THE CALIFORNIA PEACH BORER. 81 
Numerous records of oviposition by moths which were confined in 
cages indicate that the favorite place is on the lower surface of the 
leaves (Table VI). 
TaBLeE VI.—Oviposition of moths of the California peach borer within the rearing cages. 
| | 
ree a On On | 
a = placed on n upper 
Cage No. wood of branches. | surface Rehan | Total 
cage. of leaves. a 
‘ | 
‘i ow, oe a Bel aie ae ae Ee ee a 55 16 14 19 | 204 
Bot oe DOE ee Sk ie ee | 66 49 53 168 
meine eee meee eee Stn sy aye Sohn cash ee 272 474 746 
Ds os dee ek ID OA LOLS eed SR Met eae 20 144 40 204 
Byam Sa OE Sees AD le ae ee a oe anne a ee isan ciao 2 Sl a ee ie a 48 220 268 
(Rac oe nc os LW 6 RR aR gel a ca | 55 (Raalfeaeenee Se 102 293 
THIS Ee eee een See 110 168 527 1, 008 | 1,813 
Moths flying in the open field always place their eggs on the lower 
trunk a few inches above the surface of the ground. The eggs are 
arranged in groups as in the rearing cages. <A careful examination of 
branches and leaves of several trees in a badly infested orchard 
showed no eggs elsewhere than on the lower trunk, but many groups 
of eggs were found on individual trees. A moth was once observed to 
fly and alight on the trunk of an apricot tree about 5 inches from the 
ground. She soon moved 2 or 3 inches higher and remained there 
about two minutes, placing about 12 eggs; she then flew rapidly away 
until she was lost to sight. Thirty other eggs which had been placed 
at some previous time were also observed near this group. All were 
within a radius of 2 inches and were grouped in numbers of from 3 to 
10. They were not definitely arranged. Clusters of eggs can be found 
easily on the lower trunks of trees in any badly infested orchard. 
The eggs on a single five-year-old apricot tree in the open field 
(Kelly orchard) were numbered and grouped as follows: 2, 3, 3, 6, 8, 
8, 9, 10, 27, and there were about a dozen scattered, singly-placed 
eggs. All were between 1 and 2 inches above the surface of the ground. 
On a second tree 44 eggs, all near the surface, were grouped as fol- 
lows: 1, 1, 1, 2, 2, 2, 2, 4, 6, 8, 13. All the eggs on both these trees 
were hatched when examined (Aug. 10, 1908). 
Records of oviposition by individual moths may be listed as fol- 
lows: 294, 275, 205 (6+199 dissected), and 412. Eight unmated 
females which were placed in confinement oviposited as follows: 5, 6, 
11, 11, 25, 48, 50, 83, and in each ease the moth died before the second 
day. 
Table VII, which is a record of oviposition by individual moths, 
indicates how soon oviposition begins after mating, how long it con- 
tinues, the number of eggs placed, and the life of the moth. All 
moths were introduced into the individual cages immediately after 
they were taken from the trap cages in the field. 
