IOWA ACADEMY OP SCIENCES. I47 



DEMATIACE^. 



Cladosparium caij^jophilum Thum. 



Rare on Prunus Americana, but abundant on Cratsegus 

 mollis late in August and September. 

 Helmhitliosiwrium Graminum Rabh. 



Nut common oa Hordeum vulgare in July. 

 Cercospora Resedce Fuck. 



Abundant on Reseda odorata in August and September. 

 C. Bet kola Sacc. 



Abundant on Beta vulgaris. (Sugar and mangel beets). 

 September. In some cases leares completely covered 

 with cinereous spots. 

 G. angulata Winter. 



Abundant on Ribes rubrum, shrubs nearly defoliated lat- 

 ter part of July and early August. Fungus appeared 

 early in May. 



SPH^ROPSIDE.E SPH.'EROIDACE^. 

 Septoria Rubi West. 



Abundant on Rubus odoratus, R. canadensis August and 

 September. 

 Septoria Eibis Desm. 



Abundant on Ribes nigrum, June and September. 

 Melanconiaceae. 

 Gijlindrosporium Padi Karst. 



Abundant on Cherry. 

 Marsonia Juglandis Sacc. 



Trees of Juglans cinerea nearly defoliated by middle of 

 August. Not so severe on Juglans nigra. 

 M. Martini Sacc. 



Abundant on Quercus robur; majority of leaves affected; 

 also occurred on Q. macrocarpa. 



BACTEKIAC.^. 



Bacillus amylovorus (Barrill) Trev. 



Blight more severe than in 1894. Pyrus Mains, P. pruni- 

 folia, P. Sinensi'*, P. communis and P. lowensis espe- 

 cially severe on the following varieties of P. Mains: 

 Yellow Transparent apple, Red Queen-Lead, Arabskoe 

 Antonovka, Thaler, Oldenburg. It seems, also, to have 

 been severe in other parts of the state. Fruiting 

 orchards less affected than nursery stock. It would 

 seem that the condition of the soil may influence the 



