February, ’18] 
PETERSON: PEACH TREE BORER 
51 
nut brown color and possesses distinct hexagonal and variously shaped 
areas (y) on the surface. These areas are marked off by elevated light 
colored lines (r) and are most prominent toward the large end of the 
egg. 
A distinct larva (Fig. 3, 4) may be found in a U-shape position within 
the egg two or three days before hatching; the head and caudal por¬ 
tions located near the large end of the egg. When the larva is ready 
to emerge it breaks through the thin depressed area (d) at the large 
end of the egg. It punctures the shell with its mandibles and then 
continues to tear down the egg shell (e. s.) ventrad of the head until 
the opening (e) is large enough for it to crawl out (Fig. 3, 5 and 6), The 
bits or fragments (x) of the egg shell torn off by the mandibles of the 
larva are not consumed, but shoved to one side. 
The eggs of the peach borer require from 9 to 11 days to hatch, but 
in a few cases it took a day or two longer. From 90 to 100 per cent of 
the fertilized eggs hatched in the checks used in the various experiments 
while eggs deposited by unfertilized females never hatched. When eggs 
were deposited on sprayed branches, the spray never affected their 
hatching. 
A few experiments were conducted with the eggs. They were 
sprayed with various chemicals, principally common contact insecti¬ 
cides and the effect of these on the eggs is shown in Table III. Eggs 
which did not hatch usually collapsed as in Figure 3, 3 this was par¬ 
ticularly true of eggs killed by “Scalecide” (a miscible oil) and “ Fly- 
skat” (a creosote compound). All eggs were sprayed within five days 
after they were deposited. 
In the following experiments no material was sufficiently effective to 
consistently kill 100 per cent of the eggs or enough to make any one 
material worthy of being considered an infallible agent in killing 
peach borer eggs. “Scalecide,” a miscible oil, at varying strengths 
gave the best results, killing 40 per cent to 100 per cent of the eggs in 
the different trials (Experiments 1-6) and the stronger concentrations 
were the most effective. “Scalecide” combined with crude carbolic 
(Experiments 5 and 6) was given two trials. “Fly-skat,” 1-10 
(largely a creosote compound) was given several trials and the results 
vary somewhat. In Experiment 8 (no check) two eggs failed to hatch 
out of 47 while in Experiments 7 and 9 about 66 per cent of the eggs 
were killed. A few experiments were conducted with fish oil soap 
alone, fish oil soap and crude carbolic, and laundry soap and cresol, 
but these are not extensive enough to base any conclusions on them. 
Lime-sulphur, 1-9, was tried (Experiments 13 and 14) and 30 per cent 
were killed in experiment 13. Nicotine resinate was given a number 
of trials (Experiments 15 to 19) at varying strengths (1-100, 1-250, 
