-65- 
The most interesting fish-poison plant from an insecticidal 
viewpoint was a vine from the British Solomon Islands, which was 
indistinguishable from Derris trifoliata . Its leaves were some- 
what more toxic than the roots to the bean aphid, but they were 
less toxic than the roots of J), elliptica . — Tattersfield and co- 
workers (582) • 
Samples of Mundulea serica from Union of South Africa con- 
tained no rotenone, but tests with the bean aphid showed that the 
roots have definite insecticidal action though not sufficient to 
be of much economic value. Samples of leaves of Tephrosia vogelii 
from Uganda gave positive biological tests, having paralyzed 166 
percent of the aphids.— Imperial Institute of London (308) . 
Aphis spireacola Patch, the spirea aphid 
Potassium oleate soap was a better spreader for derris than 
potassium soap of FF wood rosin.— Fassig and Pierpont (176) . 
Aphis tavaresi Del G., an orange aphid 
Suspension of ground root of Derris elliptica , cultivated in 
Mauritius, successfully controlled this aphid on citrus when ap- 
plied at the rate of 5 pounds to 100 gallons of water.— Jepson 
(323). 
Brevicoryne brassioae (L.), the cabbage aphid 
A dust containing derris, sulfur, hydrated lime, and nicotine 
sulfate (25:37.5:37.5:5) by weight was much more effective than 
one of derris and talc with the same rotenone content, but little 
or no more effective than one of derris, talc and nicotine sulfate 
(25: 75:5) in a field experiment. Derris and Tephrosia w ere more 
effective than Loncho carpus of the same guaranteed rotenone content. 
— Arant (22, 23, 26). 
— ' ™~— 
A derris-nicotine dust, with sulfur and hydrated lime as di- 
luents, was approximately ps effective as a lime-nicotine sulfate 
dust. A common derris dust appeared to be ineffective in controlling 
the cabbage aphid, In 3-year trials it was possible to control 
both cabbage worms and aphids with a single dust containing free 
nicotine 2.5 percent, dusting sulfur 20 peroent, derris (5 percent 
of rotenone) 15 percent, and talc or hydrated lime 62.5 percent.— 
Brooks and Allen (91) j [Allen] (15) ; Wisconsin Agricultural Ex- 
periment Station (T§6, p. 65). 
