Minnesota Plant Diseases. 



425 



Rusts, 



of wheat, differences be- 

 tween red and black rust, 



291, 292 



of wheat, epidemics, 100 

 of wheat, losses in Minne- 

 sota, 201 

 of wheat, relation to varia- 

 tion, 97 

 on limited areas, 79 

 producing pine knots, 82 

 proficiency of parasites, 59, 60 

 stimulation of new organs, 84 

 sucker threads (.Fig. 2), 11 

 white, 112 

 white, of mustarJs, cab- 

 bage, etc., 330 

 wind distribution of spores, 27 



Rutabaga, black rot of, 342 



club root of (Fig. 179), 345 



Rye. ergot of (Fig. 154), 130,307 



leaf smut, 303 

 rust (see rust of wheat). 



Sac fungi, ///, 135 



causing witches'-broom, 56 



general characters, 103 



Sac of cup fungus (Urnula), 



(Fig. 6.'.), 141 



Saccharate of copper, 220 



Saccharomycetes (Fig. 48), 



1 |8, I 19, I2O 



Saddle fungi (Fig. 67), 146, 147, 148 

 earth-dwelling habit. 39 



Sago palms. alg;e in roots of, 108 

 Sake, yeasts in. 1 19 



Sanitation, relation to bacteria, 



192. 193 

 Sapid fungus rot (Fig. 131), 



-'05. 200 



Saprolegnia thuretii. 71 



Saprolegniinex, 



105, 100. 107, 108. 109 

 ( Damping-ofT fungi). 108.109 

 ( Fi-h molds). (Fig. 4-'). 105. 100 

 (Sewer pipe molds). (Fig. 



43. 107, 108 



Saprophytes. 35 



cup fungi. 14.' 



definition of. 9 



dung-dwelling habit, 37 



earth-dwelling habit, 38 



water-mold habit. 36 



Saprophytes, 



yeast habit, 36 



Saprophytism and parasitism. 12 

 Sarsaparilla, rust of wild (Fig. 



208). 390- 



Scab of apple (Figs. 183. 184, 185. 

 1 86, 187), 138, 351 to 354 



of apple, preparation for 



soft rots, 355. 



of apple, spores of (Fig. 



187) 35-4 

 of beet, 327 

 of plum and cherries. 363 

 of potato (Fig. 164). 326- 

 of potato, formalin treat- 

 ment, 223 

 potato, corrosive sublimate 



treatment, 226 

 of wheat. 310 

 Scald of cranberry, 399 

 Scale, ring, of pine, 256 

 Scaly I.entinus rot. 267 

 pore fungus rot (Fig. 125), 254 

 Schinzia cypericola. 394 

 Sclerodermatacea-, 183 

 Sclerotinia (Figs. 4. 63). 14, 143 

 fructigena. 357. 358 

 libertiana, 320, 322. 380, 381 

 Sclerotium disease of cucum- 

 bers. 320 

 of ergot (Figs. 53, 54. 154. 



155). i-'7, 128. 129. 307 



Scotch pine (Fig. 130), 270 



Scurfy 1'holiota rot. 303 



Sea weeds, red. breeding act. 14') 



Seasoning of timbers. .-38 



Sedge root smut, 304 



HIM. 3<jl 



Seed plant-, higher, parasites. 



199. 200 



lower. 198 



Seed wheat, from rusted field-. 2</j 



Seedling.-, damping-off of. 382, 383 



disease of cabbage. 339, 340 



downy mildew of (Fig. 44). 



109. 382 



smothering fungu.- of 243 



Selection for special substances, 26 

 of ho-t-. fungii--. 26 



of varieties. 2 



of varieties and disease 



prevention. joO 



