30 BULLETIN 536, U. S. DEPARTMENT OF AGRICULTURE. 



Table VIII. — Infestation of citrus by the Mediterranean fruit fly — Continued. 









Eggs, appear- 



Larvae. 



Fruit. 





ance. 



Alive. 



Dead. 





Empty. 



Not 

 empty. 



Nor- 

 mal. 



Abnor- 

 mal. 



In 

 punc- 

 ture. 



In rag. 



In 

 pulp. 



In 

 punc- 

 ture. 



In rag. 



In 

 pulp. 



Sweet orange — Con. 

 17 





 2 

 6 

 5 

 7 



15 

 8 



29 

 4 

 3 

 4 



10 



8 

 11 



4 



5 



20 

 18 



9 

 16 

 13 

 10 



9 

 12 





! 







• 



45 

 79 

 25 

 10 

 63 

 51 

 29 

 37 

 65 

 13 

 6 

 37 

 40 





18 





1 









19 . 











3 

 19 

 107. 

 66 



7 



18 

 48' 

 35 

 27 





20 



3 



7 



12 

 14 



40 

 25 

 13 



150 



11 







19 



30 



12 



75 



4 



7 







10 



12 



36 







10 







9 



25 

 24 

 33 

 68 

 21 

 21 

 30 

 52 

 17 

 36 







' 12 





21. . 









22. 











23 









24 









25. . 









26 



! 







27 . ...... 









2S 









29 







52 





30 



12 



5 



2 

 3 

 2 





 3 

 2 

 1 



1 

 4 

 1 

 1 

 1 

 2 

 



11 



5 

 6 

 8 

 8 

 8 

 10 

 8 

 7 

 7 

 9 

 27 

 12 

 ^ 5 

 2 

 2 









Sour orange: 2 



1 



15 

 94 

 15 

 32 

 10 



250 



45 



57 



4 



48 

 48 



116 

 25 

 14 

 9 



9 







1 





2 





31 

 6 





3 











4 





11 







5 



1 



37 

 32 

 24 

 16 

 23 

 43 

 51 

 36 

 16 







6 



1 





14 



7 













8 







59 



7 





9 



18 





10 





10 





11 







28 







12 











13 









7 





14 







25 

 36 



49 



1 



15 













16 3 













17 



7 

 2 

 4 

 1 





 1 

 4 

 2 

















18 



5 



57 





















19 



12 

 44 















20 



2 





























1 Third-instar larvae in pulp beneath soft but undecayed spot in rind. 



- Fruit of sour oranges, 1 to 16 picked Mar. 3, examined Mar. 10 and 11, 1914; 17 to 20 picked Sept. 4, exam- 

 ined Sept. 5, 1913. 

 3 Very badly decayed. 



17-21. Citrus Fruits Easily Infested in Hawaii. 



The varieties of Citrus japonica in Hawaii known as the Chinese orange and the 

 kumquats ("testa di turco" of the Italians), of Citrus nobilis, known as the mandarin 

 and tangerine, and of Citrus medica limetta, or lime, are easily infested by C. capitata. 

 The data of Table VIII on the infestation of Chinese oranges and Hawaiian limes are 

 introduced as examples of infestation for the varieties of C. japonica and C. nobilis. The 

 rind of the Chinese orange and of many limes, mandarins and tangerines is so thin 

 that the adult fly is able to deposit eggs either directly within the pulp or between the 

 rind and the skin covering the pulp, but parallel with the rind and at a slight distance 

 away from the ruptured oil cells where they more often escape the fatal action of the 

 oil or hindrances in the form of a dense rag. Of 609 eggs deposited between the rind 

 and the pulp in Chinese oranges, 98.5 per cent hatched and the larvce, unhindered by 

 the presence of an impervious rag, entered the pulp. The infestation of the pulp of 

 limes, tangerines and mandarins is in inverse proportion to the thickness of the rind . It 

 is interesting to note that eggs in the Kusaie limes, the rind of which is sufficiently thick 

 so that the eggs are usually deposited directly beneath the puncture, die with great 

 regularity, while the eggs in Hawaiian limes, the rind of which may be sufficiently 

 thin to permit the eggs being deposited as in Chinese oranges, or so thick (according to 



