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365 
that the turf is severely injured and often killed outright. Experimental 
work along these lines has been conducted during the past three years and 
the results have been published from time to time. 4 During August and 
September of this year, the writers treated the 27 greens of two local 
golf courses which were heavily infested and severely damaged by this 
insect. A complete report of this phase of the work has been published 
in the October 1923 number of the Bulletin of the Green Section of the 
United States Golf Association. 5 The results indicate that from the 
standpoint of cost and efficiency, the method will have a considerable 
application in the treatment of such valuable areas of turf as lawns and 
golf greens. 
In connection with growing potted plants, it is often desirable to 
have small areas of soil such as cold frames, etc. free of larval infestation 
in order that these potted plants may be plunged therein. Experimental 
work conducted during the past three years indicate that soil treated 
with acid arsenate of lead at the rate of 1,500 pounds to the acre, the 
material being thoroughly worked into the soil to a depth of 4 inches, 
will kill the larva present within a period of two weeks, depending upon 
the soil temperature. The method is now in use within the infested 
area. Experimental results indicate that the majority of plants are very 
sensitive to arsenic but of the hundred odd varieties of plants tested in 
this connection there are several outstanding examples of plants which 
will grow in soil treated at the above dosage of lead arsenate equally as 
well as in the untreated soils. The method has however a limited 
application in this respect and for this reason the writers have been 
carrying on experiments during the past two years with the object of 
coating the individual particles of the lead arsenate with some material 
which will preserve the lead against soil action and thereby protect the 
toxic properties until it is taken into the stomach of the larva. This 
work is now being continued along these lines with several definite leads 
in sight. 
Teach, B. R. The Japanese beetle in relation to golf courses. 1921. In Bui. 
Green Sect. U. S. Golf Assoc. 1, no. 10, 210-211. 
Leach, B. R., and Thomson, J. W. 1923. A control for the Japanese beetle 
larvae (Popillia japonica Newm.) in golf courses. In Jour. Ec. Ent. 16, 312-314. 
Leach, B. R., and Thomson, J. W. A control for the Japanese beetle larvae 
(Popillia japonica Newm.) in golf greens. In Bui. Green Sect. U. S. Golf Assoc. 
3, no. 6, 173-174. 
Teach, B. R., and Johnson, J. P. 1923. The Japanese beetle; its life-history and 
control in golf greens. In Bui. Green Sect. U. S. Golf Assoc. 3, no. 10, 262-268. 
