148 



GARDEN FOES. 



iiiarked, and wlirii once seen is not lilvely to be. conloiiiKlril 

 with any other form of fungous attack. The young leaves, 

 and especially those low down on the vine, are usually 

 the first to show the symptoms, which appear under the 

 form of irregularly-shaped brown blotches, half to one 

 inch across, looking like the effects of sun scald, for which 

 they might easily be mistaken but for the presence of 

 numerous minute black points scattered over the surface 

 of the diseased patches, which correspond to the fruiting 



GRAPES INFECTED WITH " Bf.'VCK ROT'' FUNGUS. 



organs of the fungus, which can be clearly seen under a 

 magnifying glass. Three or four different kinds of spore ls 

 or reproductive bodies, are produced by the fungus, each 

 of which is capable of infecting and causing the disease 

 on any leaf or fruit on which it may happen to be depo- 

 sited, providing the surface be damp ; the spores cannot 

 germinate on a dry surface. 



As a rule, about a month after the disease ha« appeared 

 on the foliaufe the fruit is attacked. Blotches of variable 



