The Currant Fruit Fly. 



225 



the mixture was sifted, and six perfectly formed puparia and 

 three shriveled and discolored puparia were found. 



Three experiments were performed to ascertain the effect 

 of lime on the larvae in gooseberries. The details are given in 

 table 23. 



TABLE 23. 



Effect of Lime on Larvae. 



Quantity of 



infested 

 gooseberrleB 



Quantity of lime to two square 

 feet of soil 



Number 



larvae 



pupated 



Number 



of dead 



pupae 



1 qt. 

 1 qt. 

 1 qt. 



5 lb. imslaked, stirred in soil 

 15 lb. unslaked, on berries 

 10 lb. slaked, on berries 



22 

 76 

 61 



7 

 13 



20 



A number of preliminary experiments were performed with 

 other chemicals placed on or in ground to ascertain their effect 

 on pupae buried three inches below the surface of clay soil and 

 possibly on the adults upon emerging. The area of land treated 

 varied from one and one-half to two or three square feet. Imme- 

 diately after the application of the chemical, cages with top of 

 screen wire and board sides, were placed over the areas treated. 

 Earth was banked and tamped around the bottom of each cage 

 to prevent the escape of any of the flies. Some of the pupae 

 were probably not killed by the chemicals, but the flies undoubt- 

 edly were not able to burrow completely through the clay soil, 

 for this had become hard and compact and the surface was baked 

 into a hard crust. It was impossible to make a daily visit to 

 these cages, and the records in table 24, of the number of flies 

 which emerged are not complete, for the wings of dead flies 

 devoured by Carabids and ants were found under the cages. 



