22 AXXTAL REPORTS OF DEPARTMENT OF AGRICULTURE, 195 3 
Same Recommendations Continue for Black Turpentine Beetle 
Control 
Besl results ill preventing attack by the black turpentine beetle in 
M ssissippi were still obtained with a 10-percent dust and sufficient 
BHC to give 0.25- and 0.50-percent concentrations of the gamma 
isomer in oil If either of these materials is applied to stumps imme- 
diately after trees are cut, breeding by this beetle is prevented. The 
stump loses its attractiveness before the insecticide loses its power to 
kill attacking beetles. 
Residual Sprays Toxic to Western Pine Beetle 
Residual sprays of DDT, BHC, and lindane on the bark of pines are 
toxic to western pine beetles after 60 seconds of contact, according to 
observations in southern California. Residues are even more toxic to 
the California five-spined engraver beetle. These sprays are being 
considered from the standpoint of effectiveness and cost of application 
as a substitute for the fell-peel-burn and penetrating-oil-spray control 
methods now in use. 
Artificial Virus Infection Highly Lethal to European Pine Sawfly 
A 1952 infestation of the European pine sawfly on red pine in New 
Jersey was artificially controlled with virus particles by airplane 
spraying. This work was done in cooperation with the New Jersey 
Department of Agriculture and the Canada Department of Agricul- 
ture. The virus in a water suspension was applied at the rate of about 
'2 gallons per acre, each gallon containing about 2.5 billion virus par- 
ticles. Excellent control of the sawfly was obtained. A water sus- 
pension of this material was also applied as a fine mist to infested red 
pines on Henderson State Forest, Illinois, in cooperation with the State 
Division of Forestry, the State Entomologist of Illinois, and the 
Natural History Survey of Illinois. Results there were also highly 
satisfactory. 
Tent Caterpillars Absolved in Wild Black Cherry Destruction 
The widespread dying of wild black cherry trees in New England 
cannot be attributed to the eastern tent caterpillar, although these 
trees have long been known to be a favored host of this insect. Nor 
can it be attributed to any other insect species. This was disclosed as 
the result of a recently concluded 10-year study in cooperation with 
Harvard University Forest to determine whether the heavy losses of 
young trees of this species in New England were caused by tent cater- 
pillar feeding. 
Treated Wood Still Termiteproof After Twenty Years 
Sed ion- of t rees I rented by Steeping in various chemicals for termite 
protection were placed in contact with the ground at Asheville. X. C., 
Sanfc ,S I .. and Saucier, Miss., in L933. It was found that 76 to BO 
per. rut of those that had absorbed mercuric chloride or sodium 
arsenitc at the rate of \\- 2 pounds per cubic foot were still serviceable. 
