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 81. Adams county weed infestations based on 8 surveyed fields, summer 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
|
87.5 |
55.0 |
62.9 |
10.2 |
11.7 |
<0.1 |
2.9 |
108.0 |
| Wild oat
|
75.0 |
35.0 |
46.7 |
7.4 |
9.9 |
<0.1 |
3.3 |
77.3 |
| Kochia
|
62.5 |
26.3 |
42.0 |
5.7 |
9.0 |
<0.1 |
3.4 |
60.3 |
| Russian thistle |
62.5 |
22.5 |
36.0 |
3.2 |
5.2 |
<0.1 |
2.0 |
50.9 |
| Wild buckwheat
|
50.0 |
20.0 |
40.0 |
3.9 |
7.8 |
<0.1 |
2.5 |
45.8 |
| Sunflower
|
50.0 |
11.3 |
22.5 |
1.6 |
3.2 |
<0.1 |
1.8 |
31.7 |
| Field bindweed
|
37.5 |
10.0 |
26.7 |
2.6 |
6.8 |
<0.1 |
4.0 |
28.5 |
| Common cocklebur |
37.5 |
7.5 |
20.0 |
1.7 |
4.7 |
<0.1 |
3.3 |
24.1 |
| Prairie wild rose
|
37.5 |
6.3 |
16.7 |
0.8 |
2.2 |
<0.1 |
1.3 |
20.6 |
| Sweetclover
|
25.0 |
5.0 |
20.0 |
0.7 |
2.7 |
<0.1 |
1.5 |
14.9 |
| Pigweed species |
25.0 |
5.0 |
20.0 |
0.5 |
2.2 |
<0.1 |
1.0 |
14.6 |
| Volunteer cereal |
12.5 |
7.5 |
60.0 |
1.1 |
8.6 |
<0.1 |
2.0 |
14.2 |
| Common ragweed
|
25.0 |
3.8 |
15.0 |
0.7 |
2.7 |
<0.1 |
2.0 |
13.7 |
| Perennial sowthistle |
12.5 |
5.0 |
40.0 |
0.9 |
7.5 |
<0.1 |
2.0 |
11.4 |
| Downy brome
|
12.5 |
2.5 |
20.0 |
0.7 |
5.4 |
<0.1 |
4.0 |
8.2 |
| Quackgrass
|
12.5 |
1.3 |
10.0 |
0.5 |
4.3 |
<0.1 |
4.0 |
6.7 |
| Common milkweed
|
12.5 |
1.3 |
10.0 |
0.1 |
1.1 |
<0.1 |
1.0 |
5.7 |
| Weed free
|
12.5 |
1.3 |
10.0 |
- |
- |
- |
- |
- |
| Table 82. Barnes county weed infestations based on 25 surveyed fields, summer 2000. |
| |
|
|
|
Weed |
|
| |
Weed
|
Field Uniformity |
Weed Density |
Density Range |
Weed |
| Weed species |
Frequency |
All |
Infested |
All |
Infested |
Low |
High |
Index |
| |
(%) |
(%) |
(%) |
- - Plants/m2 - - |
- - Plants/m2 - - |
|
| Yellow foxtail
|
32.0 |
14.0 |
43.8 |
8.7 |
27.0 |
<0.1 |
7.6 |
44.9 |
| Green foxtail
|
40.0 |
15.6 |
39.0 |
4.2 |
10.4 |
<0.1 |
4.2 |
38.7 |
| Kochia
|
44.0 |
15.6 |
35.5 |
3.5 |
7.9 |
<0.1 |
2.9 |
38.4 |
| Canada thistle
|
40.0 |
7.2 |
18.0 |
1.3 |
3.3 |
<0.1 |
1.9 |
23.6 |
| Sunflower
|
24.0 |
5.6 |
23.3 |
1.0 |
4.3 |
<0.1 |
2.0 |
16.0 |
| Wild buckwheat
|
24.0 |
4.8 |
20.0 |
1.1 |
4.7 |
<0.1 |
2.5 |
15.4 |
| Common milkweed
|
28.0 |
4.0 |
14.3 |
0.5 |
1.7 |
<0.1 |
1.1 |
14.4 |
| Common ragweed
|
20.0 |
4.8 |
24.0 |
0.8 |
3.9 |
<0.1 |
2.0 |
13.3 |
| Wild oat
|
16.0 |
4.0 |
25.0 |
1.0 |
6.2 |
<0.1 |
3.3 |
11.6 |
| Pigweed species |
