126 



THE EEPOET OF THE 



^0. 3B 



rows were selected at the end wliich showed the greatest amount of the feeding work 

 of the beetles. On December 4, 1914, groups of twenty trees were each treated with 

 pure kerosene emulsion, carbolineum and carbolineum emulsion. Eows were left 

 between for checks. The material was applied directly to the trunks up to the 

 younger growth. On April 9, 1915, twenty-five trees were treated with pure 

 kerosene emulsion, fifty with carbolineum emulsion and twenty-eight with pure 

 carbolineum. Just previous to these treatments the trees in the whole block had 



Three pupal chambers in a small 

 3-year old nursery tree. 



Pupa in its cell. 



been pruned carefully. The material was carefully brushed over the trunks, cover- 

 ing all the cut surfaces of the recently removed branches. 



The experiment was examined on June 28. The block as a whole showed a 

 severe infestation, sawdust being present at the base of a great many trees, and this 

 could be seen for a long distance down the nursery rows. In the rows treated 

 with carbolineum or its emulsion no sawdust could be seen and the trees were 

 vigorous growers, the trunks showing a beautiful brown color but not an indication 



