EXPERIMENT STATION REPORTS 99 



Weeds in orchard grass seed imported from France: 



Brassica monensis — a mustard. Leucanthemum vulgare — Ox-eye Daisy. 



Arabis perfoliata — Tower Mustard. L. Maxium. 



Iberis amara — Wild Candy-tuft. Tragopogon pratensis — Goat's-beard. 



Camelina sativa — False-Flax. Picris hieracioides. 



Silene Cucubalus — Bladder- Campion. Crepis biennis — Rough Hawk's-beard. 



Lychnis Vespertina — White Campion. Galium MoUugo — Great Bed-straw. 



Geranium — Geranium. Carum Carui — Caraway. 



Melilotus officinale — Yellow Melilot. Plantago lanceolata — Ribgrass. 



Medicago lupulina — Black Medick. Rumex acetosa — Sorrel Dock. 



Potentilla Norvegica — Norway Cinquefoil. R. acetosella — Common Sorrel. 



Cnicus arvense — Canada Thistle. R. crispa— Curled Dock. 



Arctium Lappa — Burdock. Holcus lanatus — Velvet Grass. 



PLANT DISEASES. 



Several diseases of farm crops which have not been observed on the 

 college farm before, seem worthy of notice. 



A TUKNIP DISEASE. 



( Alternaria Brassicce.) 



In August a serious fungous disease appeared in the turnip fields at 

 the college. The leaves were covered with dark-colored spots which 

 were the seat of the disease, these continued to increase until the leaves 

 were destroyed. Finally the roots were attacked with a bacterial disease 

 causing a wet-rot which completed the destruction of the crop. 



A MILLET DISEASE. 



■( Sderosp&ra graminicola.) 



This disease was first noticed in August by Prof. A. A. Crozier, who 

 submitted some diseased plants of German millet to me for identification. 

 Later the disease was found on Green Fox-tail-grass, 



A LETTUCE DISEASE. 



[Marsonia perforans.) 



Late in March, 1897, Mr, C. M. Norton, an extensive lettuce grower of 

 Grand Rapids, sent the consulting botanist some lettuce plants which 

 were troubled with a new spot disease. An examination of the literature 

 on lettuce diseases showed that the fungus which produced this disease 

 had been described in 1896 by Ellis & Everhart. 



This disease is much increased by surface watering and may be con- 

 trolled by sub-irrigation. The disease is confined to green-houses and 

 was first noticed by Prof. A. D. Selby of the Ohio experiment station, 



A CLOVER DISEASE. 



( Gloeospm-iurii sp . ) 



The last week in May the red clover plots showed the existence of a 

 fungous disease which attacked the leaves and finally the stems of 



