Minnesota Plant Diseases. 



407 



Common gemmed puff-balls 



(Figs. 90, 91), 181, 182 



Composites, 



powdery mildew of (Fig. 



210), 396,397 



powdery mildew of hops on, 325 

 rust of, 387 



Cone-bearing trees, ring disease 



of, 270 



Conifers, cup fungi on, 145 



downy mildew of seedlings, 382 



rust of cowberry, 390 



sulphur fungus on, 253 



Contract of parasitism in plants 



and animals, 75 



Conversion of wood into punk, 19 

 Co-operation of state in disease 



prevention, 208 



Copper acetate (dibasic), 220 



substitute for carbonate, 220 



Copper carbonate ammoniacal, 219 



Copper saccharate, 220 



Copper salts, effect on roots, 213 



Copper sulphate, 219 



for apple orchards, 347 



for apple scab. 35 2 



for powdery mildew of 



vines, 366 



for rose leaf rust, 375 



in blue water, 215 



in bordeaux, 215 



in Hasselman's treatment, 239 

 in saccharate of copper, 220 

 Coprinus comatus (Figs. 87,88), 



178, 179 



Coral fungus (Fig. 84), 174, 175 



rot of woods (Fig. 119), 244,246 



Coral root orchid, 10 



partnership with fungus, 50 



Cordyceps (Fig. 15), 34 



Cordyceps militaris (Fig. 31), 70 



stylophora (Fig. 31), 70 



Coreopsis, sterile-fungus rot of, 329 



Corn, broom, smut of, 300 



Corn cockles, smut of, 393 



Corn, rust, 292 



Corn, smut (Figs. 148, 149), 



156, <?97, 298 



formalin not effective, 223 



poisonous to cattle, 295 



proficiency of parasitism, 58 

 stimulation by, 158 



Corrosive sublimate, 226 



for potato scab, 326 



on knife in pruning, 365 



steep, 226 



Cottonwood, leaf curl fungi on, 121 

 powdery mildew of, 272 



red knot of, 134 



rust of, 279 



Couplers, hose, for spray ap- 

 paratus (Fig. in), 228 

 Covered smut of barley, 300, 302 

 Cowberry, gall disease of, 385 

 rusts, 160 

 stem and leaf rust (Fig. 



207), 387, 389, 390 



Crabs, parasites of, 67 



Cranberry, fungus galls on, 171 



gall disease of, 385 



high bush, powdery mildew 



of, 377 



scald, 399 



Creeping pore fungus, wood 



rot, 258 



Creosote, against timber rots, 235 



to cover wounds, 205 



use to prevent rot, 237, 239 



Creosoting of timbers, 87 



Cress, white rust on, 330 



Cronartium asclepiadeum, 386 



Crops, rotation of, 205, 206 



Crowfoot, powdery mildew of, 



395. 396 



smut of, 392 



Crown rust (see rust of wheat). 

 Cruciferse, club root of, 345 



Cucumber, downy mildew of 

 (Figs. 168, 169, 170, 171), 



112, 334, 335, 336, 338 

 epidemic of mildew (Fig. 



40), 101 



powdery mildew of, 324, 325 



sclerotium disease of, 320 



wilt of, 341 



Cucurbits, wilt of (Fig. 173), 341 



Cultures, pure, of crops, 205, 206 



Cup fungi (Figs. 4, 10, 14, 61 



to 65), 117, 140, 141, 142 



brown rot of plums, 358 



canker of balsam fir, 268 



drop of lettuce, 322, 380 



earth-dwelling habit. 39 



explosive apparatus, 31 



fruiting bodies, 23 



