MIS< T.I.LANE0US CROPS. 



649 



Fungus Diseases of Tobacco.* 



Blue Mould. 



This disease makes its appearance particularly in seasons when the rainfall 

 is e\c.'ssi\e. It is due to a fungus, Peronospora sp. As in the case of most 

 fungus diseases, a particular relationship must exist between the weather, 

 the plant attacked, and the fundus before the latter can establish itself 



Fig. 1. — A young Tobacco plant infected with Blue Mould. 

 Note the shrivelling leaves. 



Fig. 2. — The underside of a young leaf infected with Blue Mould. 

 Showing the production of spores. [Magnified.] 



G. P. Darnell-Smith, D.Sc, F.I.C., F.C.S., Biologist. 



