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pounds of DDT. At the end of 8 weeks in the soil 2 pounds of chlordane 
were required to equal 25 pounds of DDT. In field tests 10 pounds of 
technical chlordane per acre reduced the larval population more rapidly and 
more completely than did DDT at 25 pounds per acre. In these tests the 
chlordane was applied as a 5-percent dust to the surface "by means of a 3- 
foot fertilizer spreader. — Fleming (122.). 
All stages of the Japanese "beetle in soil are killed "by dipping "balled 
or potted plants in an emulsion prepared "by adding 1 fluid ounce of the 
following solution to 10 gallons of water: 
Percent "by weight 
Ethylene dihromide 13.0 
Chlordane (technical) 6.5 
Cellosolve (ethylene glycol monoethyl ether) 6.5 
Tveen 20 6.5 
Isopropyl alcohol 67 .5 
— Chisholm ai*l Mason (26); Mason and Chisholm Ql8). 
Japanese "beetle adults may "be controlled "by a 50-percent chlordane 
wettahle powder used at the rate of 2 teaspoons to a gallon of water and 
applied to vegetation at weekly intervals during July and August. This 
dosage of chlordane is 1/2 that recommended for DDT. — Schread ( 405 ). 
Chlordane as an emulsion was not as effective as DDT or "benzene hexa- 
chloride from the standpoint of either knockdown or residual effect. — 
Langford and Squires ( 284 ) . 
Aldrin proved more toxic than chlordane against Japanese "beetle grubs; 
6 pounds of aldrin in 10 days gave greater grub reduction than 10 pounds of 
chlordane in two weeks. — Schread ( 4-10 ) . 
In tests made in Connecticut in 1946, 19^7, and 1948 chlordane at 8 
pounds per acre was effective against Japanese "beetles at the end of 18 
months. — Schread ( 409 ). 
In 1949 the U. S. Bureau of Entomology and Plant Quarantine (462, 470 ) 
recommended chlordane for grub control where quick action is needed. Chlor- 
dane kills the grubs faster than either DDT or lead arsenate. Use 10 pounds 
of actual chlordane per acre in a dust or spray. A chlordane treatment 
should last at least 2 years. 
Adams and Matthysse (£) of Cornell University recommend chlordane at 
the rate of 10 pounds per acre for the control of Japanese "beetle gruos. 
Chlordane acts more rapidly than DDT, killing grubs in from 2 to 3 weeks 
after application. Indications are that its effectiveness will persist 
for a least 2 years. 
