FLORIDA STATE HORTICULTURAL SOCIETY 
65 
warning against the idea that blindly 
following a set of rules will always insure 
success in spraying. Rules, however 
good, must be used with judgment; and 
judgment must be based on knowledge of 
the factors involved,—the peculiarities of 
host and parasite and spray material, and 
the surrounding conditions that govern 
their interrelationships. To knowledge 
and judgment must be added a third 
requisite—skill in manipulation, before 
one is fully equipped to cope with the 
threefold problem of spraying,—the use 
of the right material, at the right time, in 
the right way. 
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