THE GRAPE PHYLLOXERA IN CALIFORNIA. 
61 
Table XIII. — Incubation and development of radicicole of the grape phylloxera 
on living vines, Walnut Creek, Calif., 1913-1915 — Continued. 
SECOND GENERATION, 1913. 
Indi- 
vidual 
No. 
Date egg 
deposited. 
Date egg 
hatched. 
Incuba- 
tion 
period. 
Date 
insect 
matured. 
Growing 
period. 
Total 
period of 
develop- 
ment. 
Variety of vine and 
number of cage. 
Average 
temper- 
ature. 
1 
June 10 
June 11 
June 12 
...do.... 
June 30 
...do 
...do.... 
...do 
...do.... 
...do 
...do.... 
...do.... 
July 1 
...do.... 
...do.... 
June 30 
June 26 
...do.... 
...do 
...do.... 
...do 
...do 
...do 
June 27 
...do 
June 30 
...do.... 
...do 
...do.... 
July 1 
...do 
July 2 
...do 
June 20 
June 19 
...do.... 
June 20 
July 6 
July 8 
...do 
...do 
...do 
July 9 
...do 
...do 
...do.... 
...do 
...do.... 
...do 
July 3 
July 4 
...do 
...do.... 
...do.... 
July 5 
...do 
July 4 
July 5 
...do 
July 6 
July 7 
...do 
July 8 
...do 
...do.... 
July 10 
Days. 
10 
8 
7 
8 
6 
8 
8 
8 
8 
9 
9 
9 
8 
8 
8 
9 
7 
8 
8 
8 
8 
9 
9 
7 
8 
6 
6 
7 
7 
7 
7 
6 
8 
July 8 
...do 
...do.... 
July 11 
July 20 
July 22 
July 23 
...do.... 
July 31 
July 24 
July 25 
July 31 
Aug. 4 
Aug. 7 
Aug. 11 
Aug. 8 
July 21 
July 25 
July 26 
...do 
July 28 
July 29 
July 31 
July 28 
July 31 
Aug. 8 
Aug. 10 
Aug. 12 
...do.... 
...do.... 
Aug. 13 
Aug. 14 
Aug. 18 
Days. 
18 
19 
19 
21 
14 
14 
15 
15 
23 
15 
16 
22 
26 
29 
33 
30 
18 
21 
22 
22 
24 
24 
26 
24 
26 
23 
35 
36 
36 
35 
36 
37 
39 
Days. 
28 
27 
26 
29 
20 
22 
23 
23 
31 
24 
25 
31 
34 
37 
41 
39 
25 
29 
30 
29 
32 
33 
35 
31 
34 
29 
41 
43 
43 
42 
43 
43 
47 
Mission VII 
o F 
68 
2 
3 
4 
5 
do 
do 
do 
do 
•■ 
68 
68 
69 
70 
6 
7 
8 
9 
10 
11 
12 
13 
14 
U5 
16 
17 
do 
do 
do 
do 
do 
do 
do 
do 
do 
do 
do 
Burger VI 
70 
70 
70 
71 
70 
70 
71 
71 
71 
71 
71 
70 
18 
19 
20 
21 
22 
23 
124 
do 
do 
do 
do 
do 
do 
....do 
70 
70 
70 
70 
70 
70 
70 
25 
26 
do 
Burger V 
70 
71 
127 
128 
129 
130 
131 
132 
133 
do 
do 
do 
do 
do 
do 
do 
71 
71 
71 
71 
71 
71 
71 
THIRD GENERATION, 1913. 
1 
July 23 
July 31 
8 
Aug. 25 
25 
33 
2 
July 28 
Aug. 5 
8 
Aug. 28 
23 
31 
3 
July 29 
Aug. 7 
9 
Aug. 30 
23 
32 
4 
...do 
...do.... 
9 
Sept. 1 
25 
34 
5 
...do.... 
Aug. 8 
10 
Sept. 3 
26 
36 
Thompson'; 
Muscat IV . 
....do 
....do 
....do 
I.. 
FOURTH GENERATION, 1913-14. 
1 
Aug. 26 
Sept. 1 
!."."do7"." 
Sept. 3 
Sept. 8 
Sept. 9 
Sept. 10 
Sept. 23 
'Sept"24' 
'.'.'.do'.'.'.'.'. 
...do 
8 
7 
8 
9 
( 2 ) 
Sept. 18 
Sept. 22 
Sept. 30 
Apr. 6 
Apr. 9 
Oct. 24 
Apr. 6 
Apr. 7 
May 20 
Apr. 15 
Apr. 24 
Apr. 28 
Thompson's Seedless I. . 
3 71 
2 
10 
13 
20 
195 
198 
30 
194 
195 
238 
203 
211 
215 
17 
21 
29 
70 
3 
do 
69 
4 
5 
do 
Muscat IV 
69 
6 
7 
do 
do 
do.... 
do 
.do 
66 
8 
9 
10 
11 
12 
...do 
Sept. 25 
do 
do 
....do 
13 

1 
FIFTH GENERATION, 1914. 
1 
Apr. 25 
Apr. 26 
...do 
Apr. 27 
...do 
Apr. 28 
...do 
May 9 
...do 
...do 
...do 
...do 
...do 
...do 
14 
13 
13 
12 
12 
11 
11 
May 28 
...do 
June 2 
June 1 
June 2 
...do 
June 3 
19 
19 
24 
23 
24 
24 
25 
33 
32 
37 
35 
36 
35 
36 
Muscat IV 
62 
2 
3 
4 
5 
6 
7 
do 
do 
do 
do 
do 
do 
62 
63 
63 
63 
63 
63 
1 Indicates winged migrants. 2 Hibernant. a Indicates average temperature of incubation period alone. 
