INDEX 
Lettuce, 21. 
Levin, 103. 
Light, 33. 
efiect on resistance to disease, 33. 
orange rays, 18. 
plants grown’in weak, 33. 
red rays, 18. 
in relation to plant growth, 18. 
Light intensity : 
afternoon light, 19. 
effect of roof angle on, 20. 
morning light, 19. 
Lilies, 20. 
Lime, 48. 
Lime and sulphur mixture, 125. 
Lime sulphur, 113, 182. 
Lime sulphur and flour paste, 97. 
preparation of, 184. 
Liver of sulphur, 90, 156, 182. 
Liver of sulphur and flour paste, 109, 
111, 184. 
Livingstone atmometer cup, 148. 
Lodewijks, 151. 
Low lying plains, 16. 
Lysol, 133. 
Macrosporium dianthi, 106. 
foot rot of tomato, 63. 
symptoms of, 65. 
Macrosporium solani, 119. 
M. tomato, 120. 
Malnutrition, 50. 
Mangold leaf spot, 47. 
Manx Marvel, 81. 
Massee, 73. 
Mayer, 147. 
Melons, 69, 84. 
** foot rot ’’ of, 124. 
fusarium wilt of, 86. 
resistant to wilt disease, 193. 
verticillium wilt of, 82. 
Melon “‘ canker,” 124. 
control of, 125. 
Methods of building glasshouses : 
evolution in, 19. 
Millardet, 177. 
Moisture : 
film of, 25 
Mosaic disease, 38, 140. 
abnormality due to, 141. 
carrier plants, 150. 
control of, 151. 
cross inoculations, 149. 
distortion due to, 141. 
effect of environmental conditions 
on, 151. 
host range of, 141. 
mottling, 141. 
pathological anatomy of diseased 
plants, 145. 
properties of the virus of, 148. 
205 
Mosaic disease—conid. 
symptoms of, 141. 
the determination and elimination 
of agents transmitting, 152. 
the determination and elimination 
of infection centres of, 151. 
the infectious nature of, 146. 
transmission of, 148. 
varieties immune to, 153. 
Mosaic disease of the cucumber : 
seed transmission of, 149. 
symptoms of, 144. 
Mosaic disease of the tomato: 
symptoms of, 142. 
Mulching, 26, 114. 
conservation of soil water by, 26. 
effect on crop yield, 27. 
effect on disease, 27. 
plant food supplied by, 26. 
straw, 27. 
Musbroom beds, 60. 
Mycelium, 54. 
Mycospherella citrullina, 89. 
Neighbouring highlands, 16. 
disease introduced from, 16. 
effect on drainage water passing 
through site, 16. 
height of water table depending on, 
16. 
Nursery workers, 31. 
Gdema, 42. 
of the geranium, 42. 
of the tomato, 42. 
Oidium chrysanthemi, 109. 
Orientation of glasshouses : 
effect on health and yield of the 
crop, 19. 
Ortho-nitrochlorbenzene, 169. 
Orton, 193. 
Paraffin vapours, 53. 
Parasites, 54. 
Partial sterilization, 154. 
Peronospora sparsa, 110. 
Peronospora trifoliorum, 113. 
Peronospora viiicola, 178. 
Perithecia, 55. 
Petrol vapours, 53. 
Petunia, 59. 
botrytis disease of, 34. 
Phoma, 117. 
Phoma beice, 47. 
Phosphates : 
in relation to root development, 48. 
Physiological disorders, 25. 
wilting, 33. 
Phytophthora cryptogea, 17, 29, 48, 64, 
, 114. 
optimum temperature for, 62. 
