North Dakota State University
NDSU Extension Service
Survey of Weeds in North Dakota - 2000
ER-83, May 2003
R. K. Zollinger, NDSU Extension Weed Specialist
Table 14. Adams county weed infestation based on 13 surveyed fields, spring 2000.
|
|
|
|
Weed |
|
| |
Weed
|
Field Uniformity |
Weed Density |
Density Range |
Weed |
| Weed species |
Frequency |
All |
Infested |
All |
Infested |
Low |
High |
Index |
| |
(%) |
(%) |
(%) |
- - Plants/m2 - - |
- - Plants/m2 - - |
|
| Green foxtail
|
100.0 |
44.6 |
44.6 |
24.3 |
24.3 |
0.2 |
10.8 |
134.8 |
| Kochia
|
61.5 |
23.8 |
38.8 |
15.5 |
25.2 |
0.1 |
8.6 |
80.5 |
| Wild buckwheat
|
69.2 |
30.0 |
43.3 |
5.4 |
7.8 |
<0.1 |
2.8 |
65.6 |
| Wild oat
|
61.5 |
21.5 |
35.0 |
4.3 |
7.0 |
<0.1 |
2.9 |
52.1 |
| Russian thistle |
38.5 |
16.2 |
42.0 |
8.8 |
22.8 |
<0.1 |
8.0 |
49.5 |
| Field bindweed
|
46.2 |
13.8 |
30.0 |
3.1 |
6.8 |
<0.1 |
2.8 |
36.6 |
| Prairie wild rose
|
38.5 |
11.5 |
30.0 |
2.1 |
5.4 |
<0.1 |
2.4 |
29.2 |
| Common lambsquarters |
38.5 |
10.8 |
28.0 |
2.3 |
6.0 |
<0.1 |
2.6 |
29.0 |
| Pigweed species |
30.8 |
11.5 |
37.5 |
2.1 |
6.7 |
<0.1 |
2.5 |
26.6 |
| Dandelion
|
23.1 |
7.7 |
33.3 |
1.1 |
4.7 |
<0.1 |
1.7 |
17.9 |
| Sunflower
|
7.7 |
<0.1 |
<0.1 |
4.4 |
57.1 |
0.2 |
40.0 |
12.8 |
| Flixweed/Tansy mustard |
15.4 |
4.6 |
30.0 |
0.7 |
4.8 |
<0.1 |
2.0 |
11.5 |
| Field pennycress |
7.7 |
3.1 |
40.0 |
2.2 |
28.0 |
<0.1 |
15.0 |
10.7 |
| Volunteer cereal |
7.7 |
4.6 |
60.0 |
1.0 |
12.9 |
<0.1 |
4.0 |
9.5 |
| Downy brome
|
7.7 |
3.1 |
40.0 |
1.6 |
20.5 |
<0.1 |
15.0 |
9.3 |
| Quackgrass
|
7.7 |
2.3 |
30.0 |
1.2 |
16.1 |
<0.1 |
7.0 |
7.8 |
| Erect knotweed
|
7.7 |
2.3 |
30.0 |
1.1 |
14.0 |
<0.1 |
5.0 |
7.4 |
| Common ragweed
|
7.7 |
3.1 |
40.0 |
0.4 |
5.4 |
<0.1 |
2.0 |
6.6 |
| Common cocklebur |
7.7 |
2.3 |
30.0 |
0.3 |
4.3 |
<0.1 |
2.0 |
5.6 |
| Barnyardgrass
|
7.7 |
2.3 |
30.0 |
0.3 |
4.3 |
<0.1 |
2.0 |
5.6 |
| Perennial sowthistle |
7.7 |
2.3 |
30.0 |
0.2 |
3.2 |
<0.1 |
1.0 |
5.5 |
| Wild mustard
|
7.7 |
1.5 |
20.0 |
0.2 |
2.2 |
<0.1 |
1.0 |
4.5 |
| Alfalfa
|
7.7 |
0.8 |
10.0 |
0.1 |
1.1 |
<0.1 |
1.0 |
3.5 |
| Weed free
