36 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE, 1952 
The clover seed weevil Miccotrogus pioirostris was found for the 
first time in Ohio on alsike clover, in Indiana on red clover, and 
in southeastern Idaho on white clover. A snout beet Le, Sitona I'meata, 
known as a pesl of vetch, peas, and young seedlings of clover and 
alfalfa, was found for the first time in Oregon. 
The Legume insect investigations were conducted in cooperation 
with agricultural agencies in California, Maryland, Ohio, Oregon, 
and Utah. 
Studies of Insects Attacking Small Grain Crops Intensified 
Investigations of insects attacking small grains were expanded 
during the year. Three additional stations were established — at 
( rarden City and Manhattan, Kans., and Denton, Tex. One entomolo- 
gist was placed at each of these stations. Another entomologist was 
added to the already established station at Stillwater. Okla. These 
studies were conducted in cooperation with the agricultural experi- 
ment stations of Kansas, Oklahoma, and Texas and with the Bureau 
of Plant industry, Soils, and Agricultural Engineering. 
Forty-one varieties of wheat, including all of the adapted com- 
mercially grown varieties, were tested for resistance to greenbugs in 
the wheat nurseries operated in cooperation with the Bureau of Plant 
Industry, Soils, and Agricultural Engineering and the Oklahoma 
Agricultural Experiment Station. The most resistant varieties were 
the wheats Seabreeze and Denton, and a rye x wheat hybrid. The oats 
variety Tennex was the most resistant of any of the 36 varieties of 
oats tested. The reaction of 50 barley varieties to a heavy infestation 
of greenbugs under field conditions was tested. Of these, Omugi. 
unnamed C. I. 5096, Tongpori, Dobaku, and Zairai were the most 
resistant. 
In preliminary tests good protection from greenbugs was obtained 
for as long as 6 weeks when barley and oat seeds were treated with 
Systox in activated charcoal. Malathon in early tests appeared to 
be as effect ive for greenbug control as the 1 now recommended parathion, 
although a higher acre-dosage of tin 1 material was necessary. 
Wheat joint worm infestation was heavy in sections of Maryland, 
Virginia, New York, Illinois, and Missouri. Some wheat x Agro- 
pyron strains and 1 wheat variety introduced from France showed low 
in testations or freedom from mfestal ions in nursery tests at Kearneys- 
ville. W. Va., and Columbia, Mo. Plant breeders of the Bureau of 
Plant [ndustry, Soils, and Agricultural Engineering and the States 
of Indiana, Illinois, and Missouri cooperated in these tests. 
STOKIDPRODUCT INSECTS 
Fumigation and Dusting Control Grain-Infesting Insects 
Experimental work on the fumigal ion of shelled corn stored in steel 
bins in Indiana demonstrated thai by the addition of 10 percent by 
volume of met liyl bromide to a 3 : 1 mixture of ethylene dichioride and 
carbon tetrachloride or an so 20 mixture of carbon tetrachloride and 
carbon disulfide, the dosage required to give a completely satisfactory 
kill of all stages of grain-in festing insects could he reduced to '2 gal- 
lons of either mixture per 1,000 bushels of corn. 
