THE CANADIAN ENTOMOLOGIST 



283 



It is evident from tables V and VI that the use of these sacs 

 in isolated olive gardens did not give as good results as the use of 

 the poisoned bait spray during the previous years. 



In a non-isolated orchard containing 675 olive trees, each tree 

 was provided with a sac. This orchard had never been sprayed. 

 The results showed that 15 to 32.5% of the olives were infested 

 in this olive garden, whereas in a neighbouring olive plantation 

 bearing the same variety of olives 26 to 39.67% were attacked by 

 the pest. It is apparent that little value can be attributed to this 

 dry method of control in a non-isolated olive grove. 



_ 



Fig. 25. — A. roll of absorbent paper stuffed with a mixture of bran 



and poisoned molasses; B, same in section; C, fastened 



to a branch. (After Bertese). 



A third system classed under the dry method of control" was 

 to wire to the branches of an olive tree, a sheet-iron or galvanized- 



