- 487 - 
pyrethrins (1 to 37,400) were effective, whereas nicotine (1 to 
5,000) and rotenone (l to 50,000) were ineffective, with penetrol 
(1 to 100) in each spray. 
The relative toxicity of rotenone to the red spider (Tetr anychus 
telarius L.) as compared with the toxicity of nicotine and pyrethrins, 
is appreciably greater than its relative toxicity as indicated in 
the aphid test. 
FELT, E. P., and BROMLEY, S. ff. (2084) 
1931. INSECTICIDE DIVE ST I GAT IONS DURING 1930. Jour. Econ. Ent. 24: 
232-240. [Abstract in Rev. Appl. Ent. (A) 19: 355-356. 1931.] 
Molasses nicotine soap sprays, which have proved effective in 
the control of the hackberry leaf gall psyllid (Pachypsylla ce lti - 
di s mamma Riley) , the hackberry bud gall psyllid (P. c eltidi s- gemma 
Riley), the maple Nepticula ( Nepticula s ericopeza Zell.), and oak 
red spider (P aratetranychus bicolor Banks) were applied with safety 
to a series of 13 species of trees at a molasses dilution of 1 to 
20. A series of sprays and dusts w«s tested for the control of 
the chinch bug ( Blis sus leucop terus Say) , with potassium oleate plus 
nicotine appearing the most promising. 
QUAINTANCE, A. L. , and SIEGLSR, E. H. (2085) 
1931. INSECTICIDES, EQUIPMENT, AND METHODS FOR CONTROLLING ORCHARD INSECT 
PESTS. U. S. Dept. Agr. Farmers' Bull, 1666, 92 pp., illus. 
Nicotine is briefly discussed (pp. 6, 24, 25, 59, 61, 66, 69, 
70, 72, 75, 82, 84, 86, 89), but the information given is very 
similar to that stated by the same authors in 1918 (Ref. 2066), with 
the following exceptions: Nicotine dust is briefly described (p. 25). 
The apple aphids are A nuraphis ro seus Baker, Aphis pomi DeG. , and 
Rhopalosiphum prunifcliae Fitch (p. 66). .The eye-spotted bud moth 
( Spilo nota oce liana Schiff.) is a new addition to the list of insects 
controlled by nicotine (p. 69). Other minor changes in regard to 
generic names are also to be noted (pp. 83, 85). 
SMITH, E. M. (2086) 
1931. A TEXTBOOK OF AGRICULTURAL ENTOMOLOGY. Cambridge, 235 pp., 
illus. 
Nicotine, in one form or another, is recommended against the 
following insects: Aphids (pp. 50, 60, 63, 66, 259); diamond-back 
moth, Plutella maculipennis Curtis (p. 91); asparagus beetle, 
Crioceris asparagi Linn, (p. 113); various flea beetles (p. 120); 
and various species of flies (pp. 202, 203, 222, 227, 234). 
JACQUES, C. , (2087) 
1932. ENEMIES OF COCONUT PALMS IN NEW CALEDONIA. Rev. Agr. Nouvelle- 
Caledonie, p. 903-909, illus. [In French. Abstract in 
Rev. Appl. Ent. (A) 21: 150. 1933.] 
