-96- 
A spray of 1 pound of DPT in 100 gallons of water, together with 
a conditioner, gives excellent protection against the rose chafer. A 
10-percent DDT dust controls the rose chafer •--Huts on (220). 
Phyllophaga spp., white grubs 
In a few preliminary tests Gesapon No. 18, at a dilution of 
approximately 8 ounces of DDT per 100 imperial gallons of water had no 
apparent effect on eggs, and little or none on 6econd-instar grubs when 
the emulsion was either poured or injected into the soil.— Ross (306 ) . 
In a single test at Lafayette, Ind», a dust containing 5 peroent of 
DDT applied to the soil in a cage at the rate equivalent to 242 pounds 
of DDT per acre and washed in with a copious sprinkling of water had no 
effect on the white grubs that had been placed in the soil. Young corn 
plants about 8 inches tall were visibly affected. This was a very pre- 
liminary experiment, however, and cannot be considered conclusive.— 
Packard (285) • 
Popillia japonica Newnu, the Japanese beetle 
Preliminary tests with J3DT in 1943 indicated that this material was 
the best protective agent ever used against the adults and that it 
appeared very toxic to the larvae in the soil. The tests were continued 
in 1S44 on a much larger scale. Laboratory tests indicated that the 
duration of effectiveness of DDT may be reduced when it is used with 
bordeaux mixture, wettable sulfur, lime-sulfur, or tank-mix copper 
phosphate, but Fennate did not seem to modify its effectiveness. In 
field tests one application of a spray containing DDT 1 lb., pyrophyllite 
1 lb. (micronized together), fish glue solution 1 pt. (l lb. of liquid 
glue per gallon^ summer oil emulsion 1 quart, and water to make 100 
gallons at the rate of 1 pound per 100 gallons, at or just prior to the 
beginning of the beetle season, gave satisfactory protection to the fruit 
and foliage of early ripening peaches and apples, blueberries, and 
miscellaneous ornamental and shade trees and shrubs. As many a6 three 
applications were necessary to give satisfactory control on grapes on 
account of the development of new growth during the beetle season. 
Flowering plants and ornamentals producing blooms and new growth while 
the beetles are flying also required up to three applications. In other 
field tests, turf and nursery plots were treated with DDT applied as a 
spray or dust* "When applied as a spray, the 50-peroent micronized DDT- 
pyrophyllite mixture was U3ed at 2 pounds to 100 gallons of water. The 
best dust mixture consisted of DDT 10, pyrophyllite 10 (micronized to- 
gether), talc 78, and tricalcium phosphate 2 percent. The results in- 
dicate that this material is more toxic than lead arsenate and that a 
dosage of 25 pounds per acre, applied either as a dust or as a spray, 
will practically eliminate the larval population.— Kadley and Fleming 
(196). 
