48 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
Repellents 
When the female wishes to deposit her eggs she feels about the sur¬ 
face of the object on which she is located with the tip end of her ab¬ 
domen. With this observation in mind it was thought that certain 
chemicals might repel her or at least keep her from depositing eggs on 
sprayed surfaces such as sprayed peach branches. Table II gives the 
results of a number of experiments with various spray mixtures. In 
each experiment one fertilized female was placed in a small round wire- 
screen cage (6 inches in diameter and 9 inches high) and two peach 
branches in an upright position (1 inch in diameter and 8 inches long), 
one sprayed and the other serving as a check. Light did not influence 
the female in depositing eggs for the position of the branches was re¬ 
versed nearly every hour. 
Table II— Repellent Effect of Sprays dering Oviposition 
Expt. 
Spray 
Check 
Branch 
Sprayed 
Branch 
Cage 
Floor 
Total 
1 
“Scalecide,” 1-15 
129 
16 
3 
45 
192 
2 
“Scalecide,” 1-15 
37 
53 
141 
82 
313 
3 
“Scalecide,” 1-15 
76 
84 
40 
105 
305 
4 
“Scalecide,” 1-15 \ 
Carbolic, 1-99 / 
211 
42 
44 
24 
321 
5 
Lime-sulphur, 1-9 
163 
86 
196 
7 
452 
6 
Lime-sulphur, 1-9 
80 
6 
130 
96 
372 
7 
Lime-sulphur, 1-9 
25 
8 
0 
0 
33 
8 
Lime-sulphur, 1-9 
103 
53 
72 
6 
234 
9 
Nicotine resinate, 1-100 
93 
66 
20 
0 
179 
10 
Fish oil soap, 1-16 
313 
27 
118 
53 
511 
11 
Fish oil soap, 1-16 
133 
15 
48 
127 
323 
12 
Fish oil soap, 1-32 
154 
30 
14 
20 
218 
*13 
Fish oil soap, 1-100 \ 
Carbolic acid, 1-99 / 
20 
18 
0 
11 
49 
14 
Fish oil soap, 1-100 1 
Carbolic acid, 1-99 J 
24 
31 
17 
3 
75 
15 
“Fly-skat,” 1-10 
212 
16 
41 
3 
272 
16 
“Fly-skat,” 1-10 
160 
25 
174 
133 
492 
17 
“Fly-skat,” 1-10 
64 
75 
72 
28 
239 
|18 
“Fly-skat,” 1-10 
7 
13 
3 
29 
52 
* Fly-skat is chiefly a creosote compound, 
f Fertility of female questioned. 
» 
The results of the experiments recorded in Table II are not as definite 
as might be wished for; however, they do show the partial repellent 
effect of certain mixtures on the female during oviposition (Experi¬ 
ments 1, 4, 5, 10, and 15). 
On August 21, one large experiment was set up in the large cage 
(8' x 8' x 6') to determine the response of the female to various spray 
mixtures and this experiment ran continuously until September 21. 
Thirty-two peach branches, one to two inches in diameter and eight¬ 
een inches long, were cut on August 21 and sprayed; six with “Scale¬ 
cide” (a miscible oil), 1-15 (Sc), four with “Fly Skat” (a creosote com¬ 
pound), 1-10 (Sk), six with lime-sulphur, 1-9 (LS), six with fish oil 
soap, 1 gr.-32 cc. (F), and ten checks (Ch) or unsprayed branches. 
