DISPOSAL BY BURIAL OF FRUIT-FLY INFESTED FRUIT 15 



was found as high as 11 inches above the fruit. Most of the puparia 

 were in the soil surrounding the fruit; one was 6 inches above the fruit; 

 the rest were within 4 inches above the fruit. One adult was found 9 

 inches above the level of the fruit, but most of the adults were within 

 the first 4 inches. 



When moistened the sand becomes so compact and hard that it is 

 inconceivable that flies could pass through it. 



The data indicate that no flies will emerge from infested fruit if 

 it is covered with 18 inches of well-packed, preferably moistened, 

 sand when it is as fine as that used in this experiment. 



Although mangoes were used in these experiments, it is believed 

 that these results will also hold for citrus fruits. 



The conclusions derived from an experiment to determine the effect 

 of packing the surface of sand and soil in pits 18 inches deep are given. 



