70 
ORCHARD INSECTS. 
“ With regard to the Winter Moths which have been so injurious in 
England this year, I am under the impression that the most satis¬ 
factory mode of treatment will be to spray or dust the trees with some 
of the preparations of arsenic. For my own part I prefer ‘Paris- 
green,’ as being of more uniform strength than ‘London-purple’ and 
other compounds. The chief point to be guarded against is getting the 
liquid too strong.” 
These suggestions, coming from such an eminently well-qualified 
adviser, careful and experienced, as well as practically acquainted both 
with the subject itself, and also the extent to which the plan has been 
adopted both in Canada and the United States, are well worth 
consideration. “Paris-green” is chemically an aceto-arsenite of 
copper, and of a poisonous nature, and therefore should be used with 
care in mixing; and should not be applied to fruit, or to vegetables 
that are used for food, but, as will be seen in the following recipes, the 
quantity advised for orchard-use in the Canadian Government Eeport 
(quoted below) to check Looper-attack on leafage is very small. 
For liquid application, the amount recommended for spraying for 
Cocllin Moth or young “Looper” Caterpillar is not more than from 
2 to 4 ozs. in 40 (forty) gallons of water, or £ to | oz. in a pail of 
water (4 gallons, E. A. 0.), to be applied as a fine spray by means of a 
force-pump. The foliage must not be drenched, but the spray should 
only be allowed to fall upon the trees until it begins to drop from the 
leaves.” 
“ For general use on mature foliage .—% lb. of Paris-green, 50 gal¬ 
lons of water.” First mix the Paris-green separately with a small 
quantity of water, then add to it the whole supply. All washes 
containing Paris-green must be constantly stirred to keep it in 
suspension, or it will sink to the bottom.”* 
So far back as 1873,f Paris-green spray or wash was noticed as 
serviceable for destroying this class of caterpillars (as well as others), 
and I might almost say that the leading official entomologists of 
Canada and the States have thought me to blame in not bringing forward 
here what has been proved there to be of great service by trial of many 
years, and over an area of thousands of miles. Therefore I beg now to 
draw attention to the use of Paris-green as being an insecticide well 
worth careful trial; and as the different names under which this 
chemical is sold, and likewise its exact nature, are not generally known 
in this country, I give the following information, with which I was 
favoured on application to Messrs. Blundell & Spence, of Hull, as 
* ‘ Report of Entomologist and Botanist, Central Experimental Farm, Department 
of Agriculture, Canada, 1887, p. 21. 
t ‘Report of the Entomological Commission,’ published by U.S.A. Department 
of Agriculture, 1880—82, p. 192. 