|
23.1 |
4.6 |
20.0 |
- |
- |
- |
- |
- |
| Table 15. Barnes county weed infestations based on 66 surveyed fields, spring 2000. |
| |
|
|
|
Weed |
|
| |
Weed
|
Field Uniformity |
Weed Density |
Density Range |
Weed |
| Weed species |
Frequency |
All |
Infested |
All |
Infested |
Low |
High |
Index |
| |
(%) |
(%) |
(%) |
- - Plants/m2 - - |
- - Plants/m2 - - |
|
| Green foxtail
|
78.8 |
33.3 |
42.3 |
29.1 |
36.9 |
1.6 |
24.3 |
127.4 |
| Wild mustard
|
66.7 |
25.2 |
37.7 |
12.8 |
19.3 |
0.1 |
5.9 |
77.3 |
| Canada thistle
|
59.1 |
14.8 |
25.1 |
3.3 |
5.6 |
<0.1 |
2.6 |
42.2 |
| Pigweed species |
34.8 |
11.2 |
32.2 |
6.2 |
17.8 |
<0.1 |
6.0 |
37.3 |
| Wild buckwheat
|
39.4 |
12.0 |
30.4 |
3.9 |
10.0 |
0.1 |
4.2 |
34.3 |
| Yellow foxtail
|
18.2 |
8.9 |
49.2 |
6.1 |
33.5 |
<0.1 |
9.3 |
29.2 |
| Wild oat
|
27.3 |
6.2 |
22.8 |
3.8 |
13.8 |
<0.1 |
7.0 |
24.1 |
| Kochia
|
33.3 |
7.4 |
22.3 |
1.9 |
5.8 |
<0.1 |
3.5 |
23.1 |
| Common lambsquarters |
24.2 |
6.8 |
28.1 |
2.8 |
11.6 |
<0.1 |
5.1 |
21.4 |
| Sunflower
|
13.6 |
7.4 |
54.4 |
3.3 |
24.5 |
<0.1 |
6.1 |
19.8 |
| Eastern black nightshade |
16.7 |
3.0 |
18.2 |
1.7 |
10.2 |
<0.1 |
7.1 |
12.5 |
| Common ragweed
|
18.2 |
3.9 |
21.7 |
0.8 |
4.7 |
<0.1 |
2.5 |
12.0 |
| Common cocklebur |
10.6 |
3.6 |
34.3 |
1.5 |
14.5 |
<0.1 |
4.7 |
10.7 |
| Volunteer cereal |
13.6 |
3.9 |
28.9 |
0.6 |
4.1 |
<0.1 |
8.1 |
9.8 |
| Common milkweed
|
13.6 |
3.0 |
22.2 |
0.7 |
5.3 |
<0.1 |
2.7 |
9.3 |
| Common purslane |
7.6 |
3.3 |
44.0 |
1.1 |
14.6 |
<0.1 |
4.4 |
8.4 |
| Annual smartweed |
13.6 |
2.1 |
15.6 |
0.6 |
4.4 |
<0.1 |
2.8 |
8.1 |
| Common mallow
|
7.6 |
2.3 |
30.0 |
0.7 |
9.5 |
<0.1 |
4.4 |
6.5 |
| Prickly lettuce |
9.1 |
2.3 |
25.0 |
0.3 |
3.8 |
<0.1 |
1.8 |
6.1 |
| Russian thistle |
9.1 |
2.1 |
23.3 |
0.4 |
4.1 |
<0.1 |
1.8 |
6.0 |
| Giant ragweed
|
6.1 |
2.1 |
35.0 |
0.7 |
11.6 |
<0.1 |
4.5 |
5.8 |
| Field pennycress |
6.1 |
1.8 |
30.0 |
0.4 |
6.5 |
<0.1 |
1.8 |
4.8 |
| Quackgrass
|
4.5 |
0.8 |
16.7 |
0.7 |
15.1 |
<0.1 |
9.3 |
3.9 |
| Buffalobur
|
6.1 |
1.2 |
20.0 |
0.2 |
3.2 |
<0.1 |
1.8 |
3.7 |
| Soybean
|
4.5 |
1.5 |
33.3 |
0.2 |
3.9 |
