IO 
BULLETIN 98. 
extensively* about Greeley and many who used them seem well 
j j , J 
pleased with the results obtained. 
PREPARATION OF THE POISONS. 
IN WATER. 
Paris green or London purple .—Mix one pound of the poison 
in 50 gallons of water and make a thorough and even application. 
Arsenate of lead. —Mix 5 or 6 pounds of the poison in 100 
gallons of water and apply thoroughly. 
Arsenite of lime. —Boil together white arsenic, lime and 
water for a full half hour in the following proportions: 
White arsenic.1 pound 
Lump lime.2 pounds 
Water...3 gallons 
Then dilute to 100 gallons with water and apply. 
Or prepare as follows: Dissolve one pound of white arsenic 
and 4 pounds of sal-soda by boiling them together for 15 minutes 
in a gallon of water. LTse two quarts of this stock solution to 50 
gallons of water and before using stir into it 8 pounds of freshly 
slaked lime of best quality. Spray thoroughly as with the other 
poisons. 
DRY APPLICATIONS. 
About Greeley the past summer the growers used the Paris 
green dry without any dilution and they applied from 1 f to 3 
pounds to the acre. Mr. Timothy, agricultural superintendent of 
the Greeley Sugar Company, said they had found the dry applica¬ 
tions very satisfactory. 
Whatever the application, it must be made promptly upon 
the first appearance of the worms, the poison must be evenly dis¬ 
tributed, and the treatment must be thorough, to secure good 
results. 
NATURAL ENEMIES. 
Insect-eating birds devour the worms in large quantities. 
Where the worms were abundant last August the blackbirds were 
attracted in flocks of thousands and in several instances that came 
under our observation the worms were all cleaned out of fields by 
them in the course of two or three days. 
Another check which nature has provided to keep this insect 
from becoming too numerous is a parasitic flv with dusky wings 
shown in Plate I, Fig. 8, and known to science as Cremops vul¬ 
garis A The large numbers of the worms last year was probably 
due more to the small numbers of this parasite than to anything 
i Determined for me by Mr. E. 8. G. Titus. 
