In considering this report, it should be remembered that 
the use of sprays and dusts as fungicides has been developed almost 
entirely in connection with orchards and plants from which a fruit 
crop is taken, With these, the problem has been chiefly the prevention 
of those types of infection which recur, year by year, on the leaves, 
blossoms, and fruit and whose effect is apparent chiefly in damage to 
leaves or in ruination of fruit. The value of fungicides to trees 
which provide ornament and shade has been inadequately tested. 
Formerly spraying of trees was much recommended, because it ought to do 
them good; but now it is the general practice of tree experts to spray 
only when there is definite need. The data here presented are among 
the first to give light on the value of spraying young growing trees 
for disease prevention, 
i Re Tehon 
