the Attacks of Insects and Fungi. 
243 
prolong its action." ' This proportion would be rather too strong 
for some fruit-trees in this countr}^. Tlie strength of the mix- 
ture must, as also in the case of Paris Green, depend upon the 
age and condition of the foliage. Young, tender foliage cannot 
bear so strong a dressing as mature leaves. Much also 
depends — and this applies equally to Paris Green — upon the 
manner in which the mixture is put on. If it is sent up on the 
foliage in drenching showers it must not be so strong as if 
diffused in fine spray or mist, which is the proper method. The 
results of various experiments indicate the following pro- 
portions :■ — • 
For apple trees, 6 oz. to 100 gallons of water. 
„ pear and cherry trees, 7 oz. to 100 p:aUon8 of water. 
„ plum and damson trees, 8 oz. to 100 gallons of water. 
„ currant and filbert trees, 8 oz. to 100 gallons of water. 
It is most impor- 
tant that the manner 
of application should 
be of the most gentle 
nature. As to the 
time, it would be well 
to spray with aweakish 
solution just when the 
leaf buds begin to ex- 
pand. Spraying should 
be avoided when the 
blossoms have opened, 
and should be done 
again when the fruit 
has set, and with a 
stronger mixture. As 
the poisons may take 
some time to cause any 
effect, patience must 
be observed, and con- 
siderable time allowed 
to elapse before they 
are put on again. 
In using these 
arsenical poisons it is 
obvious that tubs, 
pails, and all vessels 
in which they are mixed must be kept solely for this puqjose. 
' Fifth Heport of tlie State Entomologist on tite Injiiriom and other Insects 
of the State of New York, 1889. 
Fig. 13. — For high Sfraying. 
