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posed tent caterpillars, Malacosoma americaua Fab«, were better than on 
cankerworms, Alsophila pometaria Harris. 
Ewing and McGarr (134) in 1937 reported that neither powdered derri: 
nor cube (each containing about 4 percent rotenone) showed any promise 
when dusted on cotton flea hoppers in cages. Cube root mixed with pheno- 
thiazine failed to jive promising results. 
Morrill and Lacroix (287) in 1937 reported tests to control the 
potato flea beetle, Epitrix cucumeris Harris, o : shade and field tobacco 
in tobacco in the Connecticut valley. The following dusts containing 
rotenone were tested: 
1 part cube pov;der (4> rotenone) plus 3 parts 
sterile tobacco dust (finely ground and certified by 
the manufacturers to be a by-product in the manu- 
facture of nicotine sulfate) applied at the rate 
of 4 to 3 lbs. per acre. 
2 parts cube powder (4y rotenone) plus 8 parts barium 
fluosilicate applied at the rate of 4 to 8 lbs. per acre. 
Dust containing l)'o rotenone applied at the rate of 
12 lbs. per acre. 
1 part cube powder (l% rotenone) plus 1 part barium 
fluosilicate applied at the rate of 15 lbs. per acre. 
Proprietary dust containing 0.55/a rotenone applied at 
the rate of 12 lbs. per acre. 
Proprietary dust containing 0*83,. rotenone applied 
at the rate of 8 lb., per acre. 
All these treatments, and also cryolite gave a distinct improvement 
over the untreated check. The mixture of cube root powder and tobacco dust 
showed the highest number of dead beetles and the next to the least total leai 
injury. The mixture of barium fluosilicate and cube root powder was somewhat 
more effective if judged by tho number of live beetles and the total leaf 
injury. This superiority is not believed to be sufficient to justify the 
increased cost of the mixture, since >..ach material was used at nearly the 
same strength as when used alone. 
Cube as a spray was also t .stud against tho tobacco thrips, 
Franklinicllo. fusca Hinds. The cube powder (4,j rotenone) was tried at 5 lbs 
and also at 12 lbs. per 100 gals, plus sulfonated phenylphenol at 1:400 as a 
spreader, liono of the materials (nicotine, pyrcthrum, and lauryl thiocyanatt 
were included) proved satisfactory. 
