26 



BULLETIN 847, U. S. DEPARTMENT OF AGRICULTURE. 



Table IX shows that in row 16, where the adult females were liber- 

 ated, the total number of borers for the three years was greater than 

 in an}' other row of the orchard. It shows also that a few rows on 

 each side of row 16 contained considerably more than the average 

 number of borers for the other rows of the orchard. 



In 1915 nine female and several male beetles were liberated on 

 row 29. A later examination showed that this had resulted in the 

 greatest number of borers occurring in row 29, the central rows of 

 the orchard having this year the fewest borers. 



The results shown in Table IX and the distribution of the borers 

 found in 1915, when the females were placed on row 29, are set forth 

 graphically in figure 4. 



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Fig. 4. — Baperda Candida. Diagram showing tendency of female beetle to refrain from 

 long flights during oviposition. A, Number and distribution of borers found in or- 

 chard after liberating 124 female beetles during three separate years on row 16. 

 B t Number and distribution of borers found after liberating 9 females on row 29. 



All the foregoing data on the flight of the female point to a con- 

 stant tendency on her part to deposit eggs near the place of her de- 

 velopment. They also afford good evidence that the female beetle 

 is capable of flights of considerable distance when impelled by any 

 special desire. 



In one case when a female was liberated in the manner described 

 above, she immediately took wing and arose to a height of 30 or 40 

 feet and then disappeared in the direction of a tract of woods about 



