- 376 - 
of a fungicide, lead arsenate, and tobacco extract. Against the potato 
leaf hopper, Empoasca mali , bordeaux mixture proved a satisfactory re- 
pellent while nicotine sulphate and kerosene emulsion were ineffective. 
LOVETT, A. L. (1611) 
1920. INSECTICIDE INVESTIGATIONS. Ore. Agr. Expt. Sta. Bull. 169, 55 p 
illus. [Abstract in Rev. Appl. Ent. (A) 8: 372. 1920.] 
Nicotine sulphate is a powerful repellent for tent caterpillars, 
and if feeding does take place even weak solutions kill almost instantly 
It is an effective ovicide for codling moth, especially with the addi- 
tion of soap, but is not to be recommended as a substitute for the stand 
ard arsenate sprays in codling moth control. 
FEYTAUD, J. (1512) 
1921.' ESSAIS DE BUILLIES I.1IXTES POUR LE TRAITEMENT DES ARBRES PRUITIERS 
Ann. Epiphyties 7: 195-236, illus. 
The following is one of the spray mixtures recommended against 
the larvae of the codling moth CCa mooapsa pomonella L.) on apple and 
pear trees: 15 parts titrated nicotine extract, 6.6 parts copper sul- 
phate, 30 parts slaked lime, and 1,000 parts water (p. 199). A few 
eggs of the codling moth, which were treated with the above bordeaux- 
nicotine mixture, were all aborted (pp. 231-232). 
McINDOO, N. E., SIKANTON, E. L., PIANK, H. K., and FISKE, R. J. (1613) 
1921. EEEECTS OP NICOTINE SULPHATE AS AN OVICIDE AND LARVICIDS ON THE 
CODLING MOTH AND THREE OTHER INSECTS. U. S. Dept. Agr. Bull. 938, 19 
[Abstract in Rev. Appl. Ent. (A) 9: 576. 1921.] 
Nicotine sulphate (40-percent) is effective in destroying the 
fresh eggs of Bpmbyx mori , L.; in older eggs hatching is more or less 
retarded by it. Ttie exhalation from leaves dipped in the solution 1 
to 5 days previously proved fatal to newly hatched larvae, and when 
fed on the leaves 6 to 11 days after dipping, they also succumbed. 
Against eggs of the codling moth (Cydia pomonella ) nicotine 
sulphate did not prove effective, only about 20 percent of the eggs 
failing to hatch. Larvae placed on pears that had. been sprayed 1 or 
2 days previously were reduced by about 75 percent, the mortality de- 
creasing tc about 25 percent on the sixth and seventh days. Similar 
experiments carried out with eggs of Leptinotarsa decemlineata , L. 
(pota.to beetle) and H erne ro camp a leuco stigma, S. & A- (tussock moth) 
proved the inefficiency of nicotine sulphate as an ovicide in the case 
of these species. 
By chemical and histological methods it was shown that nicotine- 
sulphate spray solutions, containing soap, do not pass into the lea.ves 
sprayed, nor does the dust in the film of adhering nicotine sulphate 
enter the stomata of the leaves (p. 14 of original). 
