ERADICATING THE COMMON BARBERRY 
17 
applied in a concentrated form would kill a bush, the field trans- 
portation costs would be low. Therefore, the chemical was applied 
in various dilutions. 
Table 2. — Summary of treatments of individual, marked barberry bushes 
with sodium arsenite 
Quan- 
tity of 
Dilu- 
Date of 
treat- 
Date of 
final ob- 
basic 
solu- 
tion, ba- 
sic solu- 
Method of appli- 
cation 
Bushes cut 
off or left 
Location 
of area 
Bushes 
treated 
Bushes 
killed 
Per- 
centage 
ment 
servation tion > 
to the 
! bush 
tion to 
water 
standing 
killed 
1922 
1923 
Pint 
Apr. 20 
June 27 
0.2 
None. 
In circle' of 1- 
foot radius. 
Standing.. 
Marshall, 
Wis. 
5 
4 
80 
Do.- 
...do 
.3 
1 to 1 
do - 
do 
do 
5 


Do... 
...do 
.3 
1 to 2 
do — . 
do 
do 
5 
2 
40 
Do... 
...do 
.3 
1 to 4 
do .— 
do 
do 
5 
3 
60 
Do... 
...do 
.2 
1 to 8 
do — . 
do 
do 
5 
3 
60 
Do... 
...do 
.2 
1 to 12 do 
do- — 
do 
5 
3 
6f> 
Do... 
...do 
.2 
1 to 16 
do 
do 
do 
5 
1 
20 
Do... 
...do 
.3 
None. 
In circle of 2- 
foot radius. 
do 
do 
5 
1 
20 
Do... 
...do 
.3 
1 to 1 
do — . 
do 
do 
5 
o 

Do... 
...do 
.3 
1 to 2 
do 
do 
do 
5 


Do... 
...do 
.3 
1 to 4 
do 
do 
......do 
5 
5 
100 
Do... 
...do 
.2 
1 to 8 
do 
do 
do 
5 
2 
40 
Do do 
.2 
1 to 12 
do 
do 
..—do— 
5 
2 
40 
Do... 
...do 
.2 
1 to 16 
do 
do 
do 
5 
1 
20 
Do... 
...do 
.2 
1 to 20 
do 
do 
do 
5 
1 
20 
May 20 
July 3 
.4 
1 to 10 
Drench 
do 
i Gurnee, 
111. 
do 
15 
14 
93 
Apr. 28 
—do 
.4 
1 to 20 
do 
do 
20 
20 
100 
Do... 
...do 
.4 
1 to 20 
do — 
Cut off- 
do 
20 
20 
100 
Apr. 18 
June 27 
.4 
1 to 40 
do 
Standing. . 
Marshall, 
Wis. 
20 
20 
100 
Total. 
150 
102 
68 
1 ~ " 
i A commercial product known as an "8-pound" sodium -arsenite solution was used. 
When applied in a circle around the bush it appeared that dilu- 
tions of from 1 to 4 to 1 to 12 were the most effective. However, 
this method was not so effective when applied as a drench, and a 1 
to 20 solution was more effective than a 1 to 10 solution in the latter 
method. The results indicated that the chemical must be applied to 
the soil immediately around all shoots and that sufficient solution 
must be used to insure that all roots in that location would be reached. 
They also indicated that while a concentrated solution killed por- 
tions of the plant, it was not absorbed in sufficient quantity to kill 
all parts of a plant. Therefore, it was concluded that a dilute 
solution was more effective than a concentrated one. Taking all this 
into consideration, a drench consisting of 0.4 pint of " 8-pound " 
sodium-arsenite solution in 2 gallons of water was decided upon for 
further experimentation. 
AEEA TREATMENTS 
Xear Holland, Ohio, about 10 miles west of Toledo, is a large 
stone quarry. The company operating this owns considerable land 
adjacent to the present quarry. Most of this land is not cultivated 
and has grown up to brush and small trees, including many escaped 
barberry bushes. The soil varies from a sand} 7, loam to gravel under- 
lain at a depth of a few inches to several feet by sandstone. Two 
soil analyses showed the surface soil to be slightly alkaline (P H 7.5). 
4197—26 3 
