36 
BULLETIN 1451, U. S. DEPARTMENT OF AGRICULTURE 
all seasons of the year. An examination of the results given in Table 
13 shows that when only one-half gallon of gasoline was used per 
bush about 19 per cent of the bushes were not entirely killed. Even 
with an application of 1 gallon per bush 3 per cent lived. 
Merely from the standpoint of effectiveness gasoline was very 
satisfactory. No doubt a slightly larger application would be 100 ! 
per cent effective, but considering cost, even an application of 1 gal- 
lon per bush was too expensive. Other chemicals were much cheaper 
and were equally as available as well as more effective. 
KEROSENE 
Kerosene was tried on potted barberries growing in the greenhouse. 
Doses as large as 42 cubic centimeters applied to the surface of the 
soil in 8-inch pots failed to cause appreciable injury to the barberries 
growing therein. This dose was estimated to be the equivalent of 
about 1 gallon applied to a bush in the field. This result was sur- 
prising, because kerosene has been much used as a herbicide and is- 
known to be very injurious to many plants. 
Had it not been for the fact that J. W. Baringer, associate path- 
ologist in the Bureau of Plant Industry, United States Department 
of Agriculture, in charge of the barberry-eradication campaign in 
Ohio, reported an instance where barberries which he had treated 
with kerosene were dead the following year, experiments with either 
kerosene or gasoline might not have been continued. A number of 
field treatments were made, with the results noted in Table 14. 
Table 14.- 
-Summary of treatments of individual, marked barberry bushes with 
kerosene 
Date of 
treatment 
Date of final 
observation 
I 
Quantity| \ Bushes 
of chem- ; Method of ! cut off 
ical per ! application! or left 
bush j standing 
Location of 
Bushes 
treated 
Bushes 
killed 
Per- 
centage 
killed 
Oct. 17, 
May 5, 
Julv 3, 
Aug. 10, 
Sept. 10, 
Oct. 17, 
May 5, 
July 3, 
Aug. 10, 
Sept. 10, 
Oct. 17, 
May 5, 
July 3, 
Aug. 10, 
Sept. 10, 
Oct. 17, 
May 5, 
July 3, 
Aug. 10, 
Sept. 10, 
1922 
1923 
1923 
1923 
1923 
1922 
1923 I 
1923 
1923 : 
1923 
1922 ■ 
1923 
1923 I 
1923 j 
1923 
1922 ! 
1923 
1923 
1923 
1923 
Total. 
July 15, 1924 i 
do. 
July 14,1924 
do 
do-. 
Julv 15,1924 
do 
July 14,1924 
do. 
do. 
July 15,1924 
do-. 
July 14,1924 
do. 
do. 
July 15,1924 
do.. 
July 14,1924 
do. 
do. 
Gallons 
0.5 
.5 
.5 
.5 
.5 
.5 
.5 
.5 
.5 
.5 
1.0 
1.0 
1.0 
1.0 
1.0 
1.0 
1.0 
1.0 
1.0 
1.0 
Drench. 
...do.... 
...do.... 
...do-... 
...do.... 
— do.-.. 
...do-... 
...do.... 
...do.-.. 
...do.... 
...do.... 
...do.... 
...do.-.. 
— do.... 
...do.... 
...do.... 
... do--.. 
— do-... 
— do.... 
...do.... 
J Cutoff— 
.... do 
J. ..do 
J. ..do 
-!-..do 
Standing. 
...do 
—do 
...do 
...do 
Cut off... 
...do 
...do 
...do 
...do 
Standing. 
...do 
...do 
...do 
...do 
Gurnee, 111... 
do. 
do. 
do.. 
do.. 
do. 
do 
do 
do- 
do.. 
do.. 
....do.. 
do-. 
.....do. 
.....do.- 
.....do 
do 
do.. 
do. 
.....do-. j 
.... 
100 
100 
100 
100 
109 
100 
100 
100 
100 
80 
10O 
100 
100 
100 
100 
100 
100 
100 
100 
100 
153 
152 
An examination of Table 14 shows that out of 153 bushes treated 
only 1 lived. This bush was treated in September with one-halt 
gallon of kerosene. These treatments averaged over 99 per cent 
effective, making the best showing of all the more extensive ones. 
Even salt, which is perhaps the most satisfactory chemical for kill- 
