PERONOSPORA VITICOLA. 



223 



On the full-grown grapes the fungus does not do so much 

 harm, but may still prevent the further maturing of the fruit. 

 The best remedy for this dangerous parasite is sprinkling with 

 finely powdered sulphur, but this only takes effect in sunny 

 weather. 



Kig. 47. Peronospora viticola (after Cornu). 



12. Peronospora viticola. 



The second vine fungus is " the false mildew," Peronospora 

 viticola, which penetrates to the interior of the leaves and 

 fruit, where it spreads and kills the cells. The conidiophores 

 (Fig. 47) burst out from the stomata of the leaves in tufts. 

 The upper part is branched, and both the branches and the 



