* 
THE BLACK FLY OF CITRUS. 53 
The black fly can be controlled by contact insecticides. Five and 
ten per cent kerosene emulsions, fish-oil soap at the rate of 1 pound 
to 2 and to 4 gallons of water, and nicotine oleate have given good 
results. 
There is a possibility that this insect may gain entrance into and 
become established in the United States, particularly Florida. It 
already occurs in Cuba and Nassau, New Providence. The way in 
which it is most apt to be introduced and become established is 
through infested food plants, such as nursery stock or individual 
plants, or as cuttings for propagation. This is the way in which it 
was brought from the Old World to the New and is the way in which 
it is continuing its spread to widely separated parts of its new home. 
LITERATURE CITED. 
(1) Arango, Rodolfo. 
1919. La mosca prieta. In Algunas plagas de nuestros cultivos. Oficina 
de Sanidad Vegetal (Cuba) Boletin no. 2, p. 47-54, 5 figs. 
(2) Ashby, S. F. 
1915. Report op the Microbiologist. In Ann. Rept. Dept. Agr. Jamaica 
for year ended Mar. 31. 1915, p. 29-31. 
(3) 
1915. Notes on diseases op cultivated crops observed in 1913-14. In 
Bui. Dept. Agr. Jamaica, n. s., v. 2, no. 8, August, p. 299-327. 
(4) Ballou, H. A. 
1918. Summary op entomological information during 1918. In Agr. 
News, v. 17, no. 434, December 14, p. 394-395. 
(5) Bragdon, K. E. 
1918. Department op port and railroad inspection. Report for the 
quarter ending March 31, 1918. In Quarterly Bull. Fla. State Plant 
Bd., v. 2, no. 3, April, p. 150-151. 
(6) Canal Record. 
1912. Ancon hospital gardens. In Canal Record, v. 5, No. 49, July 31, 
p. 394. 
(7) Cardin, P. 
1916. Una neuva plaga de los citrus en Cuba. In Mem. Soc. Cubana 
Hist. Nat. "Felipe Poey" Habana, v. 2, no. 1 (January and February), 
p. 39-42. 
(8) 
1917. La mosca prieta y medios para combatirla. Comision de Sanidad 
Vegetal Circular no. 1. Segunda edicion aumentada. January, p. 
1-10, Plates I-VIII. 
(9) 
1917. The black ply and methods op controlling it. In Agriculture: 
A monthly review dedicated to agricultural extension, animal husbandry, 
and rural progress, Secretaria de Agricultura, Comercio y Trabajo, Cuba, 
v. 1, no. 5, May, p. 43-49, 3 pi. 
(10) 
1917. Letter to J. R. Johnston, dated July 24, 1916. In Comision de Sani- 
dad Vegetal (Cuba) Boletin no. 1, April. Engl, ed., p. 67; Span, ed., p. 70. 
(11) 
1918. Sobre la mosca prieta. In Revista de Agricultura, Comercio y 
Trabajo, Organo Oficial, March, v. 1, no. 3, p. 128-130, 2 text figs. 