<0.1 |
1.3 |
3.4 |
| Canola
|
3.0 |
1.4 |
45.0 |
0.3 |
10.8 |
<0.1 |
3.0 |
3.1 |
| Perennial sowthistle |
6.1 |
0.6 |
10.0 |
0.2 |
2.7 |
<0.1 |
2.5 |
3.0 |
| Field bindweed
|
4.5 |
0.6 |
13.3 |
0.1 |
3.2 |
<0.1 |
2.3 |
2.5 |
| Dandelion
|
4.5 |
0.6 |
13.3 |
0.1 |
1.4 |
<0.1 |
1.0 |
2.3 |
| Venice mallow
|
1.5 |
0.8 |
50.0 |
0.4 |
25.8 |
<0.1 |
12.0 |
2.2 |
| Corn
|
1.5 |
0.8 |
50.0 |
0.4 |
24.8 |
<0.1 |
9.0 |
2.1 |
| Nightflowering catchfly |
3.0 |
0.5 |
15.0 |
0.1 |
2.2 |
<0.1 |
1.5 |
1.6 |
| Shepherd's-purse
|
1.5 |
0.3 |
20.0 |
0.3 |
17.2 |
<0.1 |
9.0 |
1.4 |
| Hedge bindweed
|
1.5 |
0.5 |
30.0 |
<0.1 |
3.2 |
<0.1 |
1.0 |
1.1 |
| Flixweed/Tansy mustard |
1.5 |
0.3 |
20.0 |
0.1 |
6.5 |
<0.1 |
4.0 |
1.0 |
| Curly dock
|
1.5 |
0.3 |
20.0 |
<0.1 |
2.2 |
<0.1 |
1.0 |
0.9 |
| Marshelder
|
1.5 |
0.2 |
10.0 |
<0.1 |
3.2 |
<0.1 |
3.0 |
0.8 |
| Prostrate pigweed |
1.5 |
0.2 |
10.0 |
<0.1 |
1.1 |
<0.1 |
1.0 |
0.7 |
| Weed free
|
39.4 |
12.3 |
31.2 |
- |
- |
- |
- |
- |
| Table 16. Benson county weed infestations based on 36 surveyed fields, spring 2000. |
| |
|
|
|
Weed |
|
| |
Weed
|
Field Uniformity |
Weed Density |
Density Range |
Weed |
| Weed species |
Frequency |
All |
Infested |
All |
Infested |
Low |
High |
Index |
| |
(%) |
(%) |
(%) |
- - Plants/m2 - - |
- - Plants/m2 - - |
|
| Green foxtail
|
80.6 |
21.7 |
26.9 |
25.7 |
31.9 |
5.9 |
46.5 |
108.4 |
| Wild oat
|
55.6 |
26.7 |
48.0 |
9.7 |
17.5 |
<0.1 |
5.4 |
67.9 |
| Wild mustard
|
52.8 |
21.4 |
40.5 |
11.8 |
22.3 |
0.1 |
9.9 |
66.5 |
| Wild buckwheat
|
58.3 |
16.1 |
27.6 |
12.9 |
22.1 |
0.3 |
7.3 |
65.6 |
| Canada thistle
|
61.1 |
20.8 |
34.1 |
6.3 |
10.3 |
<0.1 |
3.9 |
55.9 |
| Kochia
|
47.2 |
13.1 |
27.6 |
8.3 |
17.6 |
0.7 |
16.1 |
48.2 |
| Canola
|
22.2 |
11.9 |
53.8 |
9.5 |
42.7 |
0.1 |
19.0 |
41.5 |
| Pigweed species |
30.6 |
9.2 |
30.0 |
8.6 |
28.2 |
0.1 |
14.4 |
39.4 |
| Common lambsquarters |
22.2 |
7.2 |
32.5 |
5.1 |
22.9 |
0.1 |
16.3 |
26.5 |
| Common ragweed
|
30.6 |
9.2 |
30.0 |
2.1 |
6.8 |
<0.1 |
3.5 |
24.2 |
| Yellow foxtail
|
11.1 |
6.4 |
57.5 |
5.4 |
48.2 |
0.1 |
15.8 |
22.6 |
| Field pennycress |
22.2 |
