4 
Journal of Agricultural Research 
Vol. XXV, No. I 
Table II .—Percentage of parasitism of larvce of Ceratitis capitata in Hawaii in 1919 and 
1920 
Host fruit. 
Month. 
Number of 
larvae 
emerging 
during first 
2 to 6 days. 
Percentage of parasitism. 
Opius 
humilis. 
Diachasma 
tryoni. 
Diachasma 
fullawayi. 
T etrastichus 
giffar dianus. 
Total. 
1919 
1920 
1919 
1920 
1919 
1920 
1919 
1920 
1919 
1920 
1919 
1920 
Indian almond.. 
Jan... 
1,432 
309 
9.9 
12.6 
9.8 
19. 7 
1.4 
9.1 
21.1 
41 * 4 
Feb... 
3,657 
255 
28.2 
14* 9 
12.2 
• A 
3. 2 
4.7 
43* 6 
T 4 * T 
20- O 
Mar... 
197 
142 
36.5 
23-9 
13-7 
2. I 
2.0 
0.7 
4-1 
2.1 
56.3 
28.8 
Apr... 
122 
1,100 
18.9 
16.2 
13 * 1 
18.4 
5*6 
3*3 
3*4 
35*3 
43*6 
May... 
6,841 
26.7 
31.6 
• 4 
3.1 
61.8 
June.. 
423 
240 
2.6 
50.0 
26. 2 
23.8 
11.3 
2.9 
40. I 
76. 7 
July... 
7*283 
2, 77 i 
26- 2 
5-8 
32.1 
16.3 
15-0 
7*6 
8.1 
65*9 
45*3 
Aug... 
7,212 
4,406 
7-9 
9-5 
8.4 
13-4 
24.1 
14.9 
11.6 
31*2 
58.6 
Sept.. 
7,654 
6,169 
5-7 
5*2 
16.1 
29-3 
2.9 
19-4 
8.6 
21*5 
33*3 
75*4 
Oct... 
8,637 
3,993 
4.2 
2.4 
13-2 
56.4 
1.4 
6.7 
6.4 
6.0 
25*2 
7 i *5 
Nov... 
7,200 
729 
8.0 
2.9 
29.7 
49.1 
. 2 
16. 2 
8.2 
15*0 
46.1 
83.2 
Dec... 
4,503 
60 
13-3 
i -7 
43-6 
11. 7 
20. O 
8.9 
33*3 
65.8 
66.7 
Mango. 
Apr... 
222 
143 
2. 7 
2.1 
12. 2 
* 9 
15.8 
2.1 
May... 
572 
312 
4.0 
•7 
16.3 
7-1 
•9 
2*9 
4.0 
1.0 
25. 2 
11. 7 
June.. 
284 
461 
3-6 
2.6 
15.8 
12.6 
1.1 
6*3 
4.2 
i *5 
24.7 
23.0 
July... 
167 
. 
.6 
. 
9-6 
. 
1. 2 
. 
6.0 
17.4 
...... 
Strawberry 
Jan.. . 
33 
27.3 
12.1 
15. 2 
cx. 6 
guava. 
Feb... 
107 
19 * 5 
9.3 
2.8 
jh* u 
61.6 
Mar... 
12 
443 
16.6 
55-5 
.. 
5-2 
• ••••• 
3-1 
. 
1.6 
16.6 
65.4 
Apr... 
152 
48* 0 
. 7 
48* 7 
May.,. 
2,453 
509 
2.0 
I.-2 
53-4 
6-5 
1*5 
9.4 
2.1 
3*9 
59 *o 
21.0 
June.. 
2,140 
6.8 
. 
5 i -5 
1.8 
. 
3*8 
. 
63*9 
. 
July... 
i, 786 
7. I 
43 * 0 
17.5 
7. 2 
7 a. 8 
Aug 
146 
4 * 1 
51. 4 
15.8 
2.8 
74 . T 
Sept.. 
495 
3.2 
9.1 
66.3 
5*9 
i*t m * L 
8a. c 
Coffee. 
Jan... 
782 
984 
2. O 
34.5 
3* 6 
7.4 
35*3 
. 1 
A A* O 
38.9 
Feb... 
