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A spray containing not less than 0.005 -percent rotenone applied at the 
rate of 144 gals, per acre increased the yield of peas about 100 percent. 
A cube-talc dust gave good results when applied at the average rate of 
46 lbs. per acre. 
Brannon (43) in 1937 summarized the results of insecticide tests 
performed against the Mexican bean beetle in 1936 on Fordhook lima 
beans, at the Norfolk, Va. , laboratory. The best control was obtained 
with dust mixtures of derris- sulphur and cube-sulphur, each containing 
0.5 percent rotenone. Derris-wettable sulphur and cube-wettable sulphur 
sprays (each containing 0.01 percent rotenone) also gave good control 
of the insect. The percentage of control with the dust mixtures was 
slightly superior to that obtained with the sprays. 
Brannon (44) in 1937 reported that the sweetpotato leaf beetle, 
Typophorus viridicyaneus Crotch, has developed into a pest of distinct 
importance in northeastern North Carolina. Results of cage toxicity 
experiments demonstrated that undiluted calcium arsenate was more toxic 
to the insect than was a derris or cube dust mixture containing 0.5 
percent rotenone or a water suspension of ground derris root contain- 
ing 0.02 percent rotenone. 
The Illinois Agricultural Experiment Station (212) in 1937 
issued directions for spraying fruits in Illinois. The currant worm 
on currants and gooseberries may be controlled by spraying with 8 
pounds ground derris or cube (containing 0.75 percent rotenone) in 100 
gallons of water. Spraying should be done before the worms appear, just 
after the plants come into full foliage. 
Danzel (ill) in 1937 stated that derris has a greater activity 
than cube or other rotenone-bearing plants, but no experimental figures 
are presented. 
Spoon (390) et al. of the Koloniaal Instituut of Amsterdam 
in 1937 compared the relative insecticidal value of dusts made from 
derris and cube. Sight sets of powders were prepared, each set con- 
sisting of one powder prepared with Derris, the other with Lonchocarpus, 
both powders containing equally high amounts of rotenone and ether 
extract. These powders were mixed with diatomaceous earth in order to 
obtain dusts with definite amounts of rotenone (0.5, 0.75 and 1 percent), 
according to the sensitivity of the varioxis insects. 
The dusts containing 0.5 percent rotenone were tested on larvae 
of Lophyru s pini L. and on Myrmica ruba L.; those with 0.75 percent 
rotenone on caterpillars of Euproctis chrysorrhoea L. ( Nygmia 
phaeorrhoea Donovan) and on M. rubra L.; those with 1 percent rotenone 
on M. rubra L. only. 
The results, shown in diagrams, are based on the observation of 
120 specimens at least. The heights of the columns show the percentages 
of dead insects after 24 hours. In 7 of the 8 sets the effect of Derris 
is stronger than that of Lonchocarpus. The effect of Derris dust on 
caterpillars of Euproctis chrysorrhoea ( Nygmia phaeorrhoea ) and on larvae 
