

IOWA ACADEMY OF SCIENCES. 147 



DEMATIACE.E. 



Cladosparium carpophilum Thum. 



Rare on Primus Americana, but abundant on Crataegus 

 mollis late in August and September. 

 Helminthosporium Oraminum Rabb. 



Not common on Hordeum valgare in July. 

 Cercospora Besedce 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.EROPSIDE^E SPH^EROIDACE^E. 



Septoria Rubi West. 



Abundant on Rubus odoratu?, R. canadensis August and 

 September. 

 Septoria Bibis Desm. 



Abundant on Ribes nigrum, June and September. 

 Melanconiaceae. 

 Cylindrosporiurn Padi Karst. 



Abundant on Cherry. 

 Marsonia Juglandis Sacc. 



Trees of Jaglans cinerea nearly defoliated by middle of 

 August. Not so severe on Juglans nigra. 

 31. Martini Sacc. 



Abundant on Quercus robur; majority of leaves affected; 

 also occurred on Q. macrocarpa. 



BACTERIAC^E. 



Bacillus amylovorus (Burrill) Trev. 



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

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

 cially severe on the following varieties of P. Malus: 

 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 



