Table 2.--Mortality of test insects in type A (semiclosed) tobacco warehouses 
treated with DDVP aerosols 
3 : Mortality-= : Mortality-- 
: Exposure period : exposed in free : inserted in to 
Amount of DDVP : ; air space : bacco hogsheads 
applied : Started : : H 3 $ 
: after : Length : Adults : Eggs : Adults : Larvae 
streatment: 3 : 2 3 
: Hours Hours Percent Percent Percent Percent 
2 
1 gram per 1,000 : 
cubic feet ..e : 0 2h 0 1 
‘ L8 3 7 
$ 72 5 6 
: 16 hi 100 67 
: 12 100 73 
: 18 100 62 
: 2h 100 61 
: 168 2h 3 
3 
2el grams per 1,000: 
cubic feet « ee : 0 2h 0 8 
3 8 0 9 
3 72 0 h 
3 16 h 100 73 
12 100 75 
18 100 6h 
2h 100 78 
: 168 2h 65 
2 
4.25 grams per : 
1,000 cubic feet : 0 2h 1 6 
2 8 at 5 
$ 72 1 8 
: 16 h 100 8 
t 12 100 79 
: 18 100 77 
3 2h 100 82 
: 168 2h 83 
2 
Controls { = -- 0 78 i! 5 
2 
