234 



Bullp;tin 176. 



experiments which he made with it that yeai-, led him to strongly 

 recommend it as a general application for borers and other insects. 

 Soon a dendrolene was placed npon the market and it has been 

 tested in several States, but practically all reports show that it 

 either seriously injured or killed all fruit trees on which it was 

 applied. We treated 50 trees in the same manner as with the 

 raupenleim, and the following table shows that our results agree 

 with most other records : 



1896-1897. 



When applied. 



July 10, 1896. 



Number 

 of trees 

 treated. 



50 



When examined. 



June 23-30, 1897. 



Number 

 of trees 

 infested. 



Number 



of borers 



found. 



Effect of applica- 

 tion on trees. 



Killed every tree 



We must conclude that neither r8,upenleim nor its imitation, 

 dendrolene (the kind now on the market) is a safe application for 

 young peach trees. In figure 56 is shown the effect of the applica- 

 tion of these substances on our trees. 



Pine tar. — We used some " pure North Carolina pine tar" as a 

 wash with the following results : 



Years. 



1898-1899 . . 



Untreated or check trees. 



56 Same dates 



25 {U%) 



41 



Apparently the j)ine tar kept out a few borers, but not enough to 

 warrant is being recommended as a preventive of the peacli-tree 

 borer. 



