1917 



ENTOMOLOGICAL SOCIETY, 



129 



It will be seen from the above table that practically absolute control was 

 secured with the carbolineum treatment. Unfortunately, the entire check row did 

 not show a high percentage of infestation, but it is suilicient to indicate that the 

 treatment was effective. In addition to the carbolineum a high crade creosote was 



Showing treated row on each side of a check. Note 

 the almost black color of the treated rows. 



also tried in a limited way. The creosote also gave perfect control and this 

 indicates well, for the row treated stood directly next the check row. The carbo- 

 lineum gave the. bark of the trees a beautiful bro\ni appearance, but it in no Avay 

 affected the vigor of the trees. This brownish coloration gradually becomes re- 

 duced during the summer, but treated trees can be recognized easily at least three 



*In order to determine the infestation in the treated trees not all of the 14,000 trees 

 were examined. Rows were selected. h»wever, in different parts of the block and every 

 tree examined carefully. In this way, 1,161 trees were closely scrutinized and not a sign 

 of borer work could be found. Based on the result of this examination the figures in 

 the table have been prepared. In the second examination a single larva was found at 

 work on one of the treated trees, but as this was the rare exception the fact has been 

 ignored in the percentage column. 

 9 E.s. 



