ERADICATING THE COMMON BARBERRY 
25 
kill small barberries growing in 8-inch pots in eight days when 
sprinkled on the surface of the soil. As this chemical could be pur- 
chased for 7 to 8 cents a pound, the results seemed to warrant extend- 
ing the experiments to the field. Table 4 contains the field results. 
Table 4. 
-Summary of treatments of individual, marked barberry bushes with 
sodium dichr ornate 
u\ 
T3 
T3 
,2 
•O 52 
o 3 : 
Bushes 
1 
•a 
M 
Date of 
Date of final 
o u 1 Condition of 
Method of 
cut off 
Location 
<D 
p3 
treatment 
observation 
i?S : chemical 
application 
or left 
of area 
•+J 
M 
CO 
'+>— i i 
standing 
8 
s 
1 
PI c3 
.a 
A 
(33 O 1 
a 1 
3 
3 
CO 

PQ 
m 
Ah 
Lbs. 
Apr. 18, 1922 
June 27,1923 
1. j Dry crystals . 
6 inches deep in 
circle of 1-foot 
radius. 
Cutoff... 
Marshall, 
Wis. 
20 
6 
30 
Do 
do 
1.0 
do 
do... 
Standing. 
...do 
20 
12 
60 
Apr. 20, 1922 
do 
1.0 
do 
2 inches deep in 
circle of 1-foot 
radius. 
...do 
...do 
5 
1 
20 
Do 
do 
1.0 1 do 
j 
2 inches deep in 
circle of 2-foot 
radius. 
—do 
...do 
5 
2 
40 
May 20, 1922 
July 3, 1923 
1.5 do 
Scattered on sur- 
face among 
shoots. 
...do 
Gurnee, 
111. 
10 
8 
80 
May 5,1923 
Aug. 15,1924 
.2 I Dissolved in 
Drench 
Cutoff- 
...do 
10 


1 gallon of 
water. 
Do 
do 
.2 do 
do 
Standing. 
...do 
10 


Oct, 17,1922 
July 15,1924 
.4 do...... 
do... 
Cut off- . 
...do 
8 
4 
50 
Do 
do 
.4 1 do 
do 
Standing. 
...do 
8 
8 
100 
May 5,1923 
Aug. 15,1924 
.4 Dissolved in 
2 gallons of 
water. 
do 
Cutoff... 
...do 
10 


Do 
do 
.4 do 
do 
Standing- 
...do 
10 


Aug. 10, 1923 
do 
.5 
Dissolved in 
1 gallon of 
water. 
do 
Cut off- 
...do 
8 
7 
88 
Do , 
do 
.5 
do 
do 
Standing. 
—do 
8 
5 
62 
Sept. 10, 1923 
do 
.5 
do 
do 
Cutoff... 
...do 
10 
10 
100 
Do 
do 
.5 
do 
do.- 
Standing- 
...do 
10 
ie 
100 
Oct. 17,1922 
July 15,1924 
.8 
Dissolved in 
2 gallons of 
water. 
do 
Cut off- . 
...do 
8 
7 
88 
Do.:.... 
do 
.8 
do 
do... 
Standing- 
...do 
10 
10 
100 
July 3,1923 
Aug. 15,1924 
1.0 
Dissolved in 
1 gallon of 
water. 
do.-- 
Cut off... 
...do— 
10 
10 
100 
Do 
do..:.... 
1.0 
do 
do 
Standing- 
...do 
10 
10 
100 
Sept. 10, 1923 
do.. 
1.0 
do 
do 
Cut off- . 
...do 
10 
10 
100 
Do 
do 
1.0 
....Ido 
do 
Standing. 
...do 
10 
10 
100 
Total.. 
210 
130 
62 
The , first conclusion reached from the experiments reported in 
Table 4 was that dry sodium dichromate applied in a ring around 
the base of a barberry bush was relatively ineffective. The second 
conclusion was that the application of dry crystals of the chemical 
directly to the ground in and around the base of the shoots was not 
satisfactory. However, this is open to question, as bushes of but one 
series were so treated. The decision was somewhat influenced by the 
results obtained with sodium arsenite, as reported elsewhere in this 
bulletin, and hence attention was turned to the use of sodium dichro- 
mate in solution. Doses from 0.2 to 1 pound of the chemical dis- 
solved in 1 or 2 gallons of water were tried. The results show that 
all bushes which received a drench of 1 pound dissolved in 1 gallon 
