THE MEDITERRANEAN FRUIT FLY. 
21 
duced. This has been appreciated and has caused a readjustment of 
prices paid for coffee "in the cherry" and has been responsible for 
the erection of many small pulping mills throughout the Kona coffee 
district. 
It seems reasonable to believe that the remarkable success of 
introduced parasites in checking the infestation of coffee will free the 
coffee grower from fur- 
ther worry so far as the 
Mediterranean fruit fly 
is concerned. 
CITRUS FRUITS. 
While all citrus fruits 
are favorite hosts of the 
Mediterranean fruit fly, 
certain of them are 
found to contain larvse 
more often than others. 
No citrus fruits are too 
acid for fruit-fly devel- 
opment. Larvse have 
been reared from the 
sourest lemons. Adult 
flies are fond of laying 
eggs in large numbers 
in all citrus fruits. Thus 
13 punctures in one 
grapefruit contained 
76, 153, 32, 25, 18, 8, 
46, 113, and 9 eggs, re- 
spectively. Thirty-nine 
oranges, either yellow 
or orange in color, con- 
tained an average of 32 
egg punctures, with a 
maximum of 108 and a minimum of 7 punctures. In 50 ripe lemons 
1,422 eggs were laid in 185 punctures. Yet no adult flies developed 
from this grapefruit or from the oranges and lemons. On the other 
hand, well ripened Chinese oranges (fig. 18), thin-skinned limes, kum- 
quats, and tangerines are so generally infested with larvae in the 
pulp before they become well ripened that they are always regarded 
with suspicion. 
Although many eggs are laid in lemons, it is rare that lemons 
are found with maggots in the pulp even when the fruits are so ripe 
Fig. 19.— Lemons of commercial varieties have never been found 
with larvae of the Mediterranean fruit fly destroying the pulp 
unless they have had the rind cut or broken previous to attack. 
The adult flies may puncture the skin and lay eggs, as indicated 
by the discolored spots, but the eggs and larvse die in the peel. 
(Original.) 
