18 BULLETIN 1451, U. S. DEPAKTMENT OF AGRICULTURE 
On August 16 and 17, 1922, 364 mid-sized to very large barberry 
bushes in this area were treated with a dilute sodium- arsenite solu- 
tion. The solution was made by mixing 1 gallon of " 8-pound " 
sodium arsenite in a barrel with about 40 gallons of water. The 
water was hauled to the field in barrels on a light truck and the 
mixing was done as near the barberries as practicable. The solution 
was then carried to the bushes in 10-quart pails and poured among 
the shoots and around the bases of the plants. An effort was made 
to wet the base of every shoot and also the ground for a distance of 
about a foot around each shoot. At the time the treatment was 
made the weather was hot and the ground was very dry, so that the 
solution was absorbed rapidly. The cost items are as follows : 
Sodium arsenite (" 8-pound"), 18 gallons at $1 $18.00 
Labor, 36^ man-hours at 50 cents 18. 25 
Truck 5.00 
Total cost 41.25 
Number of bushes treated 364 
Sodium arsenite per bush pint 0.4 
Cost per bush $0,113 
This property was inspected September 26, 1922. The leaves of 
nearly all the treated bushes were brown and falling, though there 
were a few green leaves remaining on some. The inner bark and 
outer layers of wood on the treated bushes were brown instead of 
the normal yellow color, and there was a slight odor as of decayed 
wood around the bushes. The grass around the treated bushes was 
dead to a distance of 2 or 3 feet (pi. 10, A). It was evident that 
some bushes had been missed when the treatment was made. That 
they had not received any arsenic was shown not only by their 
healthy condition but by the grass and weeds growing near them. 
The property was inspected again in the summer of 1923. By 
this time nearly all of the treated bushes were dead (pi. 6, B). Two 
or three had a few green shoots and would survive. 
This experiment appears to have been nearly 100 per cent ef- 
fective, so far as bushes actually treated are concerned. It empha- 
sizes the necessity of taking special precautions in order to avoid 
missing bushes in an area of escapes, and also of the possible addi- 
tion to the sodium-arsenite solution of a dye, such, for instance, as 
phenolphthalein, to color the solution and indicate where it has 
been placed. 
On September 25, 1922, 1 gallon of " 8-pound " sodium arsenite 
was used to treat 12 escaped barberry bushes growing on a property 
about 12 miles west of Pontiac, Mich. There were about 100 
escaped bushes on this property, most of them growing along tho 
banks of the Huron River in very sandy soil. All but 12 of the 
bushes were dug, the larger ones being first dynamited. The cost of 
the dynamite, fuse, and cap totaled about 16 cents a bush. Because 
of the sandy nature of the soil, digging was fairly easy, and only a 
few sprouts were found the following year. Of the 12 bushes that 
were treated with sodium arsenite, 3 were large and the rest of 
medium size. The arsenic solution was mixed 1 to 40, and about 2 
gallons of it was applied to the mid-sized bushes and as much as 7 
gallons to the largest. One of the large bushes which received 4 
gallons was on the edge of the bank about 3 feet above the water in 
