October, ’20] 
HERRICK: APPLE MAGGOT 
385 
apple maggot with a view to its control by the sweetened poisoned 
baits which had been so successfully used for the control of the Med¬ 
iterranean Fruit-fly in South Africa a few years previously. I pointed 
out that the insect had never been adequately controlled in this coun¬ 
try and that if the poisoned baits proved effective here it would be a 
great boon to growers. The results of his work are found in Bulletin 
324 of the Cornell University Experiment Station. 
Illingworth’s demonstration that the insect could be effectively 
controlled by the use of poisoned baits, sweetened or unsweetened, 
has now been substantiated by experimental evidence on a consider¬ 
able scale, notably in Canada, and by the spraying practices of many 
practical fruit-growers. It is the purpose of this paper to add to these 
accumulating proofs of Illingworth’s thesis the corroborative results 
obtained from some field orchard experiments made in New York 
during the season of 1919. In this connection I wish to acknowledge 
the invaluable aid of Mr. E. A. Rundlett, assistant Farm Bureau agent 
of Columbia County. 
The apple maggot is abundant and destructive in the Hudson River 
Valley; and in Columbia County, according to a rather extensive and 
careful survey by Rundlett, it constitutes one of the two or three 
major apple pests. It has been particularly injurious to the Maiden 
Blush, Alexander, Greening, Baldwin, Duchess, and Northern Spy in 
the orchards of Mr. James Van Alstyne and Mr. A. T. Ogden near 
Kinderhook, N. Y. In the orchards of Mr. Van Alstyne, for the past 
four years, the Alexanders have been so seriously infested that few 
have been fit for shipping. All of them during the season of 1918 were 
seconds and a large part of them dropped and were worthless. The 
Maiden Blush apples have also dropped badly and in 1918, especially, 
were nearly worthless. The Baldwins and Greenings have been 
badly infested with the maggot and many of them reduced to seconds 
while a goodly percentage have been rendered worthless for market 
purposes. 
In the orchard of Mr. Ogden last year (1918) seventy odd barrels of 
Northern Spies were produced on his trees of which only three-fourths 
of a barrel were of first quality. The others were so badly infested 
that they were either put in as seconds or not marketed at all. The 
crop was considered a failure. Nearly all of his other varieties were 
infested, especially the Baldwins and Duchess. 
During the last days of June the writer, in company with Mr. 
Rundlett, visited the orchards named and arranged for the applica¬ 
tion of the poison sprays. Mr. Van Alstyne applied the first spray, 
6 pounds of arsenate of lead to 100 gallons of water, on July 3. The 
second application was made on July 17 and 18, practically two weeks 
