The Peach-Tree Borer. 



231 



inches in diameter. It is a very cheap wash, is easily apphed, does 

 not injure the trees, and lasts as long as desirable. Thus, theoreti- 

 cally, it is an ideal mechanical preventive coating or wash. 



We gave this wash a thorough test in 1898-1899, with the follow- 

 ing results : 



When applied. 



July 7, 1898.... 



Number 

 of trees 

 treated. 



47 



When examined. 



May 26, 1899. 

 June 30, 1899. 



Effect of 



I Largest 



Number Number ' number „„„):„„ 



of trees of borersof borers' ^km on 



infested. I found 



26 (55^. 



36 



in one 

 tree. 



tree. 



None. 



Years. 



1898-1899 



Untreated or check trees. 



56 



Same dates. 



25 (44^. 



41 



This table shatters another theoretical ideal, for there were more 

 infested trees among the treated than among the untreated ones, 

 and just as many borers got into the treated trees. We had 

 expected much more encouraging results from the use of this cement 

 wash, but it evidently has not the qualities which will make it of 

 any value to the peach grower. 



Printer's ink. — This seemed to us to have qualities which might 

 make it a good wash for the peach-tree borer, hence we tested it 

 with the followinij results : 



Years. 



1898-1899 , 



Untreated or check trees. 



56 



Same dates. 



25 (44^. 



41 



Although the ink kept out about one-half of the borers, it caused 

 gummy exudations where it was applied, indicating injury to tlie 

 bark, hence it is not to be recommended. 