16.0 |
4.0 |
25.0 |
0.7 |
4.6 |
<0.1 |
2.3 |
11.0 |
| Common cocklebur |
12.0 |
4.4 |
36.7 |
0.6 |
5.4 |
<0.1 |
2.0 |
9.9 |
| Volunteer cereal |
12.0 |
2.4 |
20.0 |
0.3 |
2.9 |
<0.1 |
1.7 |
7.2 |
| Venice mallow
|
4.0 |
2.4 |
60.0 |
1.2 |
31.2 |
<0.1 |
9.0 |
6.6 |
| Hairy nightshade |
8.0 |
2.0 |
25.0 |
0.3 |
4.3 |
<0.1 |
2.0 |
5.5 |
| Biennial wormwood |
8.0 |
2.0 |
25.0 |
0.3 |
3.8 |
<0.1 |
1.5 |
5.4 |
| Field bindweed
|
8.0 |
1.2 |
15.0 |
0.2 |
2.2 |
<0.1 |
1.5 |
4.3 |
| Common lambsquarters |
8.0 |
1.2 |
15.0 |
0.1 |
1.6 |
<0.1 |
1.0 |
4.2 |
| Yellow nutsedge |
4.0 |
1.2 |
30.0 |
0.3 |
6.5 |
<0.1 |
3.0 |
3.1 |
| Marshelder
|
4.0 |
1.2 |
30.0 |
0.2 |
4.3 |
<0.1 |
2.0 |
2.9 |
| Barnyardgrass
|
4.0 |
0.8 |
20.0 |
0.1 |
3.2 |
<0.1 |
2.0 |
2.4 |
| Flixweed/Tansy mustard |
4.0 |
0.4 |
10.0 |
<0.1 |
1.1 |
<0.1 |
1.0 |
1.8 |
| Prickly lettuce |
4.0 |
0.4 |
10.0 |
<0.1 |
1.1 |
<0.1 |
1.0 |
1.8 |
| Annual smartweed |
4.0 |
0.4 |
10.0 |
<0.1 |
1.1 |
<0.1 |
1.0 |
1.8 |
| Common mallow
|
4.0 |
0.4 |
10.0 |
<0.1 |
1.1 |
<0.1 |
1.0 |
1.8 |
| Quackgrass
|
4.0 |
0.4 |
10.0 |
<0.1 |
1.1 |
<0.1 |
1.0 |
1.8 |
| Weed free
|
100.0 |
38.0 |
38.0 |
- |
- |
- |
- |
- |
| Table 83. Benson county weed infestations based on 16 surveyed fields, summer 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
|
87.5 |
41.3 |
47.1 |
40.8 |
46.6 |
0.8 |
26.6 |
165.5 |
| Yellow foxtail
|
81.3 |
33.1 |
40.8 |
35.5 |
43.7 |
2.3 |
20.0 |
143.1 |
| Canada thistle
|
75.0 |
23.1 |
30.8 |
9.4 |
12.5 |
<0.1 |
6.3 |
69.9 |
| Pigweed species |
68.8 |
20.6 |
30.0 |
4.6 |
6.8 |
<0.1 |
3.0 |
54.4 |
| Wild buckwheat
|
56.3 |
20.6 |
36.7 |
5.4 |
9.6 |
<0.1 |
2.9 |
51.9 |
| Common ragweed
|
37.5 |
15.6 |
41.7 |
4.6 |
12.4 |
<0.1 |
3.0 |
39.0 |
| Kochia
|
43.8 |
7.5 |
17.1 |
4.5 |
10.3 |
0.1 |
3.4 |
32.6 |
| Canola
|
18.8 |
4.4 |
23.3 |
8.3 |
44.5 |
0.1 |
12.3 |
30.1 |
| Volunteer cereal |
18.8 |
8.1 |
43.3 |
4.0 |
21.2 |
<0.1 |
9.3 |
23.6 |
| Flixweed/Tansy mustard
|
25.0 |
8.8 |
35.0 |
1.6 |
6.5 |
<0.1 |
3.0 |
20.9 |
| Prickly lettuce |
31.3 |
6.9 |
22.0 |
1.3 |
4.3 |
<0.1 |
2.2 |
20.4 |
| Wild oat
|
31.3 |
5.0 |
16.0 |
1.3 |
4.1 |
0.8 |
8.0 |
18.4 |
| Field pennycress |
18.8 |
5.0 |
26.7 |
1.7 |
9.3 |
<0.1 |
5.3 |
15.3 |
| Quackgrass
|
18.8 |
3.8 |
20.0 |
0.9 |
4.7 |
<0.1 |
2.7 |
12.0 |
| Eastern black nightshade |
18.8 |
2.5 |
13.3 |
0.7 |
3.9 |
<0.1 |
3.3 |
10.5 |
