474 



BULLETIN 388 



brown color but no indication of borer work (fig. 125). The kerosene emul- 

 sion had no appreciable effect, nor did it injure the trees though it was 



applied in large quan- 

 tities. 



The treatments ap- 

 plied and the results 

 obtained are shown in 

 table 2. Kerosene 

 emulsion applied pure 

 in December seems to 

 have had some effect, 

 but one cannot safely 

 draw conclusions from 

 the result shown. The 

 infestation of 30 per 

 cent is high, though 

 the average number of 

 larvae per tree is at a 

 minimum. The car- 

 bolineum applied 

 either pure or in emul- 

 sion gave almost abso- 

 lute control. This seems to the writer to be a very simple and effective 

 means of control under nursery conditions. 



TABLE 2. RESULTS OF EXPERIMENTS OF 1914-15 



FlG. 125. TREES TREATED WITH CARBOLINEUM AND ITS 

 EMULSION, SHOWING DARKENED TRUNKS. CHECK ROW 

 IN CENTER 



One half-grown larva was found in July, in an area evidently not thoroughly treated. 



