- 3g - 
Childs (79) in 1935 reported cube as well as derris ineffective against 
the codling moth in Oregon. 
Cassidy and Barber (65) reported in 1935 that in plat tests cube was 
less effective (45.2 percent control) than derris (62.8 percent control) in 
controlling the following hemipterous cotton insects in Arizona: Euschistus 
imoictiventris Stal , Chlorochroa sayi Stal , Thyanta custator F. , Dysdercus 
mimulus Hussey, and Lyg us hesperus Knight. 
Feytaud and Lapparent (147) in 1935 reported favorable results against 
the Colorado potato beetle in France with a terpinolene extract of derris (or 
cube) emulsified in water. These workers prepared terpinolene extracts of 
derris and cube by macerating 8 grams of root with 100 grams terpinolene for 
3 tc 5 days. After being filtered and emulsified, this extract killed larvae 
of the Colorado potato beetle at a dilution of 1 to 19 with water. A spray of 
2 percent of this extract has been used to destroy caterpillars on tobacco, 
roses, cherries, pears and coquelicot. 
A good, emulsion is made by nixing 700 grams of the terpinolene extract 
with 300 grams of sulphated higher fatty alcohol (oleyl, lauryl, cetyl). This 
is better than sodium rosinate. Terpinolene , or essence of pine, is rich in 
iso-cineol. Emulsions of 8-10 percent strength of the terpinolene extract are 
being tried as a substitute for anthracene oil. 
Later Feytaud and Lapparent (148) reported that in laboratory tests 
against the Colorado potato beetle it was necessary to use the following 
quantities of a product containing about 16 percent of the extractives of 
derris of which 5 percent was rotenone: 100 grams per hectoliter -of water for 
young larvae, 200 grams per hectoliter of water for old larvae, 500 grams per 
hectoliter of water for adults. 
Derris extract in terpinolene is made as follows: 15 grams powdered 
derris or cube (rotenone - 5 percent) is macerated for 5 days at a temperature 
not above 30° C. in 100 grams terpinolene, then filtered and kept in a tinted 
glass flask to escape the action of light. A mixture is mad.e of derris ex- 
tract in terpinolene, 60 parts; t..rpineol, 20 pa.rts; sulphated oleyl alcohol, 
20 parts. 
Preferably the last two ingredients are mixed first and the derris ex- 
tract then added.. For use this mixture is added, to water to make a 0.5-per- 
cent emulsion. Ammonium sulphoricinate may also be used as an euulsifier. A 
0.5-percent emulsion of this applied, to fourth-stage potato beetle larvae 
killed 30 percent in 24 hours, 75 percent in 48 hours, and 100 percent in 4 
days. 
Howard and Davidson (200) in 1935 advised that derris sprays or dusts 
were the best insecticides for the control of cabbage worms in Ohio. Derris 
or cube dust containing 0.05 to 0.1 percent rotenone, applied at the rates of 
from 20 to 25 pounds per acre, gave good control of the imported cabbage worm. 
It was indicated that throe or four applications may be required, to obtain 
control in some instances. Good results were also obtained by the application 
