92 



Fab., was by far the most numerous, but other insects assist somewhat 

 in the injury, among them Atimia confusa Say. The first or second 

 year after the borers have begun work the woodwork is greatly 

 marred by the exit holes which are left in the bark. 



May 13, 1901, we received information from Dr. R. H. Lawton, 

 together with accompanying specimens, that Ilylotrupes ligneus was 

 the cause of considerable trouble in the cedars in his vicinity. March 

 30 the beetles made their appearance in an office in that town and 

 were very plentiful until the middle of April, when they disappeared. 

 Dr. Lawton found in a basement a pile of cedar sticks from which 

 the insects had emerged. The sticks were badly damaged and fully 

 accounted for the number of the beetles. 



There seems to be no practical remedy when cedar wood is used for 

 outdoor ornamental purposes. If it were kept indoors for a season or 

 more and saturated in April and May with gasoline, or some similar 

 preparation, it might be kept free from infestation and in time the 

 wood would be so dry that the borers would not attack it.— F. H. C. 



INEFFECTIVENESS OF KEROSENE EMULSION AGAINST WHITE GRUBS. 



One of the remedies which has been frequently suggested as of 

 value against white grubs is the kerosene emulsion. Its use has been 

 advised in various publications and in the correspondence of this 

 Division. 



Kerosene emulsion diluted with 15 parts of water, applied to celery 

 by Mr. Lull, formerly of this Division, in 1893, did not injure the 

 plants, but killed the larvae of AUorhina nitida which were at or near 

 the surface of the ground, but apparently failed entirely to reach such 

 larvae as were at a depth of two inches or more beneath the surface. 

 This matter was brought to the attention of the public in Bulletin No. 

 10, in an article by Dr. Howard (p. 25). 



Mr. W. K. Shaw, acting upon our suggestion, tried kerosene 

 emulsion against larvae of Lachnosterna, presumabh' Lachnosterna 

 fusca, the common white grub of Massachusetts, in the vicinity of 

 Boston. He was at first of the opinion that it killed the small grubs 

 but did not affect the larger ones. Later he could not see that the 

 most careful use of this emulsion was effective against these white 

 grubs. 



There is no doubt about the strength of the emulsion, as Mr. Shaw 

 is a graduate of the Massachusetts Institute of Technology, and direc- 

 tions for the preparation and application of this insecticide were fol- 

 lowed implicitly, the ground having been thoroughly soaked, and in 

 each case followed by an effective rain to wash the kerosene more 

 thoroughly into the ground. 



