Canada thistle control 8 to 12 months after post-harvest (late August to early October) herbicide application, NDSU and SDSU trials, 1990-99.

Herbicide^1		Canada thistle control^2		Number of trials
Trade name	Rate	Range	Average
	pt/acre	%
2,4-D	2	24-78	43	4
	4	32-53	41	4
Banvel	2	43-89	67	7
	4	86-90	88	2
Banvel + 2,4-D	1 + 2	27-46	35	4
Roundup	2	71-96	83	7
	3	87-88	88	2
Roundup + 2,4-D	1 + 1.25	61-72	67	2
	2 + 1	56-63	60	2
Fallowmaster	2.75	19-84	44	3
Roundup + Banvel	2 + 1	87-95	91	2
Curtail	2	39-68	55	8
	4	50-79	68	7
Tordon + 2,4-D	1 + 2	59-95	80	3
Distinct	6 oz	63-67	65	2

¹Adjuvants not listed.

²Several trials include tillage and crop competition after herbicide application to supplement control.

(October, 2000)