BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 39 
A 60-percent aldrin nonemulsifiable preparation was tested in water 
mixtures at spray temperatures of 50°, 75°, and 100° F. At the recom- 
mended rate of 2 ounces of aldrin per acre, the 100° spray gave an 
average kill of 81 percent. The cooler sprays gave 53- and 51- percent 
kills. 
Mormon Cricket Control 
Mormon crickets controlled in five western States 
During 1953 more than a half-million acres in five States were baited 
to control a Mormon cricket outbreak threatening several million 
adjacent acres. This was the third year of a typical Mormon cricket 
buildup. Poisoned bait distributed from mid-April through June 
m Xevada, California, Utah, Idaho, and Colorado halted the biggest 
outbreak of these insects that has occurred since 1940. Control efforts 
were carried out cooperatively with Federal land-managing agencies, 
States, counties, communities, and organized groups of individual 
ranchers. Xew insecticiclal materials — mostly aldrin in steam-rolled 
wheat — and rapid methods of bait distribution with aircraft and 
modern ground equipment made it possible to achieve excellent kills 
within a few hours after treatment. The 1953 control work prevented 
crop damage, stopped migrations, delayed and possibly prevented a 
potential major Mormon cricket outbreak. 
Three new toxicants tested in Mormon cricket bait 
Preliminary field tests in Xevada with three new insecticides as 
toxicants in poisoned bait for Mormon cricket control showed that 
2 ounces of aldrin, 1 ounce of dieldrin, or 4 ounces of heptachlor were 
as effective as either toxaphene at 1 pound, or chlordane at y 2 pound, 
per 100 pounds of carrier. 
Cutworms 
In experimental work, four insecticides have given practically com- 
plete control of cutworms in wheat. These are DDT at 1 pound, 
dieldrin at 0.2 pound, endrin at 0.27 pound, and CS-708 at 1 pound 
per acre. BHC and parathion gave very poor control. Toxaphene 
at 2 pounds per acre gave slightly better than 90-percent control. 
Cooperative Work With Wheat Develops Hessian Fly-Resistant 
Strains 
Twenty-four soft and hard red winter wheats, including the out- 
standing hessian fly-resist ant strains resulting from breeding work 
conducted in cooperation with the Bureau of Plant Industry, Soils and 
Agricultural Engineering and State agricultural experiment stations, 
were tested in uniform nurseries at several agricultural experiment 
stations. Derivatives of W38, Marquillo, P. I. 94587, and Ribeiro 
showed no or low hessian fly infestations as compared with from 
20- to 85-percent infestation in susceptible checks. 
Insecticides Tested Against Corn Earworm 
In tests of various insecticides conducted in Texas, Illinois, and 
Indiana, DDT at 0.5- to 0.75-percent strength, heptachlor or dieldrin 
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