314 



Journal, of Agricultural Research 



Vul. ni. No. 4 



slowly and ofifer themselves for attack over a considerable length of time. 

 Female fruit flies have been seen in Honolulu ovipositing in certain 

 grapefruits and oranges over a period of two or three months. It is not 

 therefore contradictory to the statement that citrous fruits are not the 

 preferred hosts of the fly that we find so large a number of punctures 

 recorded in Table I. 



Table II. — Host-fruit preference of the Mediterranean fruit Jly 



Experi 

 ment 

 No. 



/Orange, ripe but Rveen in color.. 

 \Mango, partially ripe 



/Grange, partially ripe.. 

 \Mango, partially ripe. . 



f Orange, partially ripe.. 

 \Mango, partially ripe. . 



fOrausxe, ripe. 

 \Maugo, ripe. . 



Combinatiou and conflition of fruits. 



(Orange, ripe. 

 \Wango. ripe. . 



! Lemon, green in color 

 Mango, partially ripe 

 Ball kamani. partially ripe. 



Lemon, ripe 



Mango, ripe 



3aU kamani, ripe.. 



[Lemon, partially ripe 



^Maugo, partially ripe 



iBall kamani, partially ripe. 



[Mango, nearly ripe 



\Ban kamani. ripe but sound 



iLemou, begirmiug to turn color. 



Orange, ripe 



.Mango, partially ripe 



■JBall kamani, partially ripe ■._. . . . 



IRose-appIe (Caryophyllus jambos) nearly ripe. 



[Orange, ripe 



{Rose-apple, ripe. 

 Mango, ripe 



i Lemon, beginning to turn yellow. 

 Mango, partially ripe 

 Ball kamani, mature but solid 



Number 

 of punc- 

 tures. 



Number 

 of eggs. 



105 

 I3S 



33 



84 



ss 



ri4 



54 

 376 



243 

 24 



HABITS OF MEDITERRANEAN FRUIT FLY 

 For those unfamiUar with the Mediterranean fruit fly it may be briefly 

 stated that this pest belongs to the order Diptera and the family Trypetidae. 

 It is one of many species of this family that cause much injury by their 

 attack upon various fruits. In the Plawaiian Islands the fly attacks over 

 30 different species of fruits and has. caused great financial loss. The 

 adult female, which is about the size of the ordinary house fly, pierces the 

 skin of the host fruit and forms an egg cavity beneath, in which she 

 deposits eggs. The larvse which hatch from these eggs either burrow at 

 once to the center of the fruit, as in the peach {Amygdaliis persica), or 

 may feed in the outer portion, as in the star-apple (Chrysophyllum 



