\ 



INDEX. 



307 



Tobacco continued. 



Wilt diseases continued. 



Dutch East Indian disease continued. 



dissemination 223 



drainage, effect of 223,225 



eel-worms, relation to 221, 222, 223 



entrance of parasite into host 221 



etiology 220, 222, 224, 244 



fungi, presence of 220, 225 



Glechia solanella, relation to 223 



harvested tobacco, effect on 222, 224 



Heterodera radicicola, relation to. . . 221, 222, 223 



Honing's observations 224, 244 



(See Honing's Sumatran studies.) 



host-plants 226, 253, 254, 255 



Hunger's observations 222 



infection, manner of 221, 222, 223, 224, 225 



inoculations 222, 224, 225, 244, 245 



(See also Honing's Sumatran studies.) 



insects, relation to 221 



intercellular spaces occupied by bacteria. ... 221 



isolation of parasite 225 



Janse's observations 220 



Japanese disease, probable identity with .... 244 



Jensen's observations 224 



literature 270, 27 1 



Micrococcus sp., relation to 222 



parasite, description of 221, 223 



identity, probable, with Bact. solanacearum 



Smith 244 



inoculations with 224 



isolation 225 



longevity in soil 225 



spores, not seen 226 



[See also Bact. solanacearum (Sumatran tobacco- 

 wilt organism).] 



parts of plant attacked 221,222, 224 



Phytophthora nicotianae, relation to 223 



preventive measures 224, 226 



reaction of juice of diseased plants 225 



resistance to 224 



roots, effect on 221, 222 



saprophytes present 226 



signs of disease 220, 221, 222, 224 



soil, effect of 221, 223, 224, 225 



persistence of parasite in 225, 245 



starch, slight action on 221 



"thick bellies," relation to 223 



time of attack 222 



tissues attacked 220, 221, 222, 223, 225 



treatment 224, 226, 245 



tyloses 223 



van Breda de Haan's observations on 222 



vessels occupied by bacteria. . . 220, 221, 222, 223 



weather conditions, effect of 222 



wounds, relation to 223, 224 



yeast present 222, 225, 226 



etiology 220, 244 



French disease 266 



(See also Bacillus aeruginosus; B. putrifaciens 

 putridus; B. tabacivorus.) 



etiology 266 



Fusarium disease, Delacroix 228 



inoculations 266, 267 



literature 270 



susceptible varieties 266 



Honing's Sumatran studies 224, 244 



[See also Bacterium solanacearum (Sumatran 

 tobaeco-wilt organism).] 



Albizzia, relation to disease 225 



bacteria, parts of plant occupied by 224 



persistence of, in soil 225 



crossing tobaccos to obtain resistant race. . . . 260 

 Deli tobacco, 



degeneration of 259 



origin of 259, 260 



variations in 261, 262 



Page. 

 Tobacco continued. 



Wilt diseases continued. 



Honing's Sumatran studies continued. 



drainage 225 



etiology 244 



field observations 245 



food conditions, effect of 245 



fungi 225 



host-plants 226, 253, 254, 255 



immune race of tobacco, how obtained 259 



immune varieties of tobacco 255 



immunity tests 255 



infection, 



channels of, in plant 254 



source of 246, 254 



transmission of 254 



inoculations, 



[See Bact. solanacearum (Sumatran tobacco-wilt 

 organism).] 



irrigation-water, disinfection of 246 



irrigation-water, infection of 246 



isolation of parasite 225 



literature 270, 271 



parts of plant occupied by bacteria 224 



planted-out tobacco, effect on, of occurrence 



in seed-bed 255 



progress of disease, number of invading 



bacteria govern 260 



reaction of juice of diseased plants 225 



resistance, effect of soil 263 



resistant tobaceo.method of obtaining . 255,260,263 



resistant varieties 255 



seed-bed, disinfection of 246, 254 



seedlings, infected, use of 246, 254 



selection, in tobacco-culture 259, 260 



selection-experiments 261 



selection-methods 262 



soil, 



persistence of parasite in 225, 245 



test of, for tobacco organism 245 



treatment of 226, 245, 246, 254 



soil-exhaustion 225 



soil-infection, 



effect of 244, 246, 254 



extent of 246 



spread of disease, conditions favoring 225 



susceptible varieties 255 



transmission of disease 254 



trap-plants for detecting Bact. solanacearum 



in soil 245 



treatment 226, 245, 246, 254 



variety tests 25s, 260 



wells, Bact. solanacearum found in 246 



Indian disease 267 



[See also Bacterium solanacearum (Indian tobacco- 

 wilt organism).] 



etiology 267 



inoculations 267 



literature 271 



losses 267 



middle lamella, solution of 268 



organisms associated with 267 



parasite, description of 267 



tissues, disintegration of 268 



toxins 267 



wilting, cause of 267 



Italian disease 266 



literature 270 



Japanese disease 238 



(See also Bacillus nicotianae Uyeda.) 

 blackening 



of bundles 240 



of stem 238, 239 



cavities 243 



duration of disease 238 



Dutch East Indian disease, probable identity. 244 

 entrance of bacteria into host, manner. . 238, 239 



