INDEX 



675 



Colletotrichum gossypii Southworth, 



321 

 Colonies, planar enlargements with 



oblique light, 111 

 Color changes in plants, due to bacterial 



infection, 49 

 Color-chart used, 132 

 Competing saprophytes, 74 

 Confucius, sayings of, 637, 653, 656 

 Control, methods of, 68 

 Cooperation, a necessity in modern re- 

 search, 656 



Copper sulphate treatments, 69 

 Cork-formation, as a result of bacterial 



infection, 50, 233 

 Corrosive sublimate treatments, 69, 



159, 176, 386 



Cotton, angular leaf-spot of, 314. (See 



also Bacterium malvacearum.) 



black arm and boll rot, other 



forms of, 314 

 description of causal organism, 



321 



distortion of leaves due to, 282 

 early stages of the disease, 316 

 economical importance, 321 

 figures illustrating, 314, 315, 316, 

 318, 319, 321, 322, 323, 324, 

 333 

 geographical distribution, 54, 55, 



317, 319 

 histology, figures illustrating, 



320, 338 



history of disease, 314 

 infection may be early, 316 

 inoculation experiments, 331 

 late stages of the disease, 317 

 literature, 339 



method of isolating the or- 

 ganism, 330 



method of transmission, 337 

 prevalent in China, 319 

 prevalent in South Africa, 54, 



317, 319 



prevalent in Turkestan, 317 

 spot disease versus vein disease, 



316, 317 



stomatal infections in, 317 

 type of disease, 314 

 Crandall camera for field work, 91 



Crown gall, 413. (See also Bacterium 



tumefaciens.) 

 a hyperplasia, 413 

 animal inoculations with organism 



causing, 36 



bearing leafy shoots, 419 

 cells not killed by the parasite, 413 

 chlorophyll in tumor strand, 459 

 conversion of adjacent normal cells 



into tumor cells, 431 

 crushing effect of tumor cells, 468 

 description of causal organism, 421 

 disorientation of cells in, 455, 460, 



467, 470 

 dwarfing of infected plants, 49 



414, 415, 417, 436 

 early stages, 459 

 effect on host plant, 417 

 embryomas, illustrations of, 435, 



436, 437, 439, 440, 442, 443, 444, 



447, 448, 452, 456, 458 

 etiology, 421 

 figures illustrating, 413, 414, 415, 



416, 418, 420, 422, 423, 432, 



450 



flower buds from, 437 

 found in France and Italy, 66 

 found in South Africa, 54 

 geographical distribution, 413, 421 

 growth, extra physiological, 417 

 growth from cambium, 417 

 growth from cortical parenchyma, 



417 



growth stimulus extending be- 

 yond the tumor cells, 460, 468 

 hairy root, 421 

 histology, figures illustrating, 428, 



429, 430, 431, 433, 434, 443, 454, 



455, 464, 465, 467, 470 

 host plants, 430 

 inoculation experiments, 438, 449, 



451 



invasive tumor cells, 460, 468 

 killing effects, 449 

 iignin on bark parenchyma cells, 



430 



literature, 471 



method of control in rose houses, 73 

 method of infection in South 



Africa, 15 



