230 EXPERIMENT STATION RECORD. 



The leaves on most vines were brown, the disease being first mani- 

 fest by the appearance of irregular brownish spots. With some varie- 

 ties, as the Carignan and the Bouchet, the spots were rarely observed, 

 but the leaves took on a red color. Some leaves presented on their 

 lower surfaces a sulphur color due to the presence of the parasite among 

 the pubescence. 



The attack on the vine is described, and from the diagnosis given it 

 is considered to be due to the disease described by Viala and Sauvageau 

 as caused by Flasiiioiliphora sp. The fungus was observed in the super- • 

 ficial (!ells of the stem, tendrils, petioles, and leaf blades, as well as on 

 the surface of these organs and among the hairs. Wheu the fungus 

 appears intermingled with the ])ubescence it is seen as globular masses, 

 more or less flattened and irregular, lobed or reticulated, generally con- 

 taining small vacuoles. 



The spores, the formation of which the author describes, are oval, 

 smooth, and generally 10 to 12 •/ in diameter, although rarely only 8 or {)pt. 



Apidications of sulphur, Bordeaux mixture, and hydraulic lime in a 

 very fine powder have been made to prevent this disease without effect. 



The scald of grape leaves caused by Exobasidium vitis, Prilli- 

 Euxand Delacroix {Compt. Rend., 110 {isfji), Xo. 1, pp. lOG-108).— 

 Specimens have been received by the authors from many widely scattered 

 vineyards showing that the grapevines were suffering from " rougeot" 

 or scald. The disease is characterized as follows: The color of the 

 leaves is modified; they take on a livid shade which, by drying up, 

 becomes fawn-colored along the edge. At the same time rose-purple- 

 colored areas appear which at first slightly modify the green color of 

 the leaf, but become more intense until the central portion of the 

 still living leaf is a rose color. In the dead portions there appear efflor- 

 escent spots resembling a fine powder of plaster or lime, forming here 

 and there small thick masses of a dead white color. These are the 

 fruiting filaments of the parasite, furnished with myriads of spores. 



Specimens have been received showing the constant presence of the 

 same parasite, which differs in no respect from that described by Viala 

 and Boyer as Aureobasidium vitis. 



The slightly yellow mycelium is septate, loose, or slightly aggre- 

 gated; its ultimate branches which enter between the cells are hyaline 

 and very s^lender. In spots it bursts the epidermis and sends out tufts 

 of elongated sterile filaments upon the surface of the leaf The fertile 

 filaments frequently have massed at their extremities true basidia, 

 which carry a number of true spores at the extremity of short sterig- 

 mata. Usually the basidia terminate the mycelium, but sometimes 

 they appear laterally borne on very short branches. Some of the fila- 

 ments are very delicate, occasionally transverse celled, terminating in 

 basidia, while otiiers nuich more robust form short thick-walled bodies, 

 resembling buds, which ordinarily are sterile but in special cases put 

 out short lateral branches bearing basidia and spores. The basidia are 



