INDEX 
A tomato eanker, 135. 
Actinonema rose, 111. 
Aeroplane type of glasshouse, 22. 
Air, changes of, 22 
a * 
circulation, 22. 
movement of, 22. 
space, 18. 
Aleurodes vaporariorum, 149. 
Alger, 49. 
Allard, 147, 148. © 
Alternaria brassice, var. Nigrescens, 99. 
Amosba-like bodies, 147. 
Ammonium earbonate, 61. 
polysulphide, 182. 
A.P.S. 1919, 182; 1918, 182. 
Ammoniacal copper carbonate, 181. 
Anchorage, 45. 
Angle of root, 18. 
Antirrhinum, 84. 
Aplanobacter michiganense, 135. 
Arum: soft rot of, 138. 
Ascospores, 56, 89. 
Aspect of houses, 18. 
Assimilatory processes, 18. 
Associations of glasshouse growers, 24. 
Aster, 59. 
Bacillus aroidee, 138. 
Bacillus carotovorus, 48, 124, 137, 138. 
Bacillus lathyri, 46, 132. 
hosts of, 132. 
Bacillus tracheiphilus, 123. 
hosts of, 123. 
Bacteria: 121. 
ammonia producing, 155. 
rapid multiplication of, 121. 
resting spores of, 121. 
the effect of high temperatures 
on, 36. 
Bacterium vesicatorium, 136. 
**Bad penny,” 113. 
Balance of plant foods, 46. 
Bars, 18. 
Baskets and sacking as sources of 
infection, 31. 
Beets, 69. 
Beijerinck, 146. 
Berkefeld filter, 148. 
Bittersweet, 150. 
Black nightshade, 150. 
* Blaok rot,’’ 113. 
Blosk, advantages of dividing parti- 
tions, 14. 
Blossom end rot of the tomato, 15, 41, 
42. 
effect of ammonium salts on, 42 
effect of lime on, 42. 
effect of nitrate of soda on, 42. 
effect of stable manure on, 42. 
Bordeaux Mixture, 100, 104, 107, 113, 
119, 178. 
preparation of, 178. 
Botrytis, 28, 176. 
Botrytis foot rot of the tomato, 64. 
control of, 65. ; 
organism causing, 64. 
sources of infection, 65. 
symptoms of, 64. 
Botrytis on petunias : 
effect of shade on, 34. 
Botrytis stem rot, 90. 
Botrytis rot of bulbs, 71. 
Boucquet, 147. 
Breeding, 190. 
Broadbalk wheat plots, 47. 
Brooks and Searle, 89. 
‘‘ Buckeye ” rot of tomato fruits, 25, 
29, 59, 114. 
effects of careless watering on, 25. 
in relation to process of watering,25. 
Bulb rots, 71. 
Bulbs, Botrytis rot of, 71. 
Fusarium and Penicillium rots of, 
72. 
Sclerotium disease of, 71. 
Burgundy Mixture, 119. 
preparation of, 180. 
Cabbages, 69. 
Calcium bisulphite, 65, 91, 176. 
Calcium caseinate, 183. 
Capsicum, 84. 
Carbon dioxide, 18. 
Carnation : 
** Dieback ” of, 107. 
leaf mould of, 106. 
Macrosporium leaf spot of, 106. 
powdery mildew of, 107. 
root rot, 71. 
rust of; 104. 
Septoria leaf spot of, 106. 
stigmenose of, 52. 
202 