| Russian thistle |
18.8 |
2.5 |
13.3 |
0.5 |
2.5 |
<0.1 |
2.0 |
9.8 |
| Common milkweed
|
12.5 |
1.3 |
10.0 |
0.7 |
5.4 |
<0.1 |
5.0 |
7.0 |
| Common mallow
|
12.5 |
1.9 |
15.0 |
0.4 |
3.2 |
<0.1 |
2.5 |
7.0 |
| Dandelion
|
6.3 |
1.9 |
30.0 |
0.5 |
7.5 |
<0.1 |
4.0 |
5.1 |
| Marshelder
|
6.3 |
1.3 |
20.0 |
0.1 |
2.2 |
<0.1 |
1.0 |
3.6 |
| Wild mustard
|
6.3 |
1.3 |
20.0 |
0.1 |
2.2 |
<0.1 |
1.0 |
3.6 |
| Common lambsquarters |
6.3 |
0.6 |
10.0 |
0.1 |
2.2 |
<0.1 |
2.0 |
3.0 |
| Cutleaf nightshade |
6.3 |
0.6 |
10.0 |
0.1 |
2.2 |
<0.1 |
2.0 |
3.0 |
| Prairie wild rose
|
6.3 |
0.6 |
10.0 |
0.1 |
1.1 |
<0.1 |
1.0 |
2.9 |
| Flax
|
6.3 |
0.6 |
10.0 |
0.1 |
1.1 |
<0.1 |
1.0 |
2.9 |
| Dry bean
|
6.3 |
0.6 |
10.0 |
0.1 |
1.1 |
<0.1 |
1.0 |
2.9 |
| Weed free
|
18.8 |
2.5 |
13.3 |
- |
- |
- |
- |
- |
| Table 84. Billings county weed infestations based on 4 surveyed fields, summer 2000. |
| |
|
|
|
Weed |
|
| |
Weed
|
Field Uniformity |
Weed Density |
Density Range |
Weed |
| Weed species |
Frequency |
All |
Infested |
All |
Infested |
Low |
High |
Index |
| |
(%) |
(%) |
(%) |
- - Plants/m2 - - |
- - Plants/m2 - - |
|
| Wild buckwheat
|
75.0 |
35.0 |
46.7 |
5.1 |
6.8 |
<0.1 |
2.3 |
71.9 |
| Green foxtail
|
75.0 |
10.0 |
13.3 |
14.3 |
19.0 |
0.5 |
4.3 |
68.3 |
| Wild oat
|
75.0 |
17.5 |
23.3 |
2.2 |
2.9 |
<0.1 |
1.3 |
47.5 |
| Yellow foxtail
|
25.0 |
20.0 |
80.0 |
4.6 |
18.3 |
<0.1 |
4.0 |
39.0 |
| Russian thistle |
50.0 |
15.0 |
30.0 |
2.4 |
4.8 |
<0.1 |
2.0 |
37.3 |
| Kochia
|
50.0 |
12.5 |
25.0 |
1.3 |
2.7 |
<0.1 |
1.0 |
32.3 |
| Field pennycress |
25.0 |
10.0 |
40.0 |
1.6 |
6.5 |
<0.1 |
3.0 |
22.1 |
| Canola
|
25.0 |
7.5 |
30.0 |
0.8 |
3.2 |
<0.1 |
1.0 |
17.7 |
| Field bindweed
|
25.0 |
5.0 |
20.0 |
0.5 |
2.2 |
<0.1 |
1.0 |
14.6 |
| Weed free |
33.6 |
11.8 |
35.2 |
- |
- |
- |
- |
- |
| Table 85. Bottineau county weed infestations based on 20 surveyed fields, summer 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
|
55.0 |
31.0 |
56.4 |
10.5 |
19.1 |
0.2 |
3.8 |
73.8 |
| Yellow foxtail
|
55.0 |
19.0 |
34.5 |
12.9 |
23.4 |
0.4 |
7.1 |
67.3 |
| Canada thistle
|
60.0 |
12.5 |
20.8 |
3.4 |
5.7 |
<0.1 |
2.7 |
40.4 |
| Wild oat
|
60.0 |
14.0 |
23.3 |
2.5 |
4.2 |
<0.1 |
2.4 |
39.9 |
| Wild buckwheat
|
50.0 |
14.0 |
28.0 |
2.4 |
4.8 |
<0.1 |
2.3 |
36.3 |
| Kochia
|
50.0 |
8.0 |
16.0 |
1.2 |
2.4 |
<0.1 |
1.6 |
27.4 |
| Common ragweed
|
25.0 |
3.5 |
14.0 |
