THE CALIFORNIA PEACH BORER. 73 
TABLE Tit. —Records of larvx of the California peach borer taken from trees, 1908-9— 
Continued. 
Num- |} Num- 
Number roe ae per of per of toot mee Number 
of trees <ind o arvee | larvee | number umber | empty 
Date. exam- tree. small | half to of of pupze.| pupal Remarks. 
ined. to half} full larvee. cases. 
grown.| grown 
1909. 
Feb. 5 5 eae pr eee ee on |S ae eee 19 0 0 | Larvee of all sizes. 
Mar. 4 AO eed Obelem on] -eaacact es eeeeee 87 0 0 Do. 
ME VaReONlas. Sossq s[hoendss sales Soa Cee lal eee 428 1 EM Re As ee Larvee in cocoon; sec- 
ond for the season. 
20 9] Peach..... 0 9 9 Dae. = fede de Old peach trees only 
slightly attacked; all 
larve in cocoon; 
third for season. 
21 1 | Apricot 0 12 12 0 0} All larve nearly full 
grown. 
June 4] Several | Peach..... 0 20 20 7 0 
6 2 Apricot. 0 33 33 0 | Still active larva in 
just finished cocoon. 
9 12\} Peach... .- 0 20 20 5 2) All pupz and empty 
pupal cases in nearly 
dead trees. 
10 1, 1)0] esos 0 Lees |S ae eee Pace 34 13 2) Larve all nearly full 
grown; 10 pupz and 
‘ 2 empty cases from 
a nearly dead tree. 
24 7) Prune. 0 20 20 26 0 
26 10 uae 0 60 60 3 1 |’ Prune trees on almond 
or Myrobalan plum- 
root stocks, and 
mostly in good con- 
dition. 
26 NG |jado. 42....3.3 7 47 54 0 1 Do. 
26 te ees eae ee 0 76 76 53 | Several | Larve nearly all full 
grown; 40 pup, 13 
larve in cocoon, 
empty pupal cases 
in nearly dead trees. 
26 21 | Apricot... 0 87 87 48 36 | Trees about 8 years 
old, completely gir- 
dled; most larve in 
crown from surface 
of ground to 14 to 16 
inches above; 34 
pupe, 19 larve in 
cocoons. 
28 10" |5 S°GO5e tose Lees = 4 45 45 51 0 
July 7 DyleeeOOp ees: Several 20 20 30 16} The very few larve 
taken were appar- 
ently of the new 
brood. 
(AN See EA Ae eet 14 14 7A a ae Four larve removed 
from trees began to 
spin their cocoons 
July 30, 1909. 
The worming records, so far as they are related to the larval stages, 
‘may be summed up as follows: 
Newly hatched and very small larvee were found from early in June 
to October and November. Half-grown larve can be found at any 
time during the year. Larve which are fully grown during the 
summer usually transform to moths during late summer or fall, 
while larvee which are full grown during the fall and winter transform 
to moths early during the following spring. Larve more than half 
grown to full grown are most numerous during the winter and spring. 
Larve are apparently active throughout the winter and are never 
entirely dormant. 
