Minnesota Plant Diseases. 



409 



Dothideace;e (black knot), 



(Fig. 59), 135, 136 



Downy mildews (Fig. 44), 



80, 109, no, in 



of beans, peas, etc., 336, 337 

 of beets, 339 



of burreed elder (Fig. 45), in 

 of clovers, 314 



of cucumber, melon, etc. 

 (Figs. 1 68 to 171), 



334, 335, 336, 338 



of grape on leaf (Fig 196), 368 

 of lettuce, 337, 339 



of mustards, cabbage, etc., 331 

 of onion, 333, 334 



of potato (Figs. 166, 167) 



1 10, in, 112, 331, 332, 333 

 of seedlings, 365, 382 



of spinach, 339 



of vines (Figs. 196, 197, 



198), 368,369,370 



of violet, 384 



sucker threads of (Fig. 2), n 



Dragon flies, parasites of, 71 



Drain pipe molds (Fig. 43), 101, 108 



Drop of lettuce, 322, 380, 381 



Dry bordeaux powder, 218, 227, 229 



Dry rot (Figs. 120, 121, 122), 



245, 247, 248, 249, 250 



Dry rot fungus, 175 



strands of (Fig. 5), 15 



Duckweed, alge in, 198 



Dung, bird's-nest fungus on, 187 



constituents of, 137 



cup fungi on, 144 



-dwelling fungus (Figs. 16, 



17), 37, 38 



-dwelling fungus, sapro- 

 phyte, 37 

 fungi, spore distribution, 30 

 fungi and allies (Fig. 60), 



136, 137 



gill fungi on, 179 



Dusts, method of cure, 209, 210 



powders for, 227 



Dutchman's breeches, rust of, 386 

 Dye-forming bacteria, 194 



Early blight of potatoes, 329 



Earth, basidium-bearing fungi 



on, 154 



-dwelling fungi (Fig. 18), 38, 39 

 gill fungi on, 179 



hard skinned puff-balls on, 183 



Earth, 



long stalked puff-balls on, 182 



pore fungi on, 178 



Earth-stars (Fig. 93), 185,186 



Earth tongues, 147 



Eau celeste, 219 



Economics of diseases, 201 



Edible gill fungi (Fig. 8p), 179 



pore fungi, 178 



puff-balls, 186 



Effect of disease on anatomy of 



host, 2, 87 



of host on parasite, 88 



of parasitic fungi on tissues, 84 



Egg, hen's, fungi on, 73 



-inhabiting fungi, 44 



of carrion fungi, 188 



Elder, rust of, 386 



Electricity, effect orf bacteria, 192 



use in timber treatment, 240 



Elm, black spots on leaves, 136 



Pleurotus rot (Fig. 20), 



46, 265, 266 

 powdery mildew on (Fig. 



135), I2 5, 274 



slime flux of, 271 



velvet stemmed Collybia on, 265 



Elymus, orange leaf rust on, 291 



Endomyces decipiens, 394 



in slime flux, 271 



Endomycetaceae, 120 



Endophytic fungi, 6r 



spraying of, 211 



Endophytic parasite in cells of 



grass grain (Fig. 28), 60 



Ensilage, bacteria of, 195 



Entomophthorineze (insect 



molds), (Fig. 47), 115, 116 



Epichlce typhina, 306 



Epidemics, 100, 101, 102 



and pure cultures of crops, 206 



checked by spraying (Fig. 



40), ioi 



conditions and causes of, 102 

 examples of (Fig. 39), 99 



losses by, 201 



of downy mildews, no 



of fish molds, 107 



of mildew on cucumbers 



(Fig. 40), ioi 



of powdery mildews, 125 



prevention of, 102, 207 



state aid in combating, 208, 209 



