plasmopara viticola (B. & C.) Berl. & DeT.) 



Description. — In some sections of the State the doAvny mildew 



causes considerable loss to the grape grower. It may attack 



nearly every portion of the current season's growth, — leaves, 



shoots and fruit Its first appearance on the leaves, that will be 



