October, *18] 
WALTER: COCKROACH CONTROL 
425 
and mentions having killed many roaches with this material. Since 
that time powdered borax and powdered sugar, mixed in equal parts, 
have often been recommended, possibly more than any other materials, 
since these are nonpoisonous to human beings. Powdered borax and 
powdered sugar were first used at the cafeteria but gave no relief and no 
dead roaches were observed after using. 
Traps were used at the same time as the borax. These were made by 
inserting a paper cone, tipped with hair, into a flat bottom flask. 
The flask was laid on its side, using banana peeling as bait within. 
This differs from the Graham roach trap described by Washburn, 1 
since it has only a single cone with a row of bristles at the small end. 
The Graham trap has a double cone with bristles on the small end of 
the inner cone. 
Two traps were placed beneath the steam-heated serving table in the 
cafeteria. Trap No. 1 was in a place where diffused light from a 
window would strike it by day and indirect artificial light would strike 
it in the early part of the night. Trap No. 2 was in the dark day and 
night. Other conditions, so far as observed, were equal. Collections 
were made from the traps at ten o’clock each morning. The hair on 
the cones did not entirely prevent the escape of the roaches and, as they 
avoid light, the wide difference in results may be partly explained in 
this way. Most of the roaches caught here were Blatetta germanica 
although Blatta orientalis seemed to be fully as abundant in the building. 
Table No. 1. Cockroach Traps in Cafeteria 
Trap No. 1 (In light) Trap No. 2 (In dark) 
Date 
Adults 
Nymphs 
Adults 
Nymphs 
June 9 
3 
1 
1 
28 
June 10-11 
0 
0 
7 
108 
June 12 
0 
4 
3 
96 
June 13 
4 
18 
15 
133 
June 14 
0 
26 
3 
111 
June 15 
0 
49 
7 
87 
June 16 
0 
18 
1 
63 
June 17-18 
0 
203 
4 
279 
June 19 
1 
39 
2 
167 
June 20 
0 
15 
1 
100 
June 21 
0 
32 
0 
331 
13 days 
8 
405 
44 
1,503 
While the traps were being used a new manager took charge of the 
cafeteria. When he saw conditions this new manager wrote to an 
agent of a roach poison company who guaranteed to rid the place 
entirely in’thirty days. Arrangements were made for the employment 
1 Journal of Economic Entomology, vol. 6, p. 327, 1913. 
