Minnesota Plant Diseases. xxi 



FIG. 156. Flax wilt; wilted seedlings. After Bolley 311 



FIG. 157. Spores of the flax wilt fungus, highly magnified. After Bol- 

 ley 312 



FIG. 158. Flax wilt; the fungus threads around the root of an attacked 



flax plant. Highly magnified. After Bolley 312 



FIG. 159. Flax wilt; a section of a flax root, with fungus threads and 



spores at the surface. Magnified. After Bolley 313 



FIG. 160. Orange rust of raspberry and blackberry. Original 316 



FIG. 161. Winter spores of the asparagus rust. Highly magnified. 



Microphotograph by E. W. D. Hoi way 318 



FIG. 162. Rust of bean. After Clinton 319 



FIG. 163. Pore-fungus root-rot of currant. Original 3-' 



FIG. 164. Potato scab. After Clinton.. 3-'6 



FIG. 165. Anthracnose of bean. After Halsted.. 3-"* 



FlG. 166. Potato blight. Karly stages of the blight on the loaves 



After Clinton 33-' 



FlG. 167. Potato blight. Later stages on the leaves. After Clinton.. 333 

 FIG. 168. Downy mildew of nniskim-lon. Blighted vine in the field. 



After Clinton 333 



Fie. 1(19. Downy mildew of muskmelon. showing the under surface of 



an attacked leal. Alter Clinton. . 33'' 



FIG. 170. Downy mildew of nuiskindon. I'nder surface of an attacked 



leaf. Alter F. C. Stewart 337 



FIG. 171. Downy mildew of melon> and cucumbers. Spores and spore- 

 bearing threads. Highly magnified Alter Humphrey 

 and F. C. Stewart. 



FIG. l/.'. Bacterial rot of potato After Clinton.. 34" 



FIG. 173. Bacterial rot oi squash. Alter Clinton.. 34' 



FlG. 174. Black rot of cabbage. A badly inicMed field. Alter H. 1.. 



Russell .'-' 



FIG. 175. Black rot of cabbage. Artificial infection of cabbage plants. 



Alter H. L Unveil. . J43 



