- 494 - 
"Sowbugs" or "pillbugs" - use tobacco dust as a repellent, and 
spray with kerosene nicotine oleate under tenches and on walks (p. 74) 
Earth. /orms - tobacco dust worked into soil will prove effective 
(p. ?5). 
DOOLITTLE, S. P. (2105) 
1S24. CONTROL Ci CUCUivJBER i.OSaIu IN THE GREENHOUSE. U. S. Dept. Agr. 
Dept. Circ. 321, 5 pp. , illus. [Abstract in Rev. Appl. Ent. 
(A) 13: 274-275. 1925.] 
lor the control of insects transmitting cucumber mosaic ( - 
particularly the melon aphis, ^jhis > c ;oss,ypij Glov. , and the striped 
cucumber beetle, Diabrotica vittata I',,) it is axlvisa-ble to fumi- 
gate the greenhouse at intervals of 10 days through the growing 
season. Tobacco dust, nicotine pi'.per, or hydrocyanic acid give good 
re sal t s . 
GUBA, E. P. (2106) 
1926. INJURY TO GLASSHOUSE PLANTS FROw HYDROCYANIC ACID GaS FOLLOWING 
THE APPLICATION OP COPPER FUNGICIDES. Phytopath. 16 (9); 633-634. 
[Abstract in Rev. Appl. Er.t. (A) 15: 3. 1927.] 
Tobacco fumigants should be used instead of cyanide. 
ZOPPIG, P. (2107) 
1926. PESTS AMD DISEASES OF CYCLAMENS AND THEIR CONTROL, Kranke Pilanze 
3 (11) : 202-205. [in German. Abstract in Rev. Appl. Ent. 
(A) 16: 54. 1927.] 
If the plants are not in flower, a,phids and thrips may be 
destroyed by dipping in a decoction of tooacco; otherwise the green- 
houses should be fumigated with toba,cco. 
DELGADO DE TORRES, D. (2108) 
1927. EXPERIMENTS Oh THE aCTION OP NICOTINE ON INSECTS AND ITS USE 
IN HOTHOUSES AS Ail INSECTrCIDE. Bol. Pat. Veg. Ent. Agr. 2 (3-9): 
113-120. [Abstract in Rev. Appl. Er.t. 16: 577. 1928.] 
A brief survey is given of the methods of using nicotine against 
insects. A dust containing 12.5 percent -nicotine burnt in a. 
greenhouse at the ra.te of 0.215 g. of pure nicotine per cubic 
meter killed lviaerosiphum sanborni Gill, but './as only partially 
satisfactory against Ke lio t hrips fern oral is R^ut. and Trialeurodes 
vaporari orum westw. Tae fatal dose lor the turips was twice tha.t 
required for the aphid. Pseudococcus c itri Risso and larvae of 
Le.jidoptera. are very resistant to nicotine. Tne experiments in 
greenhouse fumigation were made in the United States. 
