■ - 538 - 
Tests with aphids shored that come tars and tar oils added to 
the toxicity of the cocoarrat-oil soar) or to the soap-nicotine solution: 
Tests shored excellent value of cocoanut-oii soap as a toxic agent for 
aphids and as a spreader for nicotine . In hard raters of Kentucky it 
is necessary to use 4 parts cocoanut-tar oil spreader per 1,000 parts 
of rater. At this concentration 50-percent nicotine (1 to 3,000) gave 
commercial control of aphids in a greenhouse. 
HUTS Til,. R. (2267) 
1934. OBSERVATIONS OH THE HABITS AMD CONTROL OF GLOSSONOTUS 'CRATAEGI 
( MEMBRACIDAE ). ON PLUM AND APPLES. Jour. Econ. Ent. 27: 365- 357. 
A spray consisting of one gal. of summer oil emulsion plus 1/2 
pt. nicotine sulphate in 100 gal. of spray killed approximately 100 
percent of the nymphs, as did also a spray consisting of 1/2 pt. nicoti 
sulphate plus l/2 gal. of penetrol in 100 gal. of spray. The same oil 
sprays and nicotine dusts had practically no effect on the adults, and 
nicotine dusts did not prove effective against the nymphs. 
PARKER, XI. B. (2268) 
1934. RECENT DEVELOPMENTS OF THE VAPO BUST METHOD OP PEST CONTROL. Joul 
Econ. Ent. 27: 1036-1040. 
Nicotine may "be incorporated in either the oil or rater phase 
of this new type of insecticide. This method is patented. Nicotine 
applied by this method proved effective on thrips . 
S. NICOTINE DUSTS, 1908-1934 
1. Kinds and Early History, 1908-1924 
CHIPPLOT (2269) 
1908. INSECTES ET MALADIES. Tribune Hort. 3: 374. 
A mixture of precipitated sulphur and "Scholesing" nicotine 
is recommended in Belgium as a dust against aphids on chrysanthemum. 
MARCHAL, p. (2270) 
1913. CLYSIA A MBIGUELLA H3 . AND POLYCHRPSIS BQTRANA. SCHIFF. IN 1912. 
Ann. Sorv. Epiphyties (1912). [Paris], pp. 248-252- [In French. 
Abstract in Rev. Appl. Ent. (A) 2: 41 0-411. 1914.] 
In experiments on £,. botr?.na_ Feytaud has been able to confirm 
his previous tests regarding the remarkable aborting action of nico- 
tine on the eggs, rhich makes, it superior to other insecticides in 
vineyard practice. Lead arsenate and nicotine as preventives and 
pyrethrum and nicotine as curatives are the only substances of much 
practical value. Dusting is a less effective method than spraying. 
Kicotined sulphur and quicklime arc the best for dusting. 
