EXPERIMENTS WITH SPRAY SOLUTIONS FOR GREEN LOGS. 1} 
Consequently, to determine just how effective these solutions were 
against ambrosia beetles (Table IL), the water-soaked logs were 
' thoroughly sprayed with (1) 4 parts kerosene plus 1 part creosote 
oil, (2) the corrosive sublimate solution as given before, and (3) 1 
part crude pyridin preparation to 8 parts kerosene. All the sticks 
were dried for 24 hours before the sprays were applied. These 
materials were applied to three pines, one oak, and one ash log, July 
98,1920. The results are given in Table IT. 
TABLE II.—Results of experiments in the treatment of water-soaked logs 
against anvbrosia beetles.) 
Keroseneand - Pyridin and Corrosive sub- 
Controls. creosote oil. kerosene. limate. 
Pine.| Oak. | Ash. | Pine.| Oak. | Ash. | Pine.| Oak. | Ash. ;} Pine.}| Oak.]} Ash. 
ATE OU Ee eet ee Re. 1 1 7 0 0 0) Ae 0 0 0 0 1 
Oyen seem ctania is sah sea 0 1 23 1 0 0 0 0 1 0 0 3 
TSS CEO eee Baie 1 3 27 0 0 0 | 0 0) 0) 0 5 6 
790 SAN i ada | ROR A AS 5a x x 0 0 1 0 1 0 la 4 16 
Die ree hu Set la 13 64 1 0 0 | 0 0 0 la 0 10 
SPOS Ue Sen nteree SpE rasare (2) (2) (2) 0 0 0 0 0 0 0 0 4 
Soe CT eo Sy Arad a SO 0 4 3a 0 0 0 0 1 2a, it 7 
1 po Fes cane es en (?) (2) (2) 0 0 2 0 0 0 0 0 1 
DAS a: (eae A Lae ee a (2) (2) (2) 0 0 1 | 0 0 0 0 0 4 
Totalambrosia beetles. -..-- 2 19 125 2 0 4 0 | 1 2 1 10 52 
1 Numbers refer to ambrosia beetles attacking except when followed by letter. 
2 Not counted. 
a= species of Ips, type 4. x=—many ambrosia beetles not counted. 
POISONING OF AMBROSIA BEETLES. 
To determine whether ambrosia beetles feed on the bark as they 
bore through it, and consequently whether poison spray could be 
effective against them, several water-soaked ash logs were dried for 
48 hours to remove the excess water from the bark and then com- 
pletely submerged for 48 hours in a solution of sodium arsenate, 2 
pounds to 10 gallons of water. 
A wooden frame with a cheesecloth bottom was prepared on the 
ground, and on supports above this frame a rubber cloth was sus- 
pended to keep any rain from reaching the treated sticks. The sticks 
were placed in the box on the cheesecloth and the cloth was carefully 
examined every two or three days for dead ambrosia beetles. The 
treatments were made on May 30, 1920. An untreated control was 
used in the same position. The results were as follows: 
June 8, one dead beetle beneath sticks. 
June 15, one beetle boring through bark. 
June 23, two beetles boring through bark. 
July 23, two to six beetles were in each stick and all galleries contained 
eggs and various stages of larve. 
These beetles were evidently not deterred or injured by the poison. 
At no time were the sticks wet. It is quite probable that the dead 
beetle found June 8 was not killed by the poison, since no other dead 
insects were found. 