8.1 |
36.3 |
2.8 |
12.4 |
<0.1 |
18.3 |
21.9 |
| Sunflower
|
13.9 |
6.4 |
46.0 |
3.6 |
25.6 |
<0.1 |
6.8 |
19.3 |
| Volunteer cereal |
22.2 |
7.8 |
35.0 |
1.8 |
7.9 |
<0.1 |
3.3 |
19.3 |
| Prickly lettuce |
25.0 |
5.6 |
22.2 |
1.5 |
6.1 |
<0.1 |
3.7 |
17.4 |
| Russian thistle |
16.7 |
3.9 |
23.3 |
2.0 |
11.8 |
<0.1 |
8.0 |
14.0 |
| Quackgrass
|
11.1 |
4.7 |
42.5 |
1.8 |
16.4 |
<0.1 |
6.5 |
12.7 |
| Flixweed/Tansy mustard |
8.3 |
2.8 |
33.3 |
0.5 |
5.7 |
<0.1 |
2.3 |
6.7 |
| Eastern black nightshade |
8.3 |
2.2 |
26.7 |
0.5 |
6.1 |
<0.1 |
3.0 |
6.2 |
| Common mallow
|
11.1 |
1.4 |
12.5 |
0.2 |
2.2 |
<0.1 |
1.5 |
5.7 |
| Field bindweed
|
8.3 |
1.4 |
16.7 |
0.2 |
2.2 |
<0.1 |
1.3 |
4.6 |
| Perennial sowthistle |
5.6 |
0.8 |
15.0 |
0.1 |
2.7 |
<0.1 |
2.0 |
3.0 |
| Common cocklebur |
2.8 |
0.6 |
20.0 |
0.3 |
11.8 |
<0.1 |
10.0 |
2.2 |
| Annual smartweed |
2.8 |
0.6 |
20.0 |
0.1 |
5.4 |
<0.1 |
4.0 |
1.8 |
| Prostrate pigweed |
2.8 |
0.6 |
20.0 |
0.1 |
3.2 |
<0.1 |
2.0 |
1.7 |
| Common milkweed
|
2.8 |
0.3 |
10.0 |
0.1 |
5.4 |
<0.1 |
5.0 |
1.6 |
| Common purslane |
2.8 |
0.3 |
10.0 |
0.1 |
2.2 |
<0.1 |
2.0 |
1.3 |
| Venice mallow
|
2.8 |
0.3 |
10.0 |
<0.1 |
1.1 |
<0.1 |
1.0 |
1.3 |
| Dandelion
|
2.8 |
0.3 |
10.0 |
<0.1 |
1.1 |
<0.1 |
1.0 |
1.3 |
| Weed free
|
19.4 |
4.7 |
24.3 |
- |
- |
- |
- |
- |
Table 17. Billings county weed infestations based on 10 surveyed fields, spring 2000.
|
|
|
|
Weed |
|
| |
Weed
|
Field Uniformity |
Weed Density |
Density Range |
Weed |
| Weed species |
Frequency |
All |
Infested |
All |
Infested |
Low |
High |
Index |
| |
(%) |
(%) |
(%) |
- - Plants/m2 - - |
- - Plants/m2 - - |
|
| Green foxtail
|
66.7 |
<0.1 |
<0.1 |
38.9 |
58.3 |
2.9 |
23.7 |
112.9 |
| Wild mustard
|
66.7 |
16.7 |
25.0 |
27.0 |
40.5 |
2.1 |
10.3 |
102.0 |
| Wild buckwheat
|
77.8 |
30.0 |
38.6 |
14.5 |
18.6 |
0.3 |
4.9 |
89.7 |
| Russian thistle |
44.4 |
14.4 |
32.5 |
5.7 |
12.9 |
<0.1 |
5.8 |
42.7 |
| Common lambsquarters |
44.4 |
18.9 |
42.5 |
3.0 |
6.7 |
<0.1 |
1.8 |
40.7 |
| Field bindweed
|
33.3 |
10.0 |
30.0 |
6.3 |
19.0 |
0.1 |
4.0 |
35.9 |
| Volunteer cereal |
11.1 |
