JOURNAL 
OF 
ECONOMIC ENTOMOLOGY 
OFFICIAL ORGAN AMERICAN ASSOCIATION OF ECONOMIC ENTOMOLOGISTS 
Vol. 13 
AUGUST, 1920 
No. 4 
Proceedings of the Thirty-Second Annual Meeting of the 
American Association of Economic Entomologists 
('Continued from p. 322) 
I A 
PAPERS READ BY TITLE 
-tf. 
/ 
DUST AND THE SPRAY GUN IN CALYX WORM CONTROL 1 
By Leroy Childs, Entomologist and Pathologist, Hood River Experiment Station, 
Hood River, Oregon 
Ever since the late Dr. A. J. Cook carried on some calyx worm con¬ 
trol experiments in Michigan a half century ago entomologists have 
argued one way or another relative to the way and in the amounts this 
poison becomes established in the calyx cups. The correct type of 
nozzle and the type of spray necessary to accomplish best results has 
been a much mooted question. In this connection some of our more 
enthusiastic colleagues have even gone so far as to believe that one well 
timed calyx application would be sufficient to handle the codling moth 
under ordinary seasons of infestation. 
Observations made by investigators in different parts of the country 
during recent years have pointed out that the percentage of calyx 
entrants is a very variable factor during different seasons in different 
sections. It has been the writer’s observation that during some 
seasons a very high percentage of the worms enter through the calyx 
and during others the reverse would be true. During the past season 
the worms entered in about equal proportions through the calyx and 
side on Spitzenbergs, while in Newtowns, side entrants occurred in a 
1 The manuscript was received too late for insertion at the proper place in the 
Proceedings.—E d. 
