88 ROOT-KNOT AND ITS CONTROL. 



Page. 



Rhizoctonia, presence in plants treated for root-knot 54 



Rhode Island, occurrence of root-knot 24 



Ritzema Bos, J., on root-knot 15, 20, 22, 30, 80 



Rolfs, P. H., on root-knot 11, 17, 20, 21, 42, 60, 61, 65, 69, 80 



Root-gall, variant name for root-knot 7 



Root-knot, beaded, variant name for root-knot 7 



bibliography 8, 76-81 



breeding resistant strains of plants 71-72, 75 



causal parasite 25-41, 72, 82 



cross-inoculation experiments 22-23, 82 



depth of galls below surface of soil 41, 52 



favoring conditions of soil, moisture, etc 41-44, 73 



geographic distribution 7, 8-9, 23-25, 72 



historical notes .- 8-10, 72 



manner of introduction 23, 24-25, 37-39, 73-74 



methods of control 44-72, 74-75 



plants affected -._-.._. 10-21^72 



symptoms, description 7-8 



variant names 7, 8-9 



vitahty 22-23, 30, 42, 43^4 



Rootlets, formation above root-knot galls 39-40 



Root-rot, tobacco, control by steam sterilization 63-64 



Roots, swellings. See Galls. 



Rose, susceptibility to root-knot 8, 19 



treatment for root-knot 47-48 



Ross, Hermann, on occurrence of root-knot 12, 17, 20, 80 



Rotations, crop, for root-knot control, experiments 65-69, 74 



Riibenmiidigkeit (beet tiredness), due to a nematode 61 



Rudd, W. N., on occurrence of root-knot in greenhouses 44, 80 



Russia, occurrence of root-knot 23 



Rye, relation to control of root-knot 21, 65-69, 74 



Sahara (oases), occurrence of root-knot 23 



Sainfoin, susceptibility to root-knot 8, 17 



Salmon, E. S., on plant-breeding as related to plant disease 72, 80 



Schlechtendal, D. H. R. von, on occurrence of root-knot 14, 80 



Schroeder, C. , on control of Tylenchus dipsaci 69, 80 



Secale cereale. See Rye. 



Seed beds, methods for control of root-knot 44-48, 74 



selection. See Selection. 



Selby, A. D., on occurrence of root-knot 12,17,19,44,46-47,80 



Selection, method for production of resistant plants 72, 75 



Shamel, A. D., and Cobey, W. W., on strains of tobacco resistant to root-knot. . 71,80 



method of sterilizing soil 63 



Sheldon, J. L., on occurrence of root-knot 20, 80 



Skeels, H. C, revision of names in list of plants susceptible to root-knot 10 



Smith, R. E., and Stone, G. E., on root-knot 9, 15, 16, 22, 26, 27, 31, 36, 44. 45, 81 



Soil, character, effect upon root-knot 23, 41, 48, 73 



fresh, use for control of root-knot nematodes 45-46, 74 



infested, agency in spreading root-knot 37-39, 73-74 



treatment for eradication of root-knot 22, 44-46, 48, 63-64, 74 



Solidago spp. , resistance to root-knot 21 



Sorauer, P. , on root-knot 17, 19, 20, 80 



Sorghum, resistance to root-knot 21 



South Africa. See Africa, South. 



South America, occurrence of root-knot 9, 23, 42, 49, 61 



South Carolina, occurrence of root-knot. . 9-10, 23, 35, 43, 53-56, 57, 58, 62, 64, 65-68, 73 

 root-knot investigations. See Monetta, S. C. 



Spillman, W. J., on plant breeding --- - 72, 80 



Squash, susceptibility to root-knot 14, 22, 55, 56-57, 82 



Steam, live, use for control of root-knot 44-45, 46, 63-64, 74 



Sterilization, soil, for control of root-knot 22, 44-15, 63-64, 74 



Stift, A., on control of sugar-beet nematode 57, 59, 80 



Stone, G. E., and Smith, R. E., on root-knot 9,15,16,22,26,27,31,36,44,45,81 



on methods for control of root-knot ^ 60, 81 



Strawberry, Busceptibility to root-knot 15, 22, 38 



217 