279 
2 * 2 
33 - 0 
30.5 
♦Hr* w 
6c. 7 
Mar... 
380 
.3 
21.8 
2- 6 
u j / 
24. 7 
Apr... 
9 
33-3 
22.2 
55 * 5 
May... 
10 
* 0 
July... 
155 
5.8 
26.5 
32*3 
Aug... 
124 
.8 
2.4 
91.9 
QC. I 
Black myrobalan 
Apr 
720 
.6 
• 4 
* I 
I* I 
Aug 
153 
3.3 
9.1 
2.6 
15*0 
Sept.. 
1,337 
4.4 
•4 
. 
i *3 
3*9 
10.0 
Oct... 
1,478 
73 
14.9 
. 
4.6 
4.1 
4.9 
"8." V 
5*8 
30.2 
12.3 
Nov... 
3*246 
313 
5-3 
3-9 
5 -i 
5 *o 
21.1 
9*3 
5*8 
23*5 
32.0 
Dec... 
3 ii 
328 
16.1 
1.0 
7 *o 
1.6 
23.2 
47.0 
15*9 
65*7 
46.1 
Peach 
Mar... 
89 
. 0 
3.4 
. 0 
39.3 
42. 7 
Apr.,. 
908 
59 
1.0 
13-6 
13-7 
i *7 
. 0 
. 0 
iS*6 
3*4 
30*3 
18. 7 
Satin leaf ... . 
Jan 
164 
28. 7 
3. 7 
4.9 
37*3 
Feb... 
3 2 
34 . 4 
Mar... 
US 
199 
67*0 
30.1 
. 
4.0 
4 . • • • ♦ 
34*3 
i *7 
1.0 
68.7 
69*3 
Rose apple. 
May 
1,933 
1.9 
20. 2 
1.3 
.3 
23. 7 
June 
8,627 
7.3 
24. 2 
13.0 
1*3 
45 * 8 
July 
841 
. 7 
54 * 8 
21.8 
5.6 
82.0 
Aug 
96 
21.9 
13*5 
5 * 2 
40.6 
French cherry... 
Tan... 
205 
2.9 
1.5 
♦ 5 
4.9 
Feb... 
501 
11.4 
2.8 
• 2 
1 .2 
ic. 6 
Mar... 
17 
52.9 
v 
52.9 
Apr... 
19 
1,142 
68.4 
26.6 
. 
•3 
. 
1.8 
. 2 
68.4 
28.9 
May... 
6 
236 
50.0 
28.8 
16. 7 
8*5 
5.1 
• <4 
66.7 
42.8 
June 
1,052 
1.8 
39 - 0 
34 * 1 
*T 
# I 
75 * ° 
July 
35 
2.9 
77.1 
2.9 
82.9 
Sept.. 
108 
12.0 
. 
34-3 
I4.8 
2.8 
63*9 
Oct. .. 
322 
. 
35-0 
. 
11.8 
. 
18.0 
. 
.6 
. 
65*4 
...... 
West Indian 
Mar 
92 
1.1 
1.1 
2. 2 
medlar. 
May 
17 
5.9 
CT. 0 
June 
29 
Raman i. 
Jan.. . 
312 
. 3 
♦ 3 
Dec... 
578 
• 3 
• 2 
• 5 
Yellow oleander. 
Jan... 
80 
2* 5 
1. 2 
10.0 
43 * 8 
57.5 
Feb... 
299 
3 * 0 
1.0 
13.4 
13.0 
30.4 
Mar 
153 
26.8 
39.9 
66.7 
Apr. .. 
7 
35 
11.4 
2.9 
57 *i 
71.4 
July... 
364 
. 5 
3 - 0 
20, 9 
7 * 7 
32.1 
Aug.. . 
101 
I. 0 
II- 9 
II- 9 
24*8 
Sept .. 
12 
Oct . 
2 C 
35 
A . O 
16. 0 
16. 0 
62.9 
8-0 
11.4 
64.0 
74*3 
Dec. .. 
22 
13*6 
22. 7 
9 * I 
A C • A 
Carambola . 
Sept.. 
6 
16.7 
16.7 
33*4 
