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 mustards, 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, 117, 133 

 causing witches'-broom, 56 

 general characters, 103 

 Sac of cup fungus (Urnula), 



(Fig. 62), 141 



Saccharate of copper, 220 



Saccharomycetes (Fig. 48), 



118, 119, 120 

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

 earth-dwelling habit, 39 



Sago palms, alga: in roots of, 198 

 Sake, yeasts in, 119 



Sanitation, relation to bacteria, 



192, 193 

 Sapid fungus rot (Fig. 131), 



265, 266 

 Saprolegnia thuretii, 71 



Saprolegniinese, 



105, 106, 107, 108, 109 

 (Damping-off fungi), 108, 109 

 (Fish molds), (Fig. 42), 105, 106 

 (Sewer pipe molds), (Fig. 

 43), 107, 108 



Saprophytes, 35 



cup fungi, 142 



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, 

 186, 187), 138, J5i"-to 354 



of apple, preparation for 



soft rots, 355 



of apple, spores of (Fig. 



187) 354 



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 Lentinus rot, 267 



pore fungus rot (Fig. 125), 254 

 Schinzia cypericola, 394 



SclerodermatacctE, 183L 



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, 

 15s), 127, 128, 129, 307- 

 Scotch pine (Fig. 136), 276 

 Scurfy Pholiota rot, 363, 

 Sea weeds, red, breeding act, 140 

 Seasoning of timbers, 238. 

 Sedge root smut, 394, 

 rust. 391 

 Seed plants, higher, parasites, 



199, 200 ■ 



lower, 198 



Seed wheat, from rusted fields, 290 



Seedlings, damping-off of, 382, 383 



disease of cabbage, 339, 340 



downy mildew of (Fig. 44), 



109, 382- 

 smothering fungus of 243 



Selection for special substances, 26 

 of hosts, fungus, 26 



of varieties, 2- 



of varieties and disease 

 prevention, 206. 



