IOWA ACADEMY OP SCIENCES. 147 



DEMATIACE.E. 



Cladosparhnn carpophUum Thum. 



Rare on Prunus Americana, but abundant on Cratasgus 

 mollis late in August and September. 

 Helmintliosporium Graminum Rabb. 



Not common on Hordeum vulgare in July. 

 Cercospora Bcsedre Puck. 



Abundant on Reseda odorata in August and September. 

 C. Beticola Sacc. 



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

 September. In some cases leares completely covered 

 with cinereous spots. 

 C. angulata Winter. 



Abundant on Ribes rubrum, shrubs nearly defoliated lat- 

 ter part of July and early August. Fungus appeared 

 early in May. 



SPH.EROPSIDE.'E SPH^EROIDACE.E. 



Septoria Eubi West. 



Abundant on Rubus odoratus, R. canadensis August and 

 September. 

 SepUrria RWis Desm. 



Abandant on Ribes nigrum, June and September. 

 Melanconiace^. 

 Cylindrosporium Padi Karst. 



Abundant on Cherry. 

 Marsonia Juglandis Sacc. 



Trees of Jaglaus 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. 



BACTERIAC.E. 



Bacillus amylovorus (Barrill) Trev. 



Blight more severe than in 1694. Pyrus Malus, P. pruni- 

 folia, P. Sinensis, P. communis and P. lowensis espe- 

 cially severe on the following varieties of P. Malus: 

 Yellow Transparent apple, Red Queen-Lead, Arabskce 

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

 been severe in other parts of the state. Fruiting 

 orchards less affected than nursery stcck. It would 

 seem that the condition of the soil may influence the 