6.5 |
25.8 |
0.3 |
16.8 |
26.9 |
| Pigweed species |
30.0 |
7.0 |
23.3 |
1.1 |
3.8 |
<0.1 |
1.7 |
19.6 |
| Prickly lettuce |
25.0 |
6.0 |
24.0 |
1.0 |
4.1 |
<0.1 |
1.8 |
16.7 |
| Flixweed/Tansy mustard |
10.0 |
5.0 |
50.0 |
1.0 |
9.7 |
<0.1 |
3.5 |
10.6 |
| Perennial sowthistle |
20.0 |
2.0 |
10.0 |
0.3 |
1.3 |
<0.1 |
1.3 |
9.3 |
| Sunflower
|
15.0 |
3.0 |
20.0 |
0.4 |
2.5 |
<0.1 |
1.3 |
8.9 |
| Common purslane |
10.0 |
2.5 |
25.0 |
0.7 |
7.0 |
<0.1 |
4.0 |
7.5 |
| Quackgrass
|
5.0 |
1.5 |
30.0 |
1.0 |
19.4 |
<0.1 |
10.0 |
5.4 |
| Biennial wormwood |
10.0 |
1.0 |
10.0 |
0.1 |
1.1 |
<0.1 |
1.0 |
4.6 |
| Eastern black nightshade |
5.0 |
1.5 |
30.0 |
0.2 |
4.3 |
<0.1 |
2.0 |
3.7 |
| Common mallow
|
5.0 |
1.5 |
30.0 |
0.2 |
4.3 |
<0.1 |
2.0 |
3.7 |
| Weed free
|
45.0 |
9.0 |
20.0 |
- |
- |
- |
- |
- |
| Table 86. Bowman county weed infestations based on 6 surveyed fields, summer 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 |
18.3 |
27.5 |
10.9 |
16.4 |
0.3 |
4.0 |
66.1 |
| Wild buckwheat
|
50.0 |
11.7 |
23.3 |
1.4 |
2.9 |
<0.1 |
1.3 |
31.7 |
| Russian thistle |
50.0 |
8.3 |
16.7 |
0.9 |
1.8 |
<0.1 |
1.0 |
27.1 |
| Volunteer cereal |
16.7 |
11.7 |
70.0 |
2.9 |
17.2 |
<0.1 |
4.0 |
23.9 |
| Kochia
|
33.3 |
8.3 |
25.0 |
0.9 |
2.7 |
<0.1 |
1.0 |
21.5 |
| Field bindweed
|
33.3 |
5.0 |
15.0 |
0.5 |
1.6 |
<0.1 |
1.0 |
17.4 |
| Safflower
|
16.7 |
6.7 |
40.0 |
0.9 |
5.4 |
<0.1 |
2.0 |
14.3 |
| Wild oat
|
16.7 |
5.0 |
30.0 |
0.7 |
4.3 |
<0.1 |
2.0 |
12.2 |
| Field pennycress |
16.7 |
3.3 |
20.0 |
0.5 |
3.2 |
<0.1 |
2.0 |
10.1 |
| Sunflower
|
16.7 |
1.7 |
10.0 |
0.2 |
1.1 |
<0.1 |
1.0 |
7.6 |
| Prickly lettuce |
16.7 |
1.7 |
10.0 |
0.2 |
1.1 |
<0.1 |
1.0 |
7.6 |
| Pigweed species |
16.7 |
1.7 |
10.0 |
0.2 |
1.1 |
<0.1 |
1.0 |
7.6 |
| Weed free
|
50.0 |
18.3 |
36.7 |
- |
- |
- |
- |
- |
| Table 87. Burleigh county weed infestations based on 8 surveyed fields, summer 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 |
32.5 |
32.5 |
43.9 |
43.9 |
4.4 |
25.5 |
168.2 |
| Wild oat
|
62.5 |
17.5 |
28.0 |
3.6 |
5.8 |
<0.1 |
2.6 |
46.8 |
| Wild buckwheat
|
50.0 |
10.0 |
20.0 |
1.9 |
3.8 |
<0.1 |
1.8 |
31.1 |
| Russian thistle |
50.0 |
6.3 |
12.5 |
0.7 |
1.3 |
<0.1 |
1.0 |
24.5 |
| Canada thistle
|
25.0 |
7.5 |
30.0 |
2.6 |
10.2 |
<0.1 |
5.5 |
21.8 |
| Yellow foxtail
|
25.0 |
2.5 |
10.0 |
0.4 |
1.6 |
<0.1 |
1.5 |
11.8 |
| Pigweed species |
25.0 |
|