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Tennessee. Derris was mentioned by practically all participating 
in the discussion. 
Silva (375) in 1935 reviewed information on rotenone, Derris 
and Loncho carpus. 
Howard, Mason and Davidson (203) in 1935 stated that "Rotenone 
dusts" on the market are either derris or cube dusts and the term is 
a misnomer. Pure rotenone is of little value in the field under 
practical conditions. 
Roark (347), at the Codling Moth Conference held February 26 
and 27, 1935, at Urbana, 111. , spoke of the results obtained with 
derris and cube for codling moth control. The maximum rotenone residue 
found on a freshly sprayed apple was 10 micrograms per square inch. 
Cube and derris have not given better results because very little has 
been put on. The decomposition of rotenone films by light was 
discussed. 
Robinson (357) in 1935, in writing on the preparation and use 
of insecticidal sprays, mentioned rotenone (from derris and cube) 
briefly. 
Fryer (156) in 1936 spoke of the need of a chemical method for 
evaluating derris and cube. 
Witten (475) in 1936 reported Win. La Varre's explorations in 
the Guianas, and in 1937 La Varre (257) himself wrote on exploring for 
profit. Mention is made of "nekku" and its use as a fish poison and 
insecticide. 
D. H. K. (231) in 1936 briefly referred to recent work of Ambrose 
and Haa_g and of Lightbody and Mathews on the toxicology of rotenone 
and extracts of derris and cube. 
G-corgi and Teik (163) in 1936 spoke of the increasing competition 
that Derris faced from other plants, notably cube root ( Loncho carpus sp.), 
possessing similar insecticidal properties. 
Roark and Busbey (354) in 1936, in a list of patented moth- 
proofing materials, referred to Canadian patent 338,896 which covers a 
chlorinated hydrocarbon extract of cube as a mothproofing composition. 
The article by Page (513) is abstracted by Crilley (101), Assistant 
Commercial Attache at Lima, Peru, in Economic and Trade Note No. 116, 
dated October 20, 1936, of the U. S. Department of Commerce, Bureau of 
Foreign and Domestic Commerce, and is also referred to in the World 
Trade Notes of that Sureau (106). 
J. Chevalier (76) in 1936 reviewed rotcnone-bearing plants. Under 
the name "Cube du Perou" are found in commerce the roots of Lonchocarpus 
violaceus («= Robinia nicou Aublet) , L. ruf esc ens Benth. and some neighbor- 
ing species. According to Spoon pnd Rowran, L. chrysophyllus contains 
rotenone. 
