12 
39. The Natural Enemies of the Citrus Aphid (Aphis spiraecola 
Patch) in Florida. (10 min.) F. R. Cole, Orlando, Fla. 
Statement of importance of pest and control by insect enemies (of three orders), all 
predators. 
40. The Citrus Aphid Outlook. (10 min.) (Lantern.) A. C. Baker, 
Washington, D. C. 
In the spring of 1924 there occurred in Florida an epidemic of an aphid on citrus. 
Transfer tests have proved the species concerned to be Aphis spiraecola Patch. A 
correlation between the growth of the epidemic and climatic conditions has indi¬ 
cated that the epidemic may in great part be laid to these conditions. 
41. Notes on Applied Entomology in Spain with Special Reference 
to the Mediterranean Fruit Fly (Ceratitis capitata Wied.). (10 min.) 
(Lantern.) M. D. Leonard, Ridgewood, N. J. 
42. The Value of the Dry Substitutes for Liquid Lime Sulphur as a 
Control for San Jose Scale. (10 min.) (Lantern.) J. J. Culver, Vienna, Va. 
Presents results of three years’ work against San Jose scale. 
43. San Jose Scale Control with Lubricating Oil Emulsion on Peach 
Trees in the South. (10 min.) C. H. Alden, Fort Valley, Ga. 
Program 
Friday Afternoon Session , January 2 , IQ 25 , 1:30 
Gymnasium , Central High School 
READING OF PAPERS 
Insecticides 
44. A Method of Computing the Effectiveness of an Insecticide. 
(10 min.) (Lantern.) W. S. Abbott, Vienna, Va. 
A formula is proposed for obtaining a figure called “percent control” by means of 
which a series of results based on different checks may be compared. 
45. An Investigation of Sulfur as an Insecticide. (7 min.) Albert 
Hartzell, Yonkers, N. Y. and F. H. Lathrop. 
A preliminary study of the toxicity of sulfur with special reference to the solvent 
action of lime sulfur on San Jose scale. 
46. Fish Oil—An Efficient Adhesive in Arsenate of Lead Sprays, 
and Results with Other Substances Used. (10 min.) (Lantern.) C. E. 
Hood, Melrose Highlands, Mass. 
A brief discussion of the different substances used, and the comparison of each as to 
adhesive qualities. These experiments were conducted at Melrose Highlands and 
Saugus, Mass., and Somerville, N. J. 
47. The Dipyridyls as Contact Insecticides. (10 min.) (Lantern.) 
C. H. Richardson, Washington, D. C. 
