Vol. 15—1961 - NorthEastern Weed Science Society

3770
- Table I, Chemicals Used and Stand Counts
(Euphorbia cyparissias).
on Cypress
1958.
Spurge
August 18, 1959
Tre0.tment Rate/A. Average No. of Shoots/Sq. ft.
No. Chemical Lbs , A.E. Average of 3 - 2 sq. ft. quadrats
1 ACP - 638 6 8.8
2 ACP ­ 638 12
'7·6
.3 ACP .. 638 6
"7·3
4 Simazine 10 18·5
5 Simazlne 20 12.,
6 Simaz1ne· 10 18·5
7 Amino ~riaZ01e~p)'5 9.4
8 Amino Triazole ~)10 9·1
9 Amino ~riazole p) 5
7.6
10 Benzac 1281 6
17.8
11 Benzac 1281 12 27·0
12 Benzac 1281 6 22.8
13 Check 0 16·7
On August 18, 1959 a number of the above plots were re-treated as shown
in Table II. The Cypress Spurge was 8 .. 10 inches tall when treated and all
chemicals were applied in 30 gallons of wate r per acre.
Table II. Re-treatments on Cypress Spurge (Euphorbia cyparissias)
August 18, 1959.
'
Treatment Treatment Chemical Used Rate/A. Av. No. Shoots/sq. ft.
No. 1959 No. 1958 in 1959 lba. A.E. at time of treatment
1 13 Atrazine 4
2 12 Atrazine 8 22.8
3 4 Amitro1-T 4
4 5 Amitrol ..T 8
5
8 Karmex-Diuron
6
9 Amino ~riazo1e (p)
7 :3 ACP .. 638 6
Visual observations and ratings on these plots during 1960 showed Amitrol-T
Amino Triazole (s) I ACP-638 to be most effective in reducing the stand of Cypress
Spurge.
Observations on other plots established in August 1959 showed 2,4,5-T at
5 pounds per acre to be as effective as the above treatments.
7·;
5
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~: A mimeographed copy of complete paper is available from ~he author.