272 seventeenth and eighteenth 



Grape Diseases. 



Downy Mildew [Plasmopora viticola (B. & C.) Berl.]. 

 So far as has been learned this disease appeared too late the 

 past season to cause serious results. The fungus attacks all 

 growing parts of the vine. On the leaves it produces pale 

 green spots, which on the under surface are covered with 

 a whitish, downy growth of spore bearing stalks. It attacks 

 the fruit when only partly grown, producing a brown rot. 

 Later the fruit is often covered with a downy coat of the 

 fungus. 



Bird's Eye Rot (Sphaceloma ampelinum De By.). This 

 disease has been reported from several localities. It occurs 

 on leaves, stems and fruit. On the latter it has a very char- 

 acteristic appearance, forming circular, rotten spots with 

 distinct, reddish brown margins. 



« 



Raspberry Diseases. 



Anthracnose {Gleosporium venetum Speg.). This dis- 

 ease seriously affects raspberry canes and is sometimes 

 found on the leaves. On the stems it produces purple spots 

 which in the later stages of the disease have a whitish cen- 

 ter. These spots often run together producing large 

 patches of a grayish color. The parasite greatly reduces the 

 vitality of the host plant and in some cases the disease has 

 been so serious the past year as to prevent the maturing of 

 any perfect fruit. 



Crown Gall (Dendrophagiis globosiis (Toum.). The dis- 

 ease produces rough warty enlargements on the roots of the 

 plants. It is supposed to be caused by one of the slime 

 molds. 



Potato Diseases. 



Early Blight [Alternaria solani (Ell. et Mart.) Jones & 

 Grout]. This disease appears early in the season but does 

 not usually become very destructive until the plants have 

 passed their stage of greatest vigor. It does not attack 



