HEAOLES, T. J. (2158) 
1930. A MUCH CHEAPER TREATMENT FOR DESTROYING PLANT LICE. N. J. State 
Hort. Soc. Proc. Ann. Meeting 1929; 179-182. [Abstract in Biol. Abs. 
5(3): 859. Entry 8,559. 1931.] 
Conditioning aqueous solutions of nicotine "by addition of 0.5 
percent sodium or potassium oleate soap resulted in destruction of 
common plant lice with a concentration of actual nicotine approxi- 
mately l/4 that necessary without this conditioning. The change 
leads to a reduction in the surface tension of aqueous solutions of 
nicotine and in the interfacial tension existing "between these 
solutions and the integument of plant lice. It thus "becomes pos- 
sible to cover the insect's "body quickly with a thin layer of an 
aqueous nicotine solution "fhich secures entry to the "breahing system, 
"bringing the nicotine in direct contact with the internal tissues. 
MOZNETTE, G-. p. (2159) 
1930. HOT? SOME FACTORS LIMIT EFFORTS FOR ARTIFICIAL CONTROL OF THE 
PECAN NUT CASE-BEARER IN THE SOUTHEAST. Natl. Pecan ^ssoc. Bull. 
4(1): 40-43, Mobile, Ala. [Abstract in Rev. Appl. Ent. (A) 19: 503. 
1931.] 
If the eggs of the above insect ( Acrobasis c ary ae G-rote) are 
coated with certain contact sprays, the embryo may be killed either 
by desiccation, by cutting off the supply of oxygen, or by physically 
preventing the emergence of the larva. Such sprays as nicotine or 
certain white oils, however, which kill the eggs when applied at 
definite strengths, are at present too expensive for general recom- 
mendation where many applications are necessary. The newly hatched 
larva is likely to die if made to crawl over clusters of small nuts 
recently coated with nicotine sulphate or pyrethrum extract. 
O'KANE, 7. C, TJESTGATS, T7. A., GLOVER, L. C, end L0T7RY, p. R. (2150) 
1930. SURFACE TENSION, SURFACE ACTIVITY, AND UETTING ABILITY AS FACTORS 
IN THE PERFORMANCE OF CONTACT INSECTICIDES. N. H. Agr. Expt. Sta. 
Tech. Bull. 39, 44 pp . , illus . 
Ionization, as of nicotine, may affect toxicity through 
alteration of surface activity and adsorption. Nicotine at successive 
concentrations exhibits evidence of the effects of increased molecular 
concentration at interfaces (pp. 2-3). 
PORTIER, p. (2151) 
1930. SYMPTOMS OF NICOTINE POISONING IN LEPIDOPTERA. Compt. Rend. Soc. 
Biol. 105 (30): 367-359. [in French. Abstract in Rev. Appl. Ent. (A) 
19: 123- 1931.] 
