Minnesota Plant Diseases. 



Urocystis, 



cepulae, 320 



occulta, 303 



violae, 393 



Uromyces, appendiculatus, 319 



caladii, 392 



caryophyllinus, 373 



trifolii, 292 



Ustilagine* (see smuts). 



Ustilago, avenae (Fig. 146), 293, 294 

 bromivora, 303 



crameri, 303 



hordei, 300, 302 



maydis (Figs. 148, 149), 297, 298 

 neglecta, 394 



nuda, 300 



tritici (Fig. 72) 157-297 



violacea, 371, 393 



Variation and predisposition, 96 

 relation to disease, 91 



Varieties, rust-proof, 97 



selection of and prevention 

 of disease, 96, 206 



Vegetable worms. 16 



Velvet-stemmed Collybia rot 



(Fig. 130), 264.265 



Venturia pomi (Figs. 183. 184, 



l8 5), 35i. 35-'. 353 



Verbena, powdery mildew of 396 

 Vertebrates, degeneration, 10 



Vetch, powdery mildew of, 395. 396 

 spring, bacteria of nudules 

 (Fig. 99). 196 



Vicia saliva, bacteria of nodules 



(Fig. 99), utf 



Vinegar bacteria. 191. 195 



Vines, anthracnose of. 307, 368 



black rot of. 365. 366 



downy mildew of (Figs. 196. 

 197. >98). 1 1-'. no. 



.?o\v. 369. 370 



powdery mildew of. 366,367 



Vineyards, disease of. 347. 365 



Violet, cluster cup rust of, 386 



downy mildew of. 112. jtf/ 



>t. 373 



smuts of. 1 58. 37 1 . jv.? 



spot of leaf, 381, 382 



sterile-fungus rot of, 329 



Wall tlower, white rust on, 330 



Water cress, white rust on, 330 



Water, 



flea, parasites of, 

 hot, method for smuts, 225, 

 molds (Fig. 42), 105, 



molds, distribution of 



spores, 



molds, on animals, 

 molds, on crabs, 

 molds, on fish, 

 molds, saprophytic habits, 

 Watermelons, downy mildew of 

 Weeping fungi (Fig. 78). 



153- 154, 169, 

 basidium of (Fig. 78), 

 Wet rot of potato (Fig. 172), 

 Wheat, brand. 



crop rotation and bacteria. 

 ergot of. 130. 



formalin treatment of stink- 

 ing smut, 221, 



loose smut of (Figs. 71. 



7-'). 155- 57. 



loosc smut of, formalin 



treatment, 



Wheat rust (see also rusts of 

 wheat ). 



(Figs. 73. 74). 159. 163 to 

 and variation, 

 distribution of spores. 

 epidemics and pure cul- 



tures. loo. 



host succession. 

 infection of grass lea! ( Fig. 



29). 



kinds of spores (Fig. lit. 

 scab, 



stinking smut of (Figs. 71. 

 1471. '55- -'V5. 



White cohosh. ru>t of, 

 piped oak, 

 rusts. formation oi' leaf gree 



in petals of hosts tlower. 

 ru-t> of inu>tards, cabbage. 



etc.. 

 Wild (lowers, cluster cup rusts 



of. 



Wild mushrooms (Fig. 89.1, 

 Wild rice, ergot on, 

 Willow blight (Fig. 134). 272. 

 leaf rust ( Fig. i.^S). 



67 

 226 

 106 



27 

 66 

 67 

 71 

 36 

 334 



245 

 166 

 340 

 297 

 196 

 307 



223 



223 



330 



180 



