152 



GARDEN FOES. 



in<] bi'i-ric's it is liable to do 



develop on the shoots, leaveis 

 serious injury to them. 



The mildew appeal's on the surfaee of the leaves, etc., 

 in the form of a greyish-white powder. The powdery 

 appearance is due to the presence of myriads of minute 

 summer spores, which are produced in enormous quanti- 

 ties, and in quick succession throughout the summer 



YINK LEiAF MILDEW. 



Showing patches of iiiildew, or summer fruit of Plaemoiiara viticola. on it^ 

 unckr surface; natural size 



months, and accumulate on the mildewed patches until 

 removed by wind or rain, and such of those as happen to 

 ahght on the damp surface of a vine leaf germinate 

 quickly, and soon produce a patch of mildew. The spores 

 are oval, and are formed in chains, the uppermost spores 

 of the chain becoming free and falling away as soon as 

 they are ripe, young spores being at the same time 



