. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 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. s'& CITRUS FRUITS. While all citrus fruits a
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 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. s'& CITRUS FRUITS. While all citrus fruits are favorite hosts of the Mediterranean fruit fly, certain of them are found to contain larvae more often than others. No citrus fruits are too acid for fruit-fly devel- opment. Larvae 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 larvEe 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.). Pl
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