244 Bulletin 176. 



combined with the " digging-ont " method for the reasons mentioned 

 on pages 208 and 237. Make whichever combination best suits your 

 conditions. 



If you find, after a preliminary test on a few trees, that you can 

 use gas tar without injuring your trees, we beheve it will prove to be 

 the most effective and cheapest method of fighting the peach-tree 

 borer ; but use it carefully and intelligently, as trees have been 

 injured by its use. 



We began this investigation confident that some sure preventive 

 of the entrance of the borers into the trees would be found. There 

 was nothing lacking on our part to have the substances we tested do 

 all that they were recommended or expected to do. We did not 

 accomplish our ideal, but we have demonstrated that nine-tenths of 

 the methods recommended are useless. Our experiments furnish 

 much definite data for future workers, and form a definite basis on 

 which to make suggestions regarding methods of fighting the apple- 

 tree borer and other borers. Our experiments must lead to a much 

 more rational and intelligent warfare against the peach-tree borer. . 

 Peach-growers will now hnow what not to do^ which is often equally 

 as valuable and important as to know what to do. Finally, our 

 experiments have enabled us to point out with confidence certain 

 methods by which the peach-grower may hope to control his worst 

 insect enemy — the peach-tree borer. 



