7- 
Table 2. --Average number of tobacco moths taken in 
suction light traps in unscreened and partly screened, 
open-type warehouses, 16 sprayed weekly with pyreth- 
rum in oil and 16 untreated. Richmond, Va., 1946 
Trapping period, 
week ending — 
Unsprayed 
Sprayed 
June 
5 
2,019-* 
2,444 ±/ 
12 
1,565 
519 
19 
1,183 
131 
26 
630 
82 
July 
3 
260 
35 
10 
205 
150 
17 
335 
173 
24 
912 
259 
31 
2,095 
632 
Aug. 
7 
3,127 
446 
14 
2,978 
544 
21 
3,862 
788 
28 
2,139 
268 
Sept. 
4 
1,248 
367 
11 
660 
67 
18 
695 
71 
25 
1,088 
104 
Oct. 
2 
645 
43 
9 
248 
10 
Weekly average 
June 19 to Octobe 
r 9 1,312 
245 
1/ Catch for weeks prior to first application on June 16 
not included in the average. 
