February, ’18] 
PETERSON: PEACH TREE BORER 
49 
These branches were placed under a wooden frame (36" x 18" x 18") 
covered with white mosquito netting and were arranged according to 
the following diagram. The branches on the outside rows and those 
at the ends stood upright while those on the inner row were tilted (45° 
angle) toward the middle and the opposite branches tied together at their 
tip ends. The letters in the diagram indicate the material used in 
treating and the number adjacent to the letters indicates the numbers of 
eggs on the respective branches. Ten tin cans (T.C.) were filled with 
moist sand and each possessed from 8-12 living pupse in cases. These 
were placed in the center. This experiment ran for thirty days and in 
this period some sixty adults emerged and over 6,000 eggs were de¬ 
posited by the females. The distribution of the eggs can be seen in 
the diagram and the average per branch in the table accompany the 
diagram. 
Diagram Showing Arrangement op Sprayed and Unsprayed Branches and the Number of Eggs Depos¬ 
ited on the Respective Branches. The Top Margin op the Experiment Faced the North 
Ch 
F 
IS 
Ch 
IS 
F 
Ch 
525 
76 
2$3 
101 234 
116 M2 
51 
m 9i 
S5F 31 
M0 
s¥ 
“BE 
Sc 
be 
CTT 
SI 
Sc/266 
T.O. 
T.C. 
^.C. 
T.C. 
T.C. 
180 /Sc 
LS/175 
T.C. 
170/LS 
T.C. 
T.C. 
T.C. 
T.C. 
111/Sc 
Sc/255 
Ch 
Sk 
P 
P 
Ch 
Sk 
686 
TS 
108 
TM 72 
W 176 
Tf& 
95 1X8 
126 M 
261 
sir 
T” 
IS 
BE" 
IS 
F 
“BE 
Average Number op Eggs per Branch Receiving Similar Treatment 
Spray 
Average Number of Eggs on Branches 
Upright 
Tilted 
Total Av. 
Ch,—Check branches. 
421 
116 
300 
F,—Fish oil soap . 
170 
129 
156 
LS,—Lime sulphur. 
154 
154 
Sc—“Scalecide”. 
195 
84 
158 
Sk,—“Fly-skat”. 
41 
41 
(Creosote) 
The above experiment and the experiments with individual females 
(Table II) show the partial repellent effect of certain materials on the 
female when ovipositing. In a number of cases the repellent served 
to cut down the number of eggs 50 per cent and in some instances the 
reduction was below this, but no material completely repelled the 
female. How females would respond to these mixtures in the orchard 
has not been determined, but so far as we know they would behave in a 
similar manner. Since the above sprays will not repel the female in 
captivity, it is inadvisable to make use of these materials in the or¬ 
chard with the purpose of repelling the female. 
5 
4 
