- 50 - 
Van der Scheer ( 259 ) in 1935 reported that rotenone-benzer.e emulsioi 
(l gm. rotenone, 20 cc, benzene, and 30 cc, visiter containing 0.1 to 0,15 
Igepon T) at a concentration of 1:5,000 gave a 100-percent kill of the bla< 
citrus aphid on tea foliage, 
Worsley (324) in 1936 reported that Mundulea suberosa Benth, bark 
(0.9 percent rotenone) from Moa district, Tanganyika Territory, East Africi 
■was even more toxic than derris root (5,4 percent rotenone) to this specie 
Concentrations, necessary to. give 100-percent kill of Toxopt cra aurantii 
were 0,06 percent for. nicotine, Q.125 percent for Mundulea bark, and 0,"l5 
percent for derris, 
Trifidaph is phascoli (Pass,) 
See report of tests made by the South Carolina Agricultural Experi- 
ment Station ( 249 ) and Rainwater (228) under Anur a phis maidi - radicis 
Forbes, p. U. 
Derris applied to the seedbed before planting, and around the plants 
hastened the germination of cotton by 24 hours, but did not control 3 
species of root aphids of v.hich T, phased i causes the most severe damage. 
United States Department "of . Agricultu"ro7*~5uroau of Entomology and Plant 
Quarantine (285) in 1939. 
Aphiidac (unidentified species) 
Aphids on apple 
Kopp ( 176 ) in 1924 reported that a spray consisting of 1 pound of 
derris powder plus 1 kg, of soap in 800 liters of water gave excellent 
results against apple aphids. 
The Michigan Agricultural Experiment Station ( 199 ) in 1925 reported 
that derris sprays had given encouraging but not conclusive results against 
various aphids on apple. 
Derris spray gives a good measure of control of aphids on apple 
trees in England. — Kearns, Marsh, and Pearce ( 168 ) in 1932, 
These insects were killed by derris dust (1 percent rotenone). — Do 
Bus ay et al . (_32) in 19 35. 
Aphids on beans 
Plant lice on lima beans, along with the Mexican bean beetle and 
mildew or pod mold, arc controlled by a rotenone preparation added to the 
bordeaux spray. — Suffolk County, N. Y,, Farm Bureau (254) in 1933, 
Aphids on birch 
Derris, l-l/2 pounds per 100 imperial gallons of water, with the 
addition of soap, was used against aphids on a cut-leaf birch but they 
did not appear to be affected during the first 12 hours. Two days later 
the tree was found to be completely free of aphids. — Kelsall et al. 
(168) in 1926. 
