88 
ORCHARD MOTH CATERPILLARS. 
The following observations, sent by Messrs. Salmon, of Sutton 
Farm, near Hounslow, show beneficial effects of applications of Paris- 
green, even without any more special appliances for distributing the 
spray than our ordinary garden engines. On the 17th of April Messrs. 
Salmon first wrote to me mentioning that they were greatly troubled 
with the blight, and had tried sulphate of copper on some of their 
young trees, but were afraid of injuring the buds. 
In reply to the enquiries sent, I suggested trial of Paris-green, and 
six days later (on the 23rd of April) Messrs. Salmon wrote me :—“We 
are using Paris-green, and find it very effectual; we have two men on 
continually with garden engine.” 
At the end of May, being desirous to learn results, I wrote to 
Messrs. Salmon, and received the following very satisfactory reply:— 
“All we can say to it is to its advantage. It has succeeded admirably. 
The trees look healthier and better, with as much fruit (if not more) 
on as anywhere else; they are beautifully clean. It has not injured 
the foliage in the slightest. We shall always use it in case of 
blight.” 
The following is a short summary of results, and consideration of 
the position of our experimental work up to date, which was sent me 
by Capt. E. J. Corbett on the 3rd of July from Toddington:—“ I have 
lately returned from France, and have been anxious to see the result 
of the experiments in spraying. First, I will say that the proportions 
I fixed upon after the first trials, viz., 1 oz. to 10 gallons of water for 
Plums, and 1 oz. to 20 gallons of water for Apples, must not be 
exceeded. Even with these proportions I think the end of the leaves 
in some cases have been scorched. Our crop of Plums is the best we 
can hear of, though much loss has come from the Green Fly. I think 
that this pest” (caterpillar pest, Ed.) “can, and ought to be, kept 
under control, and that a more persistent course of spraying would 
have done so. Do you not think it would ? It seems to me that we 
have made a good beginning this year, and that next year we shall, by 
reason of experience gained, do a great deal better—in fact, I believe 
we can now keep the enemy under.”—(E. J. C.) 
In some cases a rather stronger proportion of Paris-green than that 
named was used safely, and in the course of June, Mr. Masters, of 
Evesham, favoured me with the following note regarding mixture of 
flour with the green:—“When the foliage of trees is young and 
tender, I do not think it safe to apply the Paris-green stronger than in 
the proportion of 1 oz. to 10 gallons of water. But when the foliage 
is matured, and the caterpillar is full-grown, a solution of 1 oz. Paris- 
green to 6 gallons of water may be safely used ; for every case it would 
be well to use about 2 lbs. of fine wheat flour to every pound of Paris- 
green ; it thickens the solution, and prevents the particles of Paris- 
