672 



Bean-blight, resemlilance to other 

 yellow organisms, 287 

 rust-red margins of spots, 288 

 seeds infected, 284, 297 

 selection of material for sections, 294 

 stomatal infection, 284, 285, 289 

 stomatal ooze in, 282 

 susceptible varieties of beans, 290, 



291 

 temperature relations, 291 

 time required to infect, 290 

 troublesome nature of, 55, 285 

 type of disease, 280 

 Bees, agents in transmission of plant 



diseases, 25, 30 

 Beetles, agents in transmission of plant 



diseases, 30 

 Begonia, bacterial leaf spot of, 474 

 Begonia hybrids and phyllomania, 575 

 Begonia phyllomaniaca, 568, 571-628 

 a hybrid, 575 



amount of water needed by, 615 

 buds from trichomes, 616, 617 

 comparison with BryophyUum 



calycinum, 619 

 dwarfing of proliferous leaves, 594 

 embryonic tissue red, 587 

 experiments with, 574-631 

 formation of adventive shoots, 575 

 nearly free from, when un- 

 disturbed, 599 

 history of, 574, 575 

 leaf distortions in, 620 

 lenticels in, 615 

 literature on, 629 

 origin of plants experimented with, 



587 

 phyllomania in, cause of, 575, 593 

 figures illustrating, 586, 588, 591, 

 594, 602 

 proliferations at stipule scars, 599 

 scarcity of stomata in, 615, 619 

 sensitive to shock, 625 

 shoots from internodes, 577, 582, 



589, 592, 598, 608 

 shoots from leaf blades, 578, 584, 



604, 605, 61 1 

 shoots from petioles, 596, 598, 606, 



610 

 shoots from wounds, 613, 614 



Begonia phylhjmaniaca, sub-epidermal 

 storage system, 615 

 watery nature of, 587 

 Bibliographies, preparation of, 648 

 Biochemistry, subsidiary study in 



pathology, 633 

 Black arm, 314. (See Bacterium mal- 



vacearum.) 

 Black chaff of wheat. (See also Bac- 

 terium translucens var. un- 

 dulosum.) 

 distributed on seed, 20, 56 

 introduced (?) from Russia, 66 

 germicidal treatment of, 69-71 

 prevalent in Central United 

 States, 55 

 Black-leg of potato, 253. (See Black 



rot of potato.) 

 Black rot of crucifers, 145. (See also 

 Bacterium campestre.) 

 brown or black veination of 



leaves, 146, 148 

 cause of, 147 



chlorophyll, increase of, in, 157 

 destructive nature of, 148 

 dissemination by insects, 148 

 dissemination by refuse from 



cabbage houses, 156 

 dissemination by seed, 148 

 dissemination from a seed bed, 



159 

 etiology of, 147 

 figures illustrating, 145, 146, 147, 



148, 149 

 geographical distribution. 147 

 histology, figures illustrating, 



154, 155, 156, 1.58 

 host plants, 145 

 introduced into United States 



from North Europe, 159 

 literature, 159 

 means of prevention, 159 

 resistant varieties, 149 

 slugs as carriers of, 159 

 stain of vascular bundles in, 



146 

 type of infection, 145 

 variability of, 157 

 water-pore infections common 

 in, 146, 147, 148 



