46 



BULLETIN 536, U. S. DEPARTMENT OF AGRICULTURE. 



That it may be appreciated that, contrary to the belief of many, the wild guavas 

 in the mountains back of Honolulu are a continual source of adult flies, particularly 

 in midwinter, the following records were made: 



21 fruits picked on and near the top of Round Top, Tantalus, 1,100 feet eleva- 



tion, December 19, 1913, yielded 63 adults. 

 24 fruits from Pauoa Flats, 1,100 feet elevation, December 22, 1913, yielded 



69 adults. 

 42 fruits from rim of Palolo Crater during December, 1913, yielded 362 adults. 



22 fruits from top of east ridge, Manoa Valley, 1,000 feet elevation, yielded 100 



adults. 

 50 fruits from head of Palolo Valley, 1,000 feet elevation, on January 2, 1914, 

 yielded 84 adults. 



59. Peach (Prunus persica). 



The peach (Prunus persica) is the most preferred of all host fruits grown in Hawaii 

 and in other countries (fig. 3). While excellent peaches have been grown in the 

 islands, at the present time scarcely a peach matures on the lower levels, and usually 

 the fruits are utterly destroyed before they are more than half to three-fourths grown. 



From 128 fruits, about three-fourths 

 grown, picked from the ground during 

 April, 1913, 2,929 adults, or an average of 

 about 23 adults per fruit, were reared. 

 From 10 of these fruits 34, 12, 25, 8, 49, 

 78, 64, 17, 6, and 54 adults, respectively, 

 were reared. As many as 90 larvae have 

 been taken from a single fruit. 



The writers have on rile data secured 

 during experimental work on the infesta- 

 tions of several thousand individual 

 fruits, but they throw no additional light 

 on the severity of peach infestation. 



60-62. Nectarine (Prunus persica var. 

 nectarina), Apricot (Prunus armeni- 

 aca), and Plum (Prunus spp.). 



Fig. 3. — Cross section of peach, showing the gen- 

 eral shriveling of the walls of the egg cavity and 

 the separation of the eggs. Drawing made 1| 

 days after oviposition. (Authors' illustration.) 



Varieties of Prunus spp. known as 

 plums, apricots (fig. 4), and nectarines are 

 reported well infested where grown in infested regions. These fruits are imported 

 in season to Hawaii from California and have been easily infested under forced 

 laboratory conditions. It seems probable that they will serve best as hosts when 

 partially grown, as the excessive moisture content of the well-ripened fruits, par- 

 ticularly of such varieties as the Japanese plums, causes a high mortality among 

 young larvae. 



63. Pomegranate (Punica granatum) . 



The writers have never reared C. capitata from pomegranate. Mr. O. H. Swezey, 

 of Honolulu, reared an adult identified by the senior writer as C. capitata from a fruit 

 partially decayed. The writers have examined many perfect and split fruits with- 

 out detecting evidences of infestation. Compere records finding infested fruits in 

 Asia Minor, and Trabut in 1901 reports infestation in Algeria. 



64. Apple (Pyrus spp.). 



Only a few apple trees (Pyrus malus) are found growing in those regions of Hawaii 

 sufficiently warm for C. capitata, hence the writers can offer no observations on the 

 infestation of this fruit occurring in the field. Apples have been found infested in 



