October, ’24] 
HERBERT: SPRAY STIMULATION 
567 
obtained with less material per acre. Improvements in methods of 
application are also under way, as well as experiments to ascertain the 
proper depth of application, distance between treated rows, best time to 
apply the cyanide, etc. 
The calcium cyanide used in the field experiments was the granular 
form, which is the ordinary flakes ground to about the fineness of coarse¬ 
ly ground coffee and the finer particles sifted out and discarded. This 
material feeds readily from grain and small seed drills, is more convenient¬ 
ly handled and applied and appears to give better results than the finely 
ground dust. 
CONTROL OF THE APPLE BLISTER MITE IN THE 
NORTHWEST 
By Leroy Childs, Hood River, Oregon 
(Withdrawn for publication elsewhere) 
CITRUS SPRAYING IN TULARE COUNTY 
By A. F. Kirkpatrick, Lindsay, California 
(Paper not received for publication.) 
NOTES ON AN OUTBREAK OF CUTWORMS 
By S. J. Snow, U. S. Bureau of Entomology, Salt Lake City, Utah 
(Paper not received.) 
The following papers were read by title: 
SPRAY STIMULATION 
By Frank B. Herbert, Assistant Entomologist, Balfour Guthrie & Co. 
Abstract 
Stimulation to deciduous fruit trees has been noted from a number of different 
sprays, but the greatest amount has occurred after using the heavy types of Miscible 
oils. 
Stimulation is due partly to the heavy oil base and partly to the emulsifiers in 
them. 
The condition of the tree and soil and time of spraying are factors in the amount 
of stimulation to be obtained from the oil spray. The spray must be applied between 
December 15th and February 1st to be certain of it. 
Although there may be some disadvantages, the advantages are many such as: 1. 
The early bloom makes the fruit set early, thereby coming ahead of the emergence of 
