664 



INDEX 



Aplanobacter stewarti, virulence per- 

 sistent, 161 

 Aplanobacter teutliuni (Metcalf) EFS, 



474 

 Apparatus for 



hothouse and inoculation experi- 

 ments, 86 



isolation and care of cultures, SO 



photographic room, 89 



preparation and study of sections, 81 



preparation of culture media, 77 

 Appel's potato-rot (See Bacillus phy- 

 tophthorus) 

 discovered in Germany, 64 

 Apple, fire-blight of (See Bacillus 



amylovorus) (See also under Fire- 

 blight), 359 

 Ardisia, experiments with, 44, 45 



figures illustrating, 41, 42 



mutualism in, 41, 42 

 Arthur (J. C), 2 

 Ascobacterium luteum Babes, 344, 395, 



411 

 Ash tumor, 391 



Australia, bacterial diseases found in, 52 

 Autoclaves, for sterilizing soil and pots. 

 86 



in use in pathological laboratory, 78 



Bacillus amylovorus (Burrill) Trevi- 



san. (Cause of fire-blight of 



apple, pear, quince, etc.), 359 

 acids from sugars, 371 

 anaerobic (facultative), 369 

 appearance of infected trees, 359, 



360 

 blossom-infection, 360, 374 

 cankers on pear and apple trees 



caused by, 360 

 colonies of, 378, 379, 381 

 control measures, 377, 385 

 description of, 367, 374 

 economic importance of disease 



due to, 365 

 erroneous statements respecting, 



373 

 factors favoring spread of, 13, 360, 



365 

 flagella, 367, 377 



Bacillus amylovorus, germicides, 71, 

 365, 386 

 growth on or in, 



agar plates, 370 

 beef bouillon, 370 

 Cohn's solution, 371 

 gelatin plates, 370 

 milk, 370, 382 

 potato broth, 370 

 Uschinsky's solution, 371 

 hold-over blight due to, 360 

 host plants, 359 

 in bark, 359, 365 

 inoculation experiments, 374 

 in sap wood, 381 

 liquefying, 369 

 literature, 387 

 losses in United States due to, 54, 



55 

 method of isolating pure cultures 



of, 374 

 methods of control, 71, 365, 377, 



385 

 jiiost susceptible age of host,^8 

 non-gas forming, 370 

 non-nitrate reducing, 367 

 ooze from hold-over blight, 360, 367 , 



368 

 ooze from summer blight, 369, 370, 



383 

 optimum temperature for growth, 



371 

 plants susceptible to, 359 

 pruning to check, 367, 376 

 resistant varieties, 377, 385 

 ripe tissues immune, 372 

 secondary infections of, 363 

 susceptible varieties, 377 

 thermal death point, 371 

 transmission by insects, 360, 384 

 use of cyanide for disinfection, 



71 

 use of formalin for disinfection, 71 

 use of mercuric chlorid for disin- 

 fection, 365, 386 

 virulence persists, 365 

 winters over in trees, 360 

 j^ellow saprophytes may accom- 

 pany, 374 



