THE CANADIAN ENTOMOLOGIST 



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abolishing spraying and thus warding ocf the danger from fungi; 



(2) reducing the cost of labor; (3) overcoming the 

 unfavourable action of rains which wash off the 

 sweet ingredients of the spray and (4) doing 

 away with the inconvenience of lack of watfr in 

 certain regions. In southern Italy the fruit fly 

 remedy offers a serious difficulty on account of 

 lack of water to dilute the stock solution, but 

 with the dry method of control very little water 

 is used. 



One system used in France in 1908 and 

 classed under the dry method of controlling the 

 olive fly was to place the poisoned bait in a 

 bottle provided with a cork through which 

 passed a wick. This wick extended into the 

 poisonous mixture and acted like the wick of a 

 lamp. The molasses was slightly diluted with 

 water and mixed with potassium or sodium 

 arsenate (2%). 



This dry method of control was used in 232 

 and 340 trees of two isolated olive orchards. 

 In the olive garden containing 232 bottles, 

 from 5.75 to 6.75% of the olives were maggoty, 

 whereas in an untreated olive grove bearing the 



same variety of olives, from 6-75 to 22.75% were infested. The 



Fig. 23. — Tube con- 

 taining poisoned mo- 

 lasses; F, suspending 

 wire; C, bamboo; R, 

 roll of blotting paper; 

 T. cork; N. canvas 

 ribbon. (After Berlese). 



results of the second experiment are recorded in table V. 



The results of the last experiment appear most encouraging 

 but it must be noted that this olive garden was well isolated and 

 had been sprayed with success during the previous year; it may be 

 possible that there was a reduction of the pest during the year 

 when this dry method of control was used. 



