- 82 - 
Experiments performed in 1937 at South Point, Ohio, against Ee ilachna 
varivestis Muls. by N. P. Howard and H. C. Iv:ar,on, (202) of the. Columbus, Ohio, 
laboratory, gave the following results with the various insecticides tested: 
Phenothiazine at 2 pounds to 50 gallons of water gave good control, but 
slight plant injury resulted; derris, cube, timbo, and devil's shoestring 
gave good control at a concentration of 0.015 percent rotenone and usually 
at concentration of 0.01 percent rotenone. While the use of a varnish 
sticker with derris and cube increased the degree of control in one instance, 
no increase could be noted in two other experiments. The use of sulphur 
with derris or cube sprays, and its use as a diluent with dust mixtures of 
these materials, does not consistently result in improved control in Ohio; 
however, its use farther east usually results in better bean crops. 
Wilcox and Stone (468), in March 1938, reported that cube dust 
mixtures containing as high as 2 percent rotenone have given inferior results 
and are not recommended for use against the tomato fruit worm, Heliothi s 
obsoleta F. ' 
Johns-Manville (218), in April 1938, called attention to Celite 209, 
an amorphous silica which on account of its fineness (essentially below 10 
microns particle size) and its lightness (3 pounds per cubic foot) is useful 
as a diluent for insecticides, especially powdered derris, cube, and 
pyre thrum. 
LIST OF INSECTS MENTIONED 
Insects mentioned in this review against which cube has been tested 
or recommended are listed as follows: 
A list of insects against which cube has been tested. 
Insect 
(Euvanessa) Aglais antiopa L. 
Alabama argil lace a Hbn. 
Result 
Effective 
Equal to derris 
(76$ control) 
Ineffective 
Reference 
Hamilton 185 
Smith and Soales 382 
Wille et al. 471 
Alfalfa looper 
Alsophila pometaria Harris 
Anasa tristis DeG-eer 
Less effective 
than calcium 
arsenate 
Ineffective 
Less effective 
than derris 
Effective against 
nymph s 
Smith and Scales 382, 
383 
Colo. Agr. Expt. Sta. 
87 
Felt and Bromley 144 
Idaho Agr. Expt. Sta. 
210 
