October, ’20] 
PETERSON: ORIENTAL PEACH MOTH 
395 
Table I.— The Effect of Arsenical and Other Liquid Sprays on Larv,® of Various Sizes 
(5-9 mm.) When the Larvae Are Placed on Tender Growing Peach Tree Twigs 
which Are Thoroughly Coated with the Spray Mixture 
Experiment 
number 
Liquid sprays 
Larvae alive 
inside of 
twig 
Larval injury 
but no larvae 
seen 
Larvae dead 
Larvae alive 
outside of 
twig 
No larvae or 
injury seen 
Total larvae 
in trials 
1 
Lead arsenate, 2 lbs.-50 gals. 
6 
1 
0 
2 
4 
13 
2 
Lead arsenate, 2 lbs.-50 gals., plus 
casein-lime, 2 lbs.-50 gals. 
8 
0 
0 
1 
3 
12 
3 
Lead arsenate, 4 lbs.-50 gals. 
6 
0 
0 
0 
0 
6 
4 
Lead arsenate, 4 lbs.-50 gals., plus 
casein-lime, 2 lbs.-50 gals. 
4 
0 
0 
1 
2 
7 
5 
Calcium arsenate, 2 lbs.-50 gals. 
12 
1 
0 
0 
0 
13 
6 
Calcium arsenate, 2 lbs.-50 gals., 
plus casein-lime, 2 lbs.-50 gals. 
3 
1 
0 
0 
1 
5 
7 
Magnesium arsenate, 2 lbs.-50 gals. 
8 
0 
0 
1 
3 
12 
8 
Magnesium arsenate, 2 lbs.-50 gals., 
plus casein-lime, 2 lbs.-50 gals. 
5 
1 
0 
0 
0 
6 
9 
Zinc arsenite, 2 lbs.-50 gals. 
3 
1 
0 
1 
0 
5 
10 
Zinc arsenite, 2 lbs.-50 gals., plus 
casein-lime, 2 lbs.-50 gals. 
5 
0 
0 
0 
3 
8 
11 
Paris green, 2 lbs.-50 gals. 
6 
0 
0 
0 
2 
8 
12 
Paris green, 2 lbs.-50 gals., plus 
casein-lime, 2 lbs.-50 gals. 
3 
2 
0 
0 
1 
6 
13 
Hellebore, 1 gm.-lOO cc., plus f. o. 
soap, 1 gm.-lOO cc. 
3 
3 
0 
0 
1 
7 
14 
Nicotine, 1 cc.-500 cc., plus f. o. 
soap, 1 gm.-200 cc. 
2 
0 
0 
0 
5 
7 
15 
Nicotine resinate, 1 cc.-SOO cc. 
8 
0 
0 
0 
6 
14 
16 
Crude carbolic acid, 1 cc.-99 cc. 
plus f. o. soap, 1 gm.-200 cc. 
1 
0 
0 
2 
4 
7 
17 
Lime-sulfur, 1 cc.-40 cc. 
3 
0 
0 
0 
0 
3 
18 
“Scalecide,” 1-40 
5 
0 
0 
0 
0 
5 
19 
“Sulfolium,” 1-50 
3 
0 
0 
1 
4 
8 
20 
Check 
9 
0 
0 
0 
1 
10 
ing experiments with fruit show that the small larvae may be killed by 
a combination of lead arsenate and lime or lead arsenate and sulfur, 
but many of the larger larvae will not be killed. 
A series of experiments were conducted with fruit in place of tender 
peach twigs. The insecticides used were similar to those shown in 
Tables I and II. The results obtained (not shown in table form) 
were in many ways similar to those shown in Tables I to III. The 
various arsenicals applied as dusts to the fruit were superior to liquid 
sprays in killing the larvae, yet in no case was there a complete control. 
A few of the larvae were killed when the arsenicals were used in liquid 
2 
