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Weed control in dry bean (2001)
Maverick pinto beans were seeded June 2 into 30-inch rows at 60 lb/A in a
conventional tillage system. Individual plots were 10 x 30 ft and replicated
three times. Treatments were applied preplant incorporated (PPI) or
preemgergance (PRE) on June 2, or postemergence (POST) on July 9 (0-2 lf), or
July 23 (POST 2). The primary weeds were biennial wormwood (Biww) and kochia (Kocz).
Table 1. Control of biennial wormwood and kochia in dry bean.
| |
|
|
Biww |
Kocz |
|
|
| Treatmenta |
Rate |
Timing |
Jul 5 |
Aug 15 |
Jul 5 |
Aug 15 |
Yield |
Test wt. |
| |
|
|
———— % control ———— |
lb/A |
lb/bu |
| Spartan |
2.67 oz |
PRE |
87 |
70 |
97 |
96 |
1508 |
58.7 |
| Spartan |
5.33 oz |
PRE |
98 |
89 |
100 |
100 |
1407 |
57.5 |
| Spartan |
10.66 oz |
PRE |
100 |
97 |
100 |
98 |
1412 |
58.2 |
| Broadstrike + Dual |
2 pt |
PPI |
93 |
77 |
25 |
0 |
844 |
55.3 |
| Python |
1 oz |
PPI |
96 |
84 |
22 |
3 |
891 |
59.5 |
| Sencor |
0.33 lb |
PRE |
95 |
84 |
94 |
83 |
1420 |
58.0 |
| Valor |
3 oz |
PRE |
100 |
96 |
98 |
84 |
1367 |
57.6 |
Basagran /
Basagran |
1 pt /
1 pt |
POST /
POST 2 |
|
92 |
|
92 |
1907 |
58.0 |
| Basagran |
2 pt |
POST |
|
78 |
|
91 |
1638 |
57.3 |
| Spartan + Sencor |
5.33 oz + 0.25 lb |
PRE |
100 |
95 |
100 |
100 |
1589 |
57.8 |
| Basagran + Raptor |
1 pt + 4 fl oz |
POST |
|
73 |
|
80 |
1966 |
58.8 |
| Treflan |
1.5 pt |
PPI |
|
0 |
|
25 |
1078 |
58.7 |
| Untreated |
|
|
0 |
0 |
0 |
0 |
861 |
58.6 |
| LSD |
|
|
6 |
20 |
5 |
16 |
440 |
NS |
| CV |
|
|
4 |
17 |
4 |
15 |
19 |
3 |
a Raptor was applied with NIS at 0.25% and 28% N
at 1 qt.
Table 2. Dry bean injury from soil-applied herbicides.
| |
|
|
Soil pH |
% Crop injury |
Yield, lb/A |
| Treatmenta |
Rate |
Timing |
Rep 1a |
Rep 2&3 |
Rep 1 |
Rep 2&3 |
Rep 1 |
Rep 2&3 |
| Spartan |
2.67 oz |
PRE |
7.8 |
6.0 |
30 |
4 |
1158 |
1683 |
| Spartan |
5.33 oz |
PRE |
7.8 |
5.1 |
50 |
5 |
829 |
1696 |
| Spartan |
10.66 oz |
PRE |
7.9 |
5.1 |
70 |
8 |
689 |
1774 |
| Sencor |
0.33 lb |
PRE |
6.3 |
5.2 |
50 |
19 |
1292 |
1405 |
| Valor |
3 oz |
PRE |
7.0 |
6.0 |
35 |
15 |
1454 |
1403 |
| Spartan+Sencor |
5.33 oz + 0.25 lb |
PRE |
5.5 |
5.6 |
15 |
11 |
1387 |
1691 |
a Rep = replication; each treatment is applied to
three 10 by 30 ft blocks or replications.
Spartan, Broadstrike, Python, Sencor, Valor, and Raptor are not registered
for use in dry bean as of late 2001. Spartan and Raptor are likely to be labeled
for use in dry bean in ND in the future. In this study, Spartan, Sencor, Valor,
and Basagran provided good to excellent kochia control. With the exception of
Treflan, all treatments provided fair to excellent control of biennial wormwood.
We observed more crop injury in the 1st replication (rep) compared
to reps 2 and 3. We found that the soil in rep 1 was higher in soil pH, which
likely contributed to the higher crop injury. Spartan and Sencor will be more
active as soil pH increases, thus increasing the chance of crop injury.
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