24 STATE HORTICULTURAL SOCIETY 



CYSTOPUS. 



228. C. canididus, (Pers.) Lev. 



Abundant early in the season on Lepidium intermedium, 

 L. Virginicitm, Capsella bursapastoris. Later, 

 oospores abundant in inflorescene of Raphanus sativa. 



229. C. tragopogonis, (Pers.) Schroet. 



Abundant in June and early July 



230. C. portulacce, (DC.) Lev. 



Abundant on Portulaca oloracca from the middle of 

 June to the first of September. 



231. C. bliti, (Bev.) DeBy. 



Abundant July, August and September on Amaranthus 

 albus, A. retroflexus. More severe on the latter species. 



232. C. cubicus, Lev. 



On Ambrosia artemisiafolid. 



233. C. impomoece-pandurance, Farl. 

 On sweet potatoes. 



SCLEROSPOBA. 



234. 8. graminicola, (Sacc.) 



Abundant during the latter part of May till middle of 

 June, destroying large numbers of young plants of 

 Setaria viridis. In whole patches it prevented the 

 maturing of seeds. 

 PLASMOPARA. 



235. P viticola, (B and C.) B. and DeT. 



Abundant. Destructive to cultivated grape. (Vitis la- 

 brusca), affecting leaf, stem and fruit. Also affecting 

 the growing of young shoots of Vit-is reparia, in some 

 cases killing the young shoots. 



236. P. halstedii (Farlow) B. and DeT. 



On Helianthus annus, II . tuberosus, SUpfaium laciuatum, 



Xanthium canadense, Centaurea. 

 BBEMEA. 



237. B. lactucce, Regel. 

 On lettuce. 



