DISEASES OF 
GLASSHOUSE PLANTS 
CHAPTER I 
HYGIENIC CONDITIONS OF GLASSHOUSES IN 
RELATION TO HEALTH AND DISEASE 
IN PLANTS 
One of the most important things that every grower of 
plants has to learn is the intimate relationship which 
exists between the health of a plant and the many factors 
- which make up its environment. A discussion of plants 
and their diseases with growers of wide knowledge and 
experience invariably culminates in a general agreement 
that the ravages of many plant diseases may be restricted, 
if not entirely prevented, by providing suitable con- 
ditions of growth. In the case of outside crops the 
cultivator is largely in the hands of the weather, but 
with those grown under glass the conditions should be 
thoroughly well under control. Great advances have 
been made in this direction since the building of the first 
commercial glasshouses, but those who have opportunity 
to study the existing appliances and methods realize 
only too well that there is yet much to learn, and that a 
great deal of very careful investigation will be needed 
before we may be reasonably satisfied with our methods, 
Situation 
It has long been recognized that the position of a 
nursery is an important factor in relation to the health 
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