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GUIS WOLD, G. H. (2109) 
1927. THE CONTROL OF APHIDS OH HOUSE PLANTS. Cornell Est, Bull. 162, 
15 pp., illus. [Abstract in Rev. Appl, Ent. (a) 16; 40b. 1928.] 
a solution of 1/4 teaspoonful nicotine sulphate and l/4 oz. 
soap to 1 qt. water has proved very successful for dipping the plants 
or as a spray. After treatment the plants should be placed on their 
•• .sides to drain and on the following day they should oe dipped in 
clear water or sprayed with it to wash off the insecticide. The 
simplest remedy is a 2 percent free nicotine dust which kills 90 
to. 100 percent v/ithin a short time. The plants "before treatment 
should be covered with a cloth thrown over small 'Stakes driven 
into the soil, the hand duster being inserted under the cloth so 
that the dust will reach the lower surface of the leaves. The 
cloth may be removed in 10 or 15 minutes when the dust will all 
have settled on the plants. 
KELLERMANN , W. ■ (2110) 
1927. SGHADLINGSBEKAMPITOG IN H0SMHAUS1RN. Gartenwelt 31: 258-259. 
Various insecticides with a nicotine base are used as spray 
or fumigant against aphids. In case of fumigation the aphids 
.often' fall to the ground where they recover. It is therefore- 
customary in certain florists' establishments to spray the plants 
and to wash the floor with a soap solution of 1.5 kg. soft soap 
and 1 1. alcohol in 100 1. water. 
THEOBALD, E. V. (2111) 
1927. CATERPILLARS AM) PLAHT LICE ATTACKING CHRYSANTHEMUMS UNDER GLASS. 
Jour. So. East. Agr. Coll. Wye , No. 24, pp. 44-50, illus. [Kent] 
[Abstract in Rev. Appl. Ent. (A) 15: 578.- 1927.] 
"Several species of aphids are enumerated. If the houses are 
not too wide the plants should be sprayed with nicotine and soft 
soap otfore they flower; when they are in flower it is best to fumi- 
gate at intervals with tobacco shreds. 
HULSEN3EEG (2112) 
1928. EXPERIMENTS WITH CaLCTUM CYANIDE EOR THE CONTROL OE GREENHOUSE 
PESTS. Ztschr. Angew. Ent. 14 (2): 285-315, illus. [in German. 
Abstract in Rev. Appl. Ent, (a) 17: 206. 1929.] 
In some cases the value of cyanide fumigation in greenhouses 
"is greatly increased if it is followed ~oy nicotine fumigation, 
using a comparatively low concentration of the latter. 
