2 
Journal of Agricultural Research 
Vol. XXV, No. I 
species and collectively, and the extent of infestation of different fruits by 
Ceratitis capitata. The present paper is a continuation of these records 
for the years 1919 and 1920. 
Tabi^B I. —Extent of infestation of host fruits by larva of Ceratitis capitata in Hawaii 
during 1919 and 1920 
Host fruit. 
Number of fruits 
collected. 
Number of C. capi¬ 
tata larvae emerging. 
Average num¬ 
ber of larvae 
per fruit. 
1919 
1920 
1919 
1920 
1919 
1920 
Indian almond (Terminalia ca- 
tappa) . 
Mango (Mangifera indica) . 
Coffee (Coffea arabica) . 
Strawberry guava (Psidium cat- 
tleianum) . 
Black myrobalan (Terminalia cke- 
bula ). 
Peach (Amygdalus persica) . 
Satin-leaf (Chrysophy Hum olivae - 
forme) . 
Rose-apple (Eugenia jambos) . 
French cherry (Eugenia uniflora ).. 
West Indian medlar (Mimusops 
elengi) . 
Kamani (Calophyllum inophyllum ). 
Y ello w oleander( T hevetia neriif0 lia). 
Carambola (Averrhoa carambola ).... 
Chinese orange (Citrus sp.). 
Guava (Psidium guajava) . 
Loquat (Eriobotrya japonica) . 
Noronhia emarginata . 
Orange (Citrus aurantium) . 
Waiawi (Psidium guajava pyriferum) 
Lime (Citrus medica limetta) . 
Tangerine (Citrus nobilis) . 
35.716 
1.595 
16,055 
2°, 539 
8, *99 
3 85 
229 
8,671 
453 
1. 479 
153 
21, 804 
6,675 
I, 690 
2l6 
34,066 
1,787 
4, 080 
3 °°, 39 1 
5 , 857 
6,985 
22,133 
25,266 
3 , 373 
10 
38,359 
5,226 
801 
4,225 
5 , 725 
1,136 
7,643 
2, 287 
438 
2,367 
106 
40, 260 
4, 051 
2, 682 
2, 462 
7 
53,870 
65,732 
5,827 
194 
611 
947 
154 
869 
710 
187, 811 
6, 212 
2,441 
8-4 
3 - 7 
•4 
25, 662 
1. 2 
23, 199 
156 
4 - 7 
13. 6 
3 , 748 
49 , 329 
8, 046 
5 -° 
•9 
834 
2, 147 
4 , 590 
22 
94 , 614 
29, 168 
6. 0 
i- 7 
•05 
2. 5 
9.8 
4 
28 
O 
3.649 
581 
182 
3-3 
768 
5-5 
3-5 
.6 
1. 2 
6.9 
15.6 
4-7 
ii -5 
1.4 
•4 
4. 9 
i -9 
. 2 
2.4 
7.2 
6. o 
.6 
1. 2 
•9 
Table I gives data which show the average infestation per fruit of 21 
different varieties collected about Honolulu in 1919 and 1920 and indi¬ 
cates in a general way the abundance of adults of Ceratitis capitata for 
those years. A comparison of this table with Table I in the records of 
parasitism for 1918, 3 would indicate a reduction of this pest during the 
past three years. For the year 1919 the average infestation of 9 varieties 
of host fruits was less than during 1918, and greater in 5. For the year 
1920 it was less in 9 varieties, the same in 1, and greater in 6 than in 1918. 
It is encouraging to see that many of these reductions in infestation 
occurred in the most preferred hosts of the fly, notably the peach (Amyg¬ 
dalus persica) and Indian almond ( Terminalia catappa). The peach has 
always been the most heavily infested fruit in Hawaii, and the average 
infestation for 1919 was less than for any year since the introduction of 
parasites, and over 33 per cent less than in 1918. The Indian almond can 
be found in all sections of Honolulu and is much preferred as a breeding 
place by the fly. It bears prolifically, and its infested, fruits can be 
8 WlI^ARD, H. F. OP. CIT. 
