128 



THE EEPOET OF THE 



No. 36 



TABLE II. 



Cryptorhynchus lapathi, 



I 



Linn. 



Treatment 



When No. 

 Applied pTrees 



Examined 



No. 

 Infested 



Larvae 

 per Tree 

 CAverage) 



Not [Percent. 

 Infested! Infested 



Kerosene emulsion, Cpure') 



Carbolineum 



Carbolineum 

 Check 



emulsion . , 



Dec. 4,1914 

 Apl. 9.1915 

 Dec. 4,1914 

 Apl. 9,1915 

 Dec. 4,1914 

 Apl. 9,1915 



1 



2.25 



2.4 



14 

 9 

 20 

 27 

 20 

 50 

 60 



30 

 64 

















 48.3 



The success of the preliminary experiments led to the trial of the carbolineum 

 treatment on a commercial scale. In the fall of 1915 arrangements were made to 

 treat two entire blocks of poplar trees in two large nurseries. This was m;ide 



One of many piles of discarded poplars in nursery. 



possiljle by the courtesy of the owners who provided all the material, help and 

 necessary equipment, the writer taking charge of the work. Each block of trees 

 contained approximately 14,000 trees. Owing to the excessive snowfall during the 

 winter of 1915 and 1916 it was not possible to apply the carbolineum as early as 

 was intended. Eurthermore, it was also delayed somewhat in order that the trees 

 should be pruned. 



On April 8, 1916, 21 rows in one block were treated. As the day was cold, 

 threatening snow and sleet, the work was discontinued. During the following day 

 over three inches of snow fell and the remainder of the block was not treated till 

 April 13. In the meantime the borers had begun feeding, in fact were active since 

 about the early days of April. The results of the treatment in this block are 

 shown in the following table: 



