- 486 - 
DAVIDSON, T7. M. (2080) 
1930. ROTENONE A3 A CONTACT INSECTICIDE. Jour. Econ. Ent. 23: 868-874. 
[Abstract in Rev. Appl. Ent. (A) 19: 101. 1931.] 
In suspensions, rotenone proved valuable against such soft- 
bodied insects as aphids, thrips, leafhoppers, and larvae of 
Coleoptera and Lepidoptera. When freshly dispersed in water by 
dilution of an acetone solution (4 g. rotenone to 100 cc. acetone), 
rotenone is effective against Aphi s rumicis L. at a concentration 
of 1 to 200,000, or about one-fifteenth of that at which nicotine 
is effective. 
EELT, E. P., and BROMLEY, S. W. (2081) 
1930. SHADE TREE INSECTS IN 1929. Jour. Econ. Ent. 23: 137-142. 
[Abstract in Rev. Appl. Ent. (A) IS: 395. 1930.] 
Spraying with a nicotine-molasses-soap combination in 
May apparently gives excellent control of the Norway maple leaf 
stem miner ( Nepticula sericopeza Zell.). Pachypsylla celtides - 
roamma Riley and P.. celtidis - gemma Riley commonly produce galls on 
hackberry ( Celtis occidentali s) . The former is readily controlled 
with a nicotine-molasses spray applied about the middle of May and 
the latter with the same materials applied about June 10. This 
insecticide kills many adults and apparently destroys the eggs. 
PARROTT, P. J., and GLASGOW, H. (2082) 
1930. THE ROSY APHID IN RELATION TO SPRAY PRACTICES IN 1929. N.Y. 
Agr. Expt. Sta. No. 982, 32pp., illus. [Abstract in Rev. 
Appl. Ent. (A) 18: 446. 1930.] 
The lime- sulphur and nicotine sulphate spray (Rev. Appl. 
Ent. (A) 16: 459) proved preferable to any other tried for the 
control of the rosy aphid ( Anurophis roseus Baker) . If the lime- 
sulphur is used at the rate of 1 to 8 or 1 to 11, coccids and the woolly 
aphid ( Eriosoma lanigerum Hausm.) will also be controlled. 
DARLEY, M. M. (2083) 
1931. SOME COMPARATIVE TESTS WITH ROTENONE, NICOTINE AND PYRETHRUM. 
Jour. Econ. Ent. 24: 111-115. [Abstract in Rev. Appl. Ent. (A) 
19: 345. 1931.] 
Rotenone (1 to 100,000) as r contact poison in spray form, 
wa.s found to compare favorably with nicotine (1 to 10,000) and 
pyrethrins (l to 74,800), with penetrol at the same concentration 
(1 to 200) in each spray, in tests against the false cabbage 
aphid ( Aphis pseudobrassicae Davis) in the field and the spiraea 
aphid ( Aphi s spirae cola Patch) in the laboratory. 
Against adult spotted cucumber beetles ( Diabrotica duo dec i m - 
punctata F. ) and Mexican bean beetles ( Epilachna varivesti Muls.) 
