- 482 
Walnut aphid ( Chromarhi s j uglandicola Kalt.) - 2 percent nico- 
dust (p. 42). 
Slugs and snails - 5 percent nicodust (p. 48). 
RUSSELL, H. L. , and MORRISON, F. B. (2068) 
1922. HEW PAGES IN FARMING. Wis. Agr. Expt. Sta. Ann. Rept. 1920-1921. 
Bull. 339, 142 pp., illus. [Abstract in Rev. Appl. Snt. (A) 10: 
378-379.] 
Nicotine sulphate (1 to 1,000), with soap, was used against the 
cherry aphid ( Lyzus cerasi ) . Nicotine dust was of great value 
against many chewing and sucking insects, "but cannot replace the 
arsenical s against such insects as the Colorado potato beetle and 
cabbageworms (Pieris). 
PARR0TT, P. J., and GLASGOW, H. (2069) 
1923. THE INSECTICIBAL PROPERTIES OF TOBACCO DUST. Jour. Econ. Ent. 
16: 90-95. [Abstract in Rev. Appl. Ent. (A) 11: 227. 1923.] 
Ground tobacco containing 1 percent nicotine was not so effective 
as dusts containing nicotine sulphate. The fine tobacco dust was 
highly toxic against some aphids and the apple redbug (H eterocordylu s 
malinus Reut.). The rosy aphid ( Anur aphis roseus Baker) was ef- 
fectively combated with either nicotine sulphate or tobacco dust 
incorporated in lime-sulphur or sulphur-glue sprays. 
HALEY, D. E. , OLSON, 0., and EOLLWEILER, F. L. (2070) 
1925. STUDIES ON NICOTIANA RUSTICA AS A SOURCE OF NICOTINE FOR INSECT 
COrTROL. Jour. Econ. Ent. 18: 807-817. [Abstract in Rev. Appl. 
Ent. (A) 14: 76-77. 1926.] 
The rate of nicotine evolution from ground Nicotiana rustica 
plants (nicotine = 5 percent) was measured by the death rate or 
suspended animation of Aphis brassicae L. (cabbage aphid) and other 
soft-bodied insects. Addition of water to a mixture of ground 
tobacco and basic material resulted in the evolution of nicotine. 
A mixture of 5 parts tobacco, 5 parts hydrated lime, and 3 parts 
water proved a very efficient insecticide against currant worms, 
various aphids, leaf hoppers and many other insects under both 
1-boratory and field conditions (nicotine = 2 percent). Under the 
same conditions calcium oxide was not quite so efficient as hydra-ted 
lime in liberating the nicotine. 
KELSALL, A., SPITTALL, J. p., GORHAM , R. P., and WALKER, G. P. (2071) 
1926. DERRIS AS AN INSECTICIDE. Ontario Ent. Soc . 56th Ann. Rept. 1925, 
pp. 24-40. [Abstract in Rev. Appl. Ent. (A) 15: 34-36. 1927.] 
Dcrris was much more effective than nicotine sulphate at 
practical strengths against the orchard tent caterpillar ( Mala - 
cosoma americana F.). Dusting with derris 10 to 1.25 percent and 
hydrated lime gave 100 percent control on all plots against larvae 
