Minnesota Plant Diseases. 



415 



Knot, black, 



of plum and cherry (Fig. 



191), 358, 359, 36o 



Knot of pine (Fig. 136), 275, 276 

 Knot, red, of currants, 322, 323 



Kohlrabi, black rot of, 342 



Kumys, yeasts in, 119 



Labrador Tea, galls on (Fig. 



37), 82,83,171 



Laboulbeniineae, 139, 140 



Larch, canker, European, 268 



killed by parchment pore- 

 fungus (Fig. 36), 81 

 parchment pore-fungus rot, 258 

 weeping fungi on, 169 

 Larva*, molds on, 115 

 Lead arsenate, for apple orch- 

 ards, 347 

 Leaf blight of celery, 328 

 of strawberry, 323, 324 

 Leaf blister of oak, 272 

 Leaf curl, 120 

 fungi, and plum pockets, 362 

 fungi, witches'-broom of 



cherries, 363 



fungi, leaf habit of, 62 



Leaf, destroyers of, 80 



-dwelling habit, 41 



-dwelling fungi, agents of 



disintegration of debris, 41 

 fall of, caused by imperfect 



fungi, 152 



green, absent from fungi, 7 



-inhabiting parasites, condi- 

 tions of, 62, 163 

 rust of apple and pears 



(Figs. 181, 182), 347, 348, 349 

 rust of ash, 277 



rust of birch, 279 



rust of clover, , 292 



rust of pine, 276, 277 



rust of plum, 350, 351 



rust of rose (Figs. 199, 200, 



201), 375 



rust of willow (Fig. 138), 279 



Leaf smut of onion, 320 



of rye, 303 



Leaf spot (Fig. 70), 149, 150, 151, 152 



destroyer of small areas 



(Fig. 35), 78,79 



diseases, 138 



habit of, 62 



of alfalfa, 309 



Leaf spot, 



of beets, 328 



of clover, cup fungus, 309, 310 

 of strawberry (Fig. 35), 79 



of violets, 381, 382 



Leaf wart of dandelion, 399 



Leaves, rusts on, 164 



tar spots on, 142 



Leguminous plants, bacteria of, 196- 



Lentinus lepideus (Fig. 116), 



236, 26? 

 scaly, rot, 267 



Lenzites abietina, 266 



betulina (Fig. 86), 177 



of pine, 266 



Lepiota (Fig. 8), 20- 



procera (Fig. 18), 39 



Lettuce, downy mildew of, 



112, 337, 339- 



drop, 322, 380, 381 



grey mold of, 380 



sclerotium disease of, 322 



sterile-fungus rot of, 329 



Lice, plant, molds on, 116 



Lichen (Fig. 21), 48- 



-forming fungi, 145, 146 



Life methods of fungi, 35, 



processes in plants, 91 



Light-forming bacteria, 194 



influence on bacteria, 192 



Lightning, wounds caused by, 47 



Lignin, 40 



action upon, by wood-dwell- 

 ing fungi, 40 

 disintegration of, 85 

 in wood walls, 85. 86 



Lilac, powdery mildew (Fig. 

 202), 125, 377 



Lilies, rust of, 386 



Lime and sulphur, for downy 

 mildew of onion, 334 



powder, 227 



Lime, for club root, 346 



for onion smut, 320 



in bordeaux, 215 



in dry bordeaux, 227, 228 



in saccharate of copper, 220 



potash of, in resin bordeaux, 218 



Liquors, yeasts in, 119 



Living together with special 



plant parts, 62 



Localities, importance of, in 

 prevention, 205, 



