234 



Bulletin 176. 



experiments which lie made with it that year, led him to strongly 

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

 Soon a dendrolene was placed upon 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. 



We must conclude that neither raupenleim 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 tlie following results : 



When applied. 



July 7, 1898. 



Number 

 of trees 

 treated. 



34 



When examined. 



May 26, 1899. . . \ 

 June 30, 1899. . . f 



Number 

 of trees 

 infested. 



i Largest 

 Number number 

 of borers of borers 



found. 



13 (38^) 



19 



m one 

 tree. 



Effect of 

 applica- 

 tion on 

 tree. 



None. 



Years. 



1898-1899.. 



Untreated or check trees. 



Same dates 



41 



Apparently the pine tar kept out a few borers, but not enough to 

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

 borer. 



