October, ’20] 
HERRICK: APPLE MAGGOT 
387 
described in the following words by Mr. Ogden, “To my great delight 
I find almost no maggot. A little in the Spies but almost none —last 
year I could not get two barrels of good Spies out of 75.” 
Last year the Baldwins and Duchess in these orchards were badly 
infested. This year these varieties were practically free from infesta¬ 
tion. In answer to my question, “Did the two applications of poison 
that you made control the apple maggot satisfactorily?” Mr. Ogden 
replied in the following words: “Absolutely. I doubt if we could do 
a better job. I have nearly 2,000 barrels this year and a very high 
per cent of A grade. I am satisfied by following same method we can 
control.” 
The results in these two carefully sprayed orchards were obtained in 
face of the fact that the maggot was more or less abundant in the whole 
of the western border of Columbia County and caused general loss to 
nearly all of the growers as Rundlett determined by his careful survey. 
Situated near Mr. Van Alstyne’s place is a large dairy farm having 
a small orchard on it of mixed varieties. It appears that all of the 
varieties in this orchard have been badly infested with the maggot for 
some years and we were anxious to have it sprayed as a matter of pro¬ 
tection. We were able to induce the dairy foreman to give this or¬ 
chard two sprayings at about the same time as the other orchards were 
sprayed although I do not have the exact dates. This orchard was 
sprayed with lime-sulfur and arsenate of lead each time. So far as 
we could judge in talking with the foreman the spraying had not been 
done with any great care or thoroughness and with little interest in the 
matter. The owner was ill and unable to look after any outside mat¬ 
ters and the foreman is a dairyman. The results were not satisfactory 
to the entomologist although the foreman was very enthusiastic be¬ 
cause the apples were so much freer of the maggot than they had been 
in previous years. As a matter of fact, there was considerable infesta¬ 
tion in nearly all of the varieties we examined and a goodly percentage 
of drops. Either the addition of the lime-sulfur or the careless spray¬ 
ing or a combination of both factors prevented the success obtained in 
the other orchards where the prime object was to destroy the maggot. 
Caesar and Spencer 1 have obtained experimental evidence which 
indicates that the cherry-maggot flies are not destroyed as effectively 
by a mixture of lime-sulfur and arsenate of lead as they are by arse¬ 
nate of lead alone in water or by a combination of arsenate of lead, 
molasses, and water. 
The results of these cooperative field experiments, it seems to me, 
show that rather more thorough spraying than I formerly deemed im- 
1 Caesar, L., and Spencer, G. J., Cherry fruit-flies, Dept. Agr., Ont. Can., Bui. 227, 
pp. 22 and 28, 1915. 
