CONTENTS 
CHAPTER PAGE 
I. HYGIENIC CONDITIONS OF GLASSHOUSES IN 
RELATION TO HEALTH AND DISEASE IN PLANTS - 13 
Situation of a Nursery: (a) Slope, (6) drainage, (c) re- 
lation to neighbouring high land.—Glasshouse Con- 
struction: (a) Light in relation to plant growth, 
(6) glasshouse construction in relation to the light 
factor, (c) glasshouse construction in relation to air 
capacity and the ventilation factor.—The Heating of 
Glasshouses.—The Humidity of Glasshouse Atmo- 
spheres.—Watering.—Mulching.—Pruning and Train- 
ing.—Disposal of Dead and Diseased Tissues.—Sources 
of Infection of Plant Diseases: (a) Water supply, 
(6) straw manure, (c) imported plants, (d) baskets, 
sacking, etc., (e) nursery workers. 
II. DISEASED CONDITIONS OF PLANTS DUE TO 
ENVIRONMENTAL FACTORS — LIGHT, HEAT, 
HUMIDITY, SOIL, ETC. - - - - - - - - 383 
Light.—Heat.—Water: (a) Humidity of the atmo- 
sphere, (6) soil moisture.—The Soil.—The Physical 
Condition of the Soil: (a) Water-holding capacity, 
(5) food-holding capacity, (c) aeration, (d) anchorage, 
(e) degrees of compactness.—The Chemical Conditions 
of the Soil: (a) Soil reaction, (b) balance of plant foods, 
(c) soil population.—Malnutrition.—Chlorosis.—Stig- 
monose.—Gas Injury.—Diseases of Unknown Origin. 
III. DISEASES DUE TO FUNGI- - - - : - - at oe 
(1) Root Diseases: ‘‘ Damping off ”’ of tomato seedlings ; 
“damping off’ of cucumber seedlings; phytophthora 
foot rot of the tomato; botrytis foot rot of the tomato ; 
macrosporium foot rot of the tomato;  verticillium 
collar rot of the tomato; crown canker of the rose; 
fusarium root rot of the tomato; sclerotium root rot 
of the tomato; root rot of the carnation; rhizoctonia 
root rot of the sweet-pea ; sclerotium disease of bulbs ; 
botrytis disease of bulbs; fusarium and penicillium 
bulb rots. 
IV. DISEASES DUE TO FUNGI—Continued : - - - - 
(2) Wilt Diseases: Verticillium wilt of the tomato ; 
verticilium wilt of the cucumber and melon;  verti- 
cillium wilt of the sweet-pea; fusarium wilt of the 
tomato ; fusarium wilt of the cucumber and melon. 
VY. DISEASES DUE TO FUNGI—Continued - - : - - 88 
(3) Stem, Leaf, and Fruit Diseases. Stem Diseases : 
sclerotinia stem rot; stem canker of the tomato; 
botrytis stem rot of the tomato; stem canker of the 
rose; rose graft disease. Leaf diseases: Cercospora 
leaf spot of the cucumber; colletotrichum leaf spot of 
the cucumber ;_ cladosporium leaf spot of the cucumber ; 
alternaria leaf spot of the cucumber ; powdery mildew 
of the cucumber; downy mildew of the cucumber; 
tomato leaf mould or ‘‘ mildew”; leaf spot disease 
of the tomato; carnation rust; septoria leaf spot of 
the carnation; leaf mould of the carnation; macros- 
porium leaf spot of the carnation; powdery mildew 
of the carnation; ‘‘die back’ of the carnation; 
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