- 80 - 
Cottony maple scale (P ulvinaria vitis L. , Eomopterp, Coccidae) 
on maple trees was fairly well controlled. Nicotine was better. The spray 
acts as a contact poison. 
Spider mites ( Tetranychus telarius L. , clrss Arachnida, order 
Acarina, family Tetranychidae) on spruce, juniper, and privet trees were 
controlled in four tests out of six tests made. The spray acts as a contact 
poison. Probably not effective against the eggs. 
Wallis (455), in February 1S38, summarized the results of tests 
performed with insecticides against the Mexican "bean "beetle in Colorado in 
1937. Be reported that sprays containing derris and cube gave "better 
results than any other materials tested, the increase in yield ranging from 
10.4 to 4S.7 percent ovr>r the check plots. 
Elmore (126) in 1938 reported tests of insecticides against the 
tomato pinworm, ^norimo schema lycopersicella Busck, at Alhambra, Calif. 
Cube extract was ineffective. Cryolite and cuprous cyanide, in either sprays 
or dusts, were the most effective. 
3ntchelder (21) in 1933 reported that during the previous year at 
New Haven, Conn., derris spray reduced the corn borer population in ears 
of early market sweet corn 77 percent. Cube dust reduced the corn borer 
population infesting dahlias in experimental plots about 90 percent. 
Huckett (207) reported tests of cube mixed with each of the following: 
sulphur, sulphur and celite, bordeaux mixtiire, and eclite and clay for the 
control of the Mexican bean beetle, Ppilachna varivastis Muls. Two samples 
of cube powder were compared, one analyzing 2 percent rotenone and 18 percent 
total ether extractives and the other 5 percent rotenone and 12 to 14 percent 
total ether extractives. These powders were applied in sulfur spray and 
dust mixtures at strengths equivalent to 4 pounds of cube powder to 100 
gallons of wettable sulfur spray and 10 pounds of cube powder in 100 pounds 
of a cube plus celite plus ground sulfur dust mixture. 
Kuckett concludes that according to larval population counts of 
E. varivestis and yield of pods, mixtures containing cube powder of 2 per- 
cent rotenone and 13 percent total ether extractives were as effective at 
the dosages used as those containing cube powder of 5 percent rotenone and 
12 to 14 percent total ether extractives. 
In field tests on lima beans sprayed and dusted with copper-lime 
mixtures for control of plant diseases it was observed that bordeaux mixture, 
as applied, possessed considerable merit in that it had notably reduced 
the amount of feeding by E. varivestis . This effect, it was observed, was 
slightly enhanced by the addition of cube powder to the mixture at the time 
of application or by making separate applications of cube-clay dusts fol- 
lowing treatment with bordeaux mixture. 
Weigel and Nelson (460) tested derris and cube with various wetting 
agents (alkylphenylbenzenesulphonic acid, sulphonated castor oil, ammonium 
caseinate plus rosin residue emulsion, etc.) for the control of the common 
