120 



DISEASES OF CULTIVATED PLANTS 



liberated and dispersed throughout the house. Tendrils and 

 parts of the flower behave in a similar manner when attacked. 



26. Phumopara viticola. 1, under surface of .1 vine 

 iwing white patches of mildew ; ! conidiospores 



bearing numerous conidia ; 3, three conidia more highly mat;. ; 



4, conidia containing zoospores, in b, two zoospores have 



1 from theconidium ; ;, mature oospore or resting-spore ; 



m oospore germinating and producing a conidii fter 



Prillieux) ; 7. autumnal form of conidiophore bearing a few 



large conidia (after Prillieux). Fig. 1 reduced, remainder highly 



mag. 



Oospores are produced in abundance in tin dying portions of 

 the plant. 



When a plant is attacked, the fruit, even if not directly 

 infected, suffers in consequence, and rarely matures, owing to 



