66 NEW YORK STATE MUSEUM 
Kerosene emulsion. One tree was painted with an undiluted 
stock kerosene emulsion July 25th. An examination on October 
sth showed very little penetration of the bark in the vicinity of the 
galleries and no living insects were to be found in the burrows 
started prior to the treatment. Some beetles were entering the 
bark at the time of our examination and were evidently not de- 
terred therefrom by the earlier application. 
A 50 per cent kerosene emulsion was sprayed upon another tree - 
the same date, and observation on August 5th showed that the in- 
sects were destroyed in the burrows and that there was also some 
penetration of the adjacent tissues. The outer bark did not seem 
to be affected in the least. 
Scalecide. A 20 per cent solution of this proprietary compound 
was applied to infested trees September 7th and an examination 
on October rst showed living grubs in four out of five burrows. 
In one case the larvae had made their way to a distance of two 
inches from the gallery made by the female. This had a thicker 
bark than the one treated with Barcurol or carbolic acid and the 
comparison was therefore not exactly fair. It is likewise probable 
that the treatment was made too late in the season to give the best 
results, since the grubs were evidently some distance from the 
female gallery and therefore mostly out of reach of the application. 
Carbolic acid. This was prepared by diluting a gallon of soft 
soap with an equal amount of hot water and stirring therein a pint 
of crude carbolic acid (™% pint refined), allowing it to set over 
night and then adding 8 gallons of soft water. This solution was 
applied to trees on September 7th, and examination on October 
Ist showed discolored areas on each side of the main gallery for 
a distance of about three-quarters to one and one-quarter inches. 
There were very few or no grubs found alive and the adjacent ~ 
tissues were’ healthy and apparently uninjured. This treatment 
was made to a thinner barked tree than the one treated with scale- 
cide and the grubs were therefore somewhat more accessible. 
Black leaf 40. A few trees were treated with this material used 
at the rate of 1 to 200 and adding thereto 3 pounds of soap to each 
50 gallons of water. The trees were sprayed September 7th. An 
examination on October rst showed the presence of some living 
larvae under the rather thick bark. This treatment, as in the case 
of others given at this date, was too late for us to expect the best 
results, and in this particular instance was limited to trees with a 
thick bark, the latter rendering the penetration by the insecticide 
more difficult. 
