206 
Phytophthora foot rot of the tomato, 63. 
Phytophthora infestans, 118, 191. 
Phytophthora parasitica, 29, 48, 58, 64, 
67, 114. 
optimum temperature for, 62. 
Phytophthora terrestria, 59, 114. 
Pig manure, 50. 
Plant hygiene, 193, 194. 
Point-rot of the tomato, 41 
Posts, 18. 
Potash : 
in relation to disease resistance, 48. 
Potato, 59, 66, 69, 84. 
Propagating soil, 16. 
Protozoa, 49. 
Prichard and Porte, 66. 
Pruning, 28. 
result of careless, 28. 
result of jagged wounds, 28. 
knives as carriers of disease, 31. 
Pseudomonas lachrymans, 126. 
Pseudomonas solanacearum, 134. 
hosts of, 134. 
Pseudoperonospora cubensis, 100. 
Puccinia chrysanthemi, 108. 
Purlins, 18. 
Pycnidia, 55, 90, 91, 103, 106, 109. 
Pythium de Baryanum, 62. 
Quanjer, 143. 
Rands and Endlows, 123. 
Resin mixtures, 183. 
Resistant varieties, 195. 
Rhizopus nigricans, 116. 
Rhizoctonia solani, 58, 71. 
hyphe of, 58. 
optimum temperature for, 62. 
Root rots, 67. : 
Roots : 
in cold damp beds, 23. 
Rose : 
bronzing of, 50, 51. 
downy mildew of, 110. 
graft disease, 91. 
leaf blotch of, 111. 
powdery mildew of, 111. 
stem canker of, 91. 
Russell, E. J., 167. 
Rusts, 48. 
Salmon, 182. 
Saponin, 183. 
Saprophytes, 54. 
Sclerotia, 69, 71, 88. 
Sclerotium rolfsw, 68. 
Sclerotium root rots of the tomato, 69. 
Sclerotium tuliparum, 71. 
Sclerotinia sclerotiorum, 88. 
hosts of, 88. 
Sclerotinia stem rot, 88. 
DISEASES OF GLASSHOUSE PLANTS 
Scorching, 20. 
Seedboxes and pots, 60. 
Selection, 191. 
Sensitive plants, 20. 
Septoria chrysanthemella, 109. 
Septoria dianthi, 106. 
Septoria lycopersici, 103. 
Setz, 70. 
Shaded positions, 34. 
Site, 14. 
Situation, 13. 
“‘ Sleepy disease,”’ 73. 
Slope : 
effect on temperature of glasshouse 
atmospheres, 14. 
relation to efficient drainage, 14. 
Smith, E. F., 123, 134. 
Soft rot of the Calla lily : 
effect of lime on, 48. 
Soil : 
biological factors, 18. 
chemical factors, 18. 
physical factors, 18. 
waterlogged, 25. 
Soil fungicides, 188. 
Soil particles, 44. 
Soil and air temperature : 
effect of marked difference between, 
36 
Soil micro-organisms, 49. 
Soil moisture, 39. 
effect on plants of an excess, 39, 
effect of a deficiency of, 41. 
Soil population, 49. 
down grade changes, 49. 
disease producing organisms, 49. 
up grade changes, 49. 
in relation to fertility, 49. 
Soil reaction, 45. 
Soil sterilization, 60, 154. 
boiler tray method, 165. 
effect on ammonia production, 155. 
effect on bacterial numbers, 155. 
effect on plant growth of different 
methods of, 169. 
Soil temperature, 36. 
Soils : 
** Sick,” 154. 
sterilization of, 154. 
Sources of infection : 
baskets and sacking, 31. 
imported plants, 30. 
nursery workers, 31. 
pruning knives, 31. 
straw manure, 30. 
water supply, 29. 
Spectrum, 18. 
Spherotheca pannosa, 111. 
Sporangia, 60. 
Sporangiophore, 60. 
Spraying, 175. 
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