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Eurydema c ma tu rn (L, ) 
This bug or. cauliflower is repelled by a proprietary product con- 
taining 0.72 percent of rotenone, according to a letter from the manufac- 
turers, the Etablissements Rotenia, to R, C. hoark in 1938. 
Eurydema pulchru:: TTestw, 
Spraying with derris kills this insect on cabbage, — Van der Yecht 
(90) in 1936. 
o 
Euschistus impictiventris Stal, a brown cottonbug 
Cube dust gave 43-percent control (the b°st of seven insecticides 
tested) and derris dust 38-percert control in tests made on ceged cotton 
plants in the field and in lantern globes in the insectary. In plat tests 
cube was less effective (45.2-percent control) than derris (62.8-percent 
control). — Cass idy and barber (10) in IP 35. 
tlurga ntia histrionica (Hahn), the harlequin bug 
Brannon (4) in 1933 reported the results of tests against the 
harlequin bug with rotenone dusts and sp r:ys at Norfolk, Va. Very poor 
results were obtained with the trection duster, even though the nozzles 
were arranged in several different ways. lest results were obtained when 
heavy applications were made with a hard duster. Counts indicated that 
a commercial derris dust at the rate of 38 pounds per acre had a repellent 
action. Practically no kill vas obtained with a derris extract (5 gm. 
rotenone par 100 cc. of acetone) at 1:200 in an experiment made when the 
temperature was S8 f ° F. and the relative humidity 76 percent. The same 
materials gave excellent results when the temperature was 83° and the 
relative humidity 84 percent. 
Gilmore (32) in 1933 reported that at Clarksville, Tenn., a field 
test against the harlequin bug with a mixture o^ equal parts of derris 
dust and tobacco dust :;ava entirely unsatisfactory control. 
C. E. Smith (78) in 1933 reported on tests to control the harlequin 
bug at Baton Bouge, Lj. Dusts containing 1, 2, 3, and 4 percent of 
rotenone were tested in cages in the field. The following respective hills 
wore obtained within 144 hours: 71.4, 61.9, 90.4, and 95.2 percent. 
Because the kill obtained with the 2-percent dust was rather lo 1 ^, it was 
replicated, giving a 94-percent kill in 144 hours. 
halker and Anderson (92) in 1935 reported tests made at Norfolk, Va,, 
on the control of the harlequin bug with various pyre thrum and nicotine 
preparations and with the following four derris dusts: Ku-ba-tox, Sentone, 
Derrax, and an air-floated, powdered derris rcot alone an-; 1 in combination 
unti: an inert carrier; also three derris sprays, viz, Noxon Plant Spray, 
Serrid, and Super Agriculture] Spray, 
