Herbicide Resistant Weeds by Year and Site of Action (This data can be used to make the species x SOA x year resistance graph) : Friday, May 3, 2024

Year	Total	A	B	C1	C2	D	G	K1	O	F2	Other
1957	2	0	0	0	0	0	0	0	2	0	0
1970	2	0	0	0	0	0	0	0	2	0	0
1972	2	0	0	0	0	0	0	0	2	0	0
1973	3	0	0	0	0	0	0	1	2	0	0
1975	3	0	0	0	0	0	0	1	2	0	0
1976	3	0	0	0	0	0	0	1	2	0	0
1977	3	0	0	0	0	0	0	1	2	0	0
1978	3	0	0	0	0	0	0	1	2	0	0
1979	4	0	0	0	0	0	0	1	3	0	0
1980	7	0	0	0	0	3	0	1	3	0	0
1981	9	0	0	0	0	4	0	1	4	0	0
1982	15	2	1	0	0	5	0	2	4	0	1
1983	17	2	1	0	0	5	0	2	5	0	2
1984	21	2	2	0	0	7	0	2	5	0	3
1985	25	3	2	0	0	8	0	2	6	0	4
1986	29	3	3	0	0	10	0	2	6	0	5
1987	34	4	6	0	0	10	0	3	6	0	5
1988	41	4	8	0	0	11	0	4	8	0	6
1989	50	5	11	0	0	13	0	5	9	0	7
1990	60	6	13	0	0	18	0	6	10	0	7
1991	67	9	15	0	0	20	0	6	10	0	7
1992	74	10	18	0	0	20	0	8	10	0	8
1993	93	12	32	0	0	21	0	8	11	0	9
1994	101	13	37	0	0	21	0	8	12	0	10
1995	107	13	41	0	0	21	0	8	13	0	11
1996	126	17	54	0	0	21	1	8	14	0	11
1997	141	20	63	0	0	21	2	9	15	0	11
1998	152	22	69	0	0	21	2	9	17	0	12
1999	164	26	73	0	0	21	2	10	20	0	12
2000	177	29	81	0	0	21	3	10	21	0	12
2001	186	31	85	0	0	22	4	10	21	0	13
2002	197	33	88	0	0	23	4	10	23	0	16
2003	200	33	89	0	0	23	6	10	23	0	16
2004	217	33	98	0	0	23	9	11	23	0	20
2005	237	35	105	0	0	24	14	11	25	0	23
2006	242	35	109	0	0	25	14	11	25	0	23
2007	254	36	116	0	0	26	16	11	26	0	23
2008	260	36	119	0	0	26	19	11	26	0	23
2009	278	40	125	0	0	27	20	11	27	2	26
2010	297	43	133	0	0	28	25	12	27	2	27
2011	315	43	140	0	0	31	26	12	28	2	33
2012	328	44	149	0	0	31	28	12	29	2	33
2013	335	44	153	0	0	31	29	12	31	2	33
2014	354	47	160	0	0	31	34	12	32	2	36
2015	371	47	162	0	0	32	38	12	36	3	41
2016	379	48	162	0	0	32	41	12	39	3	42
2017	390	49	164	0	0	32	43	12	40	3	47
2018	398	49	166	0	0	32	49	12	40	3	47
2019	408	49	169	0	0	32	54	12	42	3	47
2020	415	50	172	0	0	32	55	12	42	3	49
2021	419	50	172	0	0	32	57	12	42	3	51
2022	426	51	173	0	0	33	58	12	43	4	52
2023	430	51	174	0	0	33	59	12	44	5	52

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, May 3, 2024 .  Available  www.weedscience.org
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