12 awtal REPORTS OF DEPARTMENT OF AGRICULTURE, 1919 
borer larvae, some of which contained small larvae of Apa 
thompsoni Lyle. 
Small shipments <>!" two pa of the Bweetclover weevil from 
: ope wen- received at the North Dakota Agricultural Experiment 
Station for rearing and colonization. 
Benzene Hexachloride and Parathion Control Greenbufpl 
In preliminary tests conducted in cooperation with the Oklahoma 
Agricultural Experiment Station, benzene hexachloride dusts 
taming 3 and ."» percent of the gamma isomer applied to winter oats 
at 12 pounds per acre gave excellent control of greenbugs for several 
weeks. A 3-percent hexaethyl tetraphosphate dust ana a dust con- 
taining 5 percent of DDT ami sufficient benzene hexachloride t<» give 
•J..", percent of the gamma isomer also gave good initial control, l»ut 
within 3 weeks the infestation was higher than before the insecticides 
were applied. Dusts containing lower percent the gamma 
isomer of benzene hexachloride, 5 percent of DDT, or l percent of 
rotenone gave poor control as compared with t be benzene hexachloride 
and bexaethy] tetraphosphate treatments. 
Two-percent parathion dust was at Least as effective as benzene 
hexachloride dust containing 3 or 5 pereent of the gamma isomer. Pre- 
liminary tests bave also indicated that barley plant- will translocate 
parathion from treated soil to the leaves in sufficient quantities to kill 
greenbugs for 5 to 6 weeks after t reatment. 
Toxaphene Effective Againal Meadow Spittlebug 
During the Last few years the meadow spittlebug has seriously 
injured Legumes and other plant- in the Eastern and Lake States, and 
bas interfered with blossom format ion and seed setting in alfalfa. In 
R consin spittlebug infestations bave been increasing in severity and 
extent for more than 1<> years. In experiments conducted in coopera- 
tion with the Wisconsin Agricultural Experiment Station, good con- 
trol was obtained with insecticidal sprays applied at low pressures 
and Low gallonages per acre. Toxaphene, either in emulsion or in 
water suspension, appeared to be the best material tested, being effec- 
tive at a dosage of as Little ;i- L% pounds per acre. Chlordane at 1 
and _ pounds per acre in emulsions and suspensions was also effective, 
Inn not so uniformly so as suspensions and dusts of tin- insecticide 
were in L947. Suspensions ^\' benzene hexachloride containing 5 per- 
cent of tin- gamma isomer applied :it the rate of p._. pound- of the 
technical material per acre ana a DDT emulsion at l pound of DDT 
per acre have shown some promise. Parathion as a water suspei 
at one-quarter pound of the technical materia] per acre gave Little 
com rol. 
\rw Insecticides Control Southern Corn Rootworm In Peanuts 
Tlic southern corn rootworm has recently been causing heavy 1< 
of peanuts in Virginia and North Carolina, In some years as many 
