SB 
818 
C578 
ENT 
CIRCULAR No. 57. 
United States Department of Agriculture, 
BUREAU OF ENTOMOLOGY. 
L. O. HOWARD, Entomologist. 
THE GREENHOUSE WHITE FLY. 
(Aleyrodes vaporariorum Westw.) 
By A. W. Morritt, 
Special Field Agent. 
The damage by the greenhouse white fly to tomato, cucumber, and 
many other plants growing under glass easily places it in the front 
rank of greenhouse pests. In many cases it would be impossible to 
grow certain crops in forcing houses without the aid of remedial 
measures. <A specific instance is on record where, in a western Massa- 
chusetts town, the attacks of this insect resulted in the total loss of a 
greenhouse crop of tomatoes and cucumbers valued at $4,000. 
Fic. 1.—Aleyrodes vaporariorum: a, egg; b, young larva; c, pupa, top view; d, pupa, side view; 
e, adult—c, d, e, about 25 times natural size; a, b, still more enlarged (a-d, after Morrill, Tech. Bul. 
Mass. Exp. Sta.; e, original). 
20127 —05 , 