8.9 |
80.0 |
8.1 |
73.2 |
<0.1 |
15.0 |
31.6 |
| Pigweed species |
22.2 |
11.1 |
50.0 |
2.3 |
10.2 |
<0.1 |
2.5 |
23.8 |
| Wild oat
|
22.2 |
10.0 |
45.0 |
2.2 |
9.7 |
<0.1 |
3.0 |
22.4 |
| Canada thistle
|
22.2 |
5.6 |
25.0 |
1.8 |
8.1 |
<0.1 |
4.0 |
17.1 |
| Flixweed/Tansy mustard |
22.2 |
5.6 |
25.0 |
0.7 |
3.2 |
<0.1 |
1.5 |
14.6 |
| Kochia
|
22.2 |
4.4 |
20.0 |
0.8 |
3.8 |
<0.1 |
2.0 |
13.8 |
| Common cocklebur |
11.1 |
5.6 |
50.0 |
1.3 |
11.8 |
<0.1 |
4.0 |
12.3 |
| Hedge bindweed
|
11.1 |
5.6 |
50.0 |
1.0 |
8.6 |
<0.1 |
2.0 |
11.5 |
| Field pennycress |
11.1 |
3.3 |
30.0 |
1.0 |
8.6 |
<0.1 |
4.0 |
9.3 |
| Horseweed
|
11.1 |
3.3 |
30.0 |
0.4 |
3.2 |
<0.1 |
1.0 |
7.9 |
| Sweetclover
|
11.1 |
3.3 |
30.0 |
0.4 |
3.2 |
<0.1 |
1.0 |
7.9 |
Table 18. Bottineau county weed infestations based on 43 surveyed fields, spring 2000.
|
|
|
|
Weed |
|
| |
Weed
|
Field Uniformity |
Weed Density |
Density Range |
Weed |
| Weed species |
Frequency |
All |
Infested |
All |
Infested |
Low |
High |
Index |
| |
(%) |
(%) |
(%) |
- - Plants/m2 - - |
- - Plants/m2 - - |
|
| Green foxtail
|
74.4 |
18.8 |
25.3 |
32.6 |
43.8 |
3.0 |
33.6 |
119.8 |
| Wild buckwheat
|
72.1 |
23.5 |
32.6 |
11.9 |
16.5 |
0.1 |
7.7 |
75.3 |
| Wild oat
|
53.5 |
20.2 |
37.8 |
9.8 |
18.3 |
0.1 |
9.5 |
60.9 |
| Pigweed species |
41.9 |
14.4 |
34.4 |
9.2 |
21.9 |
<0.1 |
11.7 |
49.8 |
| Yellow foxtail
|
23.3 |
9.8 |
42.0 |
10.3 |
44.5 |
1.1 |
35.5 |
41.6 |
| Kochia
|
34.9 |
15.1 |
43.3 |
5.3 |
15.3 |
<0.1 |
6.7 |
39.2 |
| Canola
|
18.6 |
9.8 |
52.5 |
4.7 |
25.2 |
<0.1 |
10.6 |
26.9 |
| Field pennycress |
18.6 |
4.7 |
25.0 |
3.0 |
16.3 |
<0.1 |
19.8 |
17.9 |
| Canada thistle
|
25.6 |
4.2 |
16.4 |
1.0 |
3.9 |
<0.1 |
2.8 |
15.0 |
| Wild mustard
|
18.6 |
3.3 |
17.5 |
1.9 |
10.0 |
<0.1 |
5.1 |
13.8 |
| Volunteer cereal |
11.6 |
3.7 |
32.0 |
1.0 |
8.2 |
<0.1 |
4.2 |
9.8 |
| Russian thistle |
9.3 |
3.5 |
37.5 |
1.4 |
14.8 |
<0.1 |
7.5 |
9.8 |
| Common lambsquarters |
16.3 |
2.8 |
17.1 |
0.6 |
3.5 |
<0.1 |
2.3 |
9.6 |
| Common ragweed
|
11.6 |
2.1 |
18.0 |
0.7 |
6.0 |
<0.1 |
4.4 |
7.6 |
| Quackgrass
|
9.3 |
2.1 |
22.5 |
0.7 |
7.8 |