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PARA-DICHLOROBENZENE AS AN INSECT FUMIGANT, 5 
Experiment 
No. and date. 
No. 1, Mar. 25, 
1914. 
No. '2, Apr. 7, 
1914. 
No. 3, Apr. 18, 
1914. 
No. 4, Apr. 28, | Tribolium confusum 
No. 5, Apr. 29, 
1914. 
No. 6, May 1, 
1914. 
No. 7, May 4, 
1914. 
No. 8, May 11, 
1914. 
No. 9, May 14, 
1914. 
No. 10, May 15, 
1914. 
No. 11, May 18, 
1914. 
Experiments with para-dichlorobenzene as a fumigant. 
Insects introduced. 
Aver- 
age 
temper- 
ature. 
Tribolium confusum 
Duv.; T.ferrugineum 
Fab.; Calandra oryza 
L.; C. granaria L.; 
Silvanus surinamen- 
sis L.;  Rhizopertha 
dominica Fab.; 
Laemophloeus mi- 
nutus Oliv.; Tenebrio 
molitor L.; Sitotroga 
cerealella Oliv.; Plo- 
dia interpunctella 
Hbn.; Ephestia 
kuehniella Zell. 
Same as in experiment 
No. 1. 
Same as in experiment 
No. 1. 
Duy.; T.ferrugineum 
Fab.; Calandra oryza 
L.; C. granaria L.; 
Silvanus surinamen- 
sis L.; Rhizopertha 
dominica Fab. ; Sito- 
troga cerealella Oliv.; 
Plodia interpunc- 
tella Hbn.; Ephestia 
kuehniella Zell.; 
(Bruchus)  Pachy- 
merus 4-maculatus 
Fab. 
1 Rat) OSS a Rt eas 
Mites on corn..:...-..-- 
Slugs, snails, sowbugs, 
millipedes, ants. 
Tribolium confusum 
Duv.; Calandra ory- 
za L.; Silvanus sur- 
inamensis L.; Sito- 
troga cerealella Oliv.; 
Plodia interpunc- 
tella Hbn.; Ephestia 
kuehniella ell.; 
Laemophloeus minu- 
tus Oliy.; Tenebrio 
molitor L. 
: ‘ 
Same as in experiment 
No. 8. 
ei le 
52 
59 
65 
81 
80 
78 
82 
86 
81 
80 
Length| Date 
e@xpo- exam- 
sure. ined. 
Hours. 
72)| Apr. 1 
96 | Apr. 13 | 8 ounces. 
96 | Apr. 25 | 8 ounces. 
24| May 5 | 2pounds 
24 | May 2 } 2 ounces. 
28 | May 5 | 2 ounces. 
36 | May 9 | 2 pounds 
24 | May 16 | 2 pounds 
24 | May 20 | 2 pounds 
20 | May 16 | 8 ounces. 
20 | May 19 | 8 ounces. 
. Para- 
dichloro- 
benzene 
used. 
1 ounce . 
None. 
None. 
100 | 100 cubic 
100 
100 
100 
100 
Per 
cent 
killed. 
All revived. Pre- 
liminary ttest. 
Temperature 
too low. Va- 
pors diffused 
very slowly. 
Eggs, larve, 
pupe, and 
adults used in 
the case of 
Ephestia kueh- 
niella and Plo- 
dia interpuno- 
tella. Capacity 
of fumigating 
box used, 7 
cubic feet. 
Allrevived. Pre- 
liminary test. 
Temperature 
toolow. Fumi 
gating box 
used, 7 cubic 
feet. 
20 | Unsatisfactory. 
Preliminary 
test. Fumigat- 
ing box used, 7 
cubic feet. 
feet 
fumigating box 
used for this 
experiment. 
5 cubic feet fumi- 
gating jar used. 
5 cubic feet fumi- 
gating jar used. 
100 cubic feet fu- 
migating box — 
used. 
100 cubic feet - 
fumigating box 
used inthis - 
experiment. 
Four. bricks 
were heated to 
a high temper- 
ature and 
placed in box 
in order to ob- 
tain higher 
| __ temperature. 
70 | Unsatisfactory. 
Temperature 
too low. 
100 | 100 cubic feet 
| space. 
100 | 100 cubic feet 
|, space. 
No. 12. May 19, 1914, 4 ounces of finely ground para-dichlorobenzene were sprinkled over pieces of 
woolen cloth and placed in a 100-cubic-foot fumigating box for a period of 24 hours, at an average tempera- 
ture of 76° F. Upon examination it was discovered that the fine crystals adhered to the lint of the wool 
but were readily brushed off with a whisk broom. After two hours’ exposure in the open air the odor of 
para-dichlorobenzene was barely perceptible. 
No. 13. May 20, 1914, a test on the germination of seed was made. One pint of Argentine corn, about 
half of which had previously sprouted, was put in a 7-inch flower pot containing 4 inches of moist fertile 
soil. The pot was then infroduced into a 100-cubic-foot fumigating box and exposed to the vapors of para- 
