FUNGI CAUSING MORE OB LESS DAMAGE TO USE 



FUL PLANTS. 



PEKONOSPOEACEAE. 



PERONOSPORA ARTHURI, Farlow. Mildew of evening primrose. 

 On yellow evening primrose (Oenothera biennis), covering 

 the leaves with a mass of white filaments causing them to curl, 

 lose color, and finally fall prematurely. It has been very 

 injurious to plants in the flower gardens this season, 



PERONOSPORA VIOLAE, DeBary. Violet or pansy mildew. Found 

 rarely on pansies in flower gardens. It is very injurious. 



PERISPORIACEAE. THE BLIGHTS. 



PODOSPHAERA TRiDACTYLA,(Wallr ) DeBary. Cherry blight. On 

 leaves of the common cultivated cherry (Prunus cerasus) and 

 sand cherry (Prunus pumila ). It covers the leaves with a net- 

 work of fine whitish filaments, spreading over both upper and 

 under sides. The leaves of young shoots are usually more 

 liable to injury. The fungus was especially injurious to the 

 sand cherry, often covering every leaf on a plant and causing 

 eariy dropping of the leaves; thereby hindering the proper 

 developement oi: buds and ripening of the wood. June Sept- 

 ember. 



SPHAEROTHECA PANNOSA, ( Wallr. ) Lev. Eose blight. This fung- 

 us has been observed but a few times on leaves of wild rose 

 (Rose arkansana) and once on leaves of cultivated roses. 

 It has caused little or no damage so far. July. 



