90 
ORCHARD MOTH CATERPILLARS. 
made too strong; 1 lb. to 200 gallons I find very useful, and I never 
use stronger than 1 lb. to 120 gallons.”—(J. F.) 
With regard to method of application of the sjpray. —Tliis should be 
thrown so finely as to reach all parts of the tree, and both sides of the 
leaves, and coat the leaves as with a fine dew, but it should not be 
allowed to run down and drip. As soon as dripping begins spraying 
should cease. 
It should not be done whilst the trees are in blossom, and warning 
is also given in the American works that sprayings should not be given 
in rapid succession. Several days, it is advised, should elapse between, 
unless of course, as may easily happen in difficulties of first experi¬ 
ments, the spray was manifestly so weak that the application counted 
for nothing. The effect of the Paris-green on the caterpillars does not 
always show directly, and it is undesirable to waste labour and material 
where the work is already done, and only requires a day or two to show it. 
Our work was much held back at first in many ways, as all new 
introductions commonly are; partly by objections, some founded, 
some unfounded (chiefly the latter), and especially from writers who 
appeared totally unacquainted with the fact that the reason of our work 
was that the applications they advocated had been tried for years, and 
proved useless; partly also, and very greatly, we were held back by 
want of proper apparatus. As pointed out by Mr. Masters at the 
Committee-meeting at Evesham in October:—“ In this emergency 
resort was made to ordinary syringes, garden engines, or any apparatus 
at hand to spray the foliage of the trees.” . . . . “If a Strawsonizer 
could have been used, it is probable that one pint of poisoned liquid 
diffused in its misty particles would have been an ample supply to 
bedew and poison every leaf in the largest tree.” .... “Added to 
this is the irregularity of spraying, some of the boughs having a 
copious sousing, and some but very little.” 
These remarks of Mr. Masters’, of which I regret that space only 
allows me to give a portion, are well worthy of notice, and I should 
like to direct the attention of my readers to the very practical lesson 
which may further be drawn from a little calculation based on these 
observations. 
It is the very essence of our spraying work that no “drip” should 
take place, the spray should fall (or rise) as a haze and remain as dew, 
and 1 oz. of Paris-green to 10 gallons of water is the highest strength 
we recommend. This gives one-tenth of an ounce to one gallon of 
water, which would be a proportion of one-twentieth of an ounce to 
half a gallon, or two quarts, and half of this again would be the 
fortieth part of an ounce to one quart of water. Therefore, supposing 
instead of the pint of water (the amount named by Mr. Masters) 
dispersed as it should be (and quite easily could be by the Strawsonizer) 
