Minnesota Plant Diseases. 



427 



Soft, 



woods, dry rot of, 245 



Solomon's seal, false, rust of, 386 



Solomon's seal, rust of, 386 



Sordariacese (Fig. 60) 136, 137 



Sorghum blight, 314, 315 



grain smut of (Fig. 151), 299 



head smut of (Fig. 150), 



298, 299 



rust on, 292 



Spartina cynostiroides, 277 



Spathula, downy mildew of, 339 



Spontaneous combustion, bac- 

 terial, 194 

 Sphaceloma ampelinum, 367, 368 

 Sphacelotheca reiliana (Fig. 



150), 298, 299 



sorghi (Fig. 151), 299, 300 



Sphagnum, for prothallia, 384 



Sphaerella fragarire (Fig 35), 



79, 323, 324 



Sprueriacese, 137, 138 



Sphcerobolacese, 183, 184 



Sphieropsis malorum (Fig. 194) 



363, 364 



Sphserotheca castagnei, 324, 325 

 mors-uvae, 325 



pannosa (Figs. 203, 204), 



378, 379 



Sphere fungi and allies, 137, 138 



apple scab, 351 



back rot of vine, 365 



leaf blight of strawberry, 



323, 324 



Sphere-throwing fungi, 183, 184 



Spiders, parasites of, 67 



Spore, definition of 8, 21 



germination of (Fig. 15), 18, 34 

 germination and seasons, 34 

 resting, germination, 34 



succession, 26 



Spores, distribution of, 26 



distribution by animals, 30 



distribution by insects, 28 



distribution by water, 27 



distribution by wind, 27 



distribution, explosive ap- 

 paratus (Fig. 14), 31 

 kinds of (Fig. 9), 21, 22, 25 

 kinds of, from one fungus 



(Fig. 11), 25 



numbers of, 14 



Spores, 



of algal fungi, 33 



of apple scab, 354 



of ash-leaf rust (Fig. 76), 163 



of fish mold (Fig. 33), 72 



of food mold (Fig. i), 8 

 saprophytes, 37, 38 



of slime mold (Fig. 100), 197 

 of smuts germinating (Fig. 



70, 155 

 of water molds (Fig. 42), 106 

 of wheat rust (Fig. 73), 159 

 physiology of germination, 19 

 prodigality of, in fungi, 26 

 resistance to drying out, 33 

 resistance to temperature, 34 

 size and amount of nourish- 

 ment, 26 

 swimming, 27 

 unfavorable conditions in 



germination, 26 



Sporodinia grandis, 397 

 Sporidium of wheat rust (Fig. 



73), 159 



Spots, black, of grasses, 136 



of leaf, of beets, 328 

 of leaves (see leaf spots), 

 of violet leaf, 381, 382 



tar, 142 

 Spray apparatus (Figs. 102 to 



no), 211 



accessories, 231 

 fixings, tools, etc. (Fig. 



in), 228 



good, 213 



selection of, 229, 230 



special, 231 



Spray pump, complex type (Figs. 



109, no) 222, 224 

 Spraying, a check to epidem- 

 ics (Fig. 40), 101 

 a preventive method, 209 

 action of, 211 

 of fungi, best time for, 27 

 of plants, value of, 212 

 plants in rows (Fig. 112), 230 

 under sides of leaves (Fig. 



112), 230 

 Sprays, 215 

 ammoniacal copper car- 

 bonate, 219 

 bordeaux, 215 



