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Derrisol controls cabbage Trams, according to ?ln. Cooper and Nephews, 
Inc., in a letter to P.. C. Roark, dated November 16, 1937. 
The Louisiana Agricultural Experiment Station (257) in 1937 recom- 
mended derris dust (1 percent rotenone) for the control of cabbage vrams. 
Derris dust (1 percent rotenone) was worthless against the Europe 
red moth. A spray of l-l/4 to 2 pounds of derris powder (4 percent rote- 
none) plus 5/8 pound of Aresket per 100 gallons of water killed 99 percent. 
— Manschke ( 268 ) in 1937. 
The Rotenone Chemical Company, Inc., Los Angeles, Calif., in advertr.s- 
ing literature in 1937 recommended [derris] Sarfoot No. 1 and Barfoot No, 2 
diluted 1:800 for the control of leaf rollers. 
C. E. Smith (372_) in 1937 reported that field tests at Baton Rouge, La., 
showed that derric-du.st mixtures containing 1 or 0.5 percent of rotenone 
were superior to nicotine-peat dust in controlling the mere common species 
of cabbage worms. 
Stanco, Inc., in advertising literature in 1937 recommended [derris] 
Garden Flit for use against cabbage worms and tomato worms. 
Dibble (_97_) in 1938 recommended derris or pyrethrun dust or spray for 
the control of cabbage worms. Early control keeps the population low and 
prevents much difficulty later. Sprays do not stick well on cabbage and 
dusts are often given first choice. In large patches spraying is cheaper 
if good equipment is available. 
Dunlap and Turner (102) in 1938 recommended dust (0.75 percent rote- 
none) for the control of cabbage worms on cabbage, cauliflower, broceoi:. 
and brussels sprouts. It should be applied v.hen larvae first hatch a. 
again 10 days later at about 20 pounds per acre. 
The Idaho Agricultural Experiment Station ( 210 ) in 1939 reported that 
the season's work showed rotenone dust to ho effective against cabba 
worms . 
G. D. Jones ( 224 ), of the University of Missouri Agricultural Ext- - 
sion Service, in 1936 recommended a dust containing 0.5 to 1. 
rotenone to control cabbage worms. 
The New Jersey Agricultural Experim.r-r.t Station ( 294 ) bed 
that caterpillars protected by rolled leaves -'ere . sontr 
torily by derris or cube powder in water to vjhioh rosin-residuc 1 '.on 
had been added. 
The New York State Agricultural (30 in 193 
ported that for cabbage worms arsenical dusts ar most ec rid 
are recommended for use on cabbage that is to be trimmed close; but c: 
ket cabbage, broccoli, and caulif lower, wh ' r Loal residue must bo 
avoided, tho use of rotenone ducts or sprays is rcc 
