208 
Twelve spotted cucumber beetle, 123. 
Uromyces caryophyllinus, 104. 
United States Department of Agri- 
culture, 37. 
University of Wisconsin, 37. 
Ventilation, 21. 
Ventilators : 
number, size and position of, 22. 
Verticillium albo-atrum, 34, 73, 75, 173. 
hosts of, 83. 
Verticillium collar rot of the tomato, 
63, 66. 
Verticillium lycopersici, 66. 
Verticillium wilt, 73, 84, 193. 
Verticillium wilt of cucumber and 
melon, 82. 
Verticillium wilt of sweet pea, 83. 
Verticillium wilt of tomato : 
beneficial effect of shade on, 34. 
control of, 81. 
effect of lime on, 48. 
effect of manurial treatment on, 48. 
effect of shade on, 80. 
effect of temperature on, 37. 
effect of type of growth on, 76. 
symptoms of, 74. 
temperature relations of, 76. 
Vine, 24. 
Virus diseases, 140. 
Vitality, reduced, 23. 
Vogel, 91. 
Wallflower, 59. 
DISEASES OF GLASSHOUSE PLANTS 
Wart disease of the potato, 191. 
Water, 38. 
advantages of pure supply, 30. 
analysis of nursery supplies, 29. 
careless splashing of, 25. 
Watering, 25. 
effect of insufficient, 25. 
effect on physical condition of 
soil, 25. 
excessive, 25. 
overhead, 26. 
relation to infection, 25. 
surface, 26. 
sub-irrigation, 26. ; 
use of perforated hoses, 26. 
Waterlogged soil, 16. 
‘¢ Water rot,’”’ 113. 
Water supply, 29. 
from brooks and ponds, 30. 
from deep artesian wells, 29. 
in relation to disease, 29. 
from surface wells, 29. 
Wells, methods of cleansing, 174. 
Wetting agent, 176. 
Whetzel, 188. 
White fly, 149. 
Wilt, caused by waterlogging, 39. 
Wilt diseases, caused by fungi, 73. 
Woburn manurial trials, 47. 
Woods, 147. 
Wounding by woodlice or wireworm, 68. 
Yellows, 41. 
Zoospores, 59. 
Printed by Jarrold & Sons, Lid., Norwich 
