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Weed control and crop
tolerance to herbicides in conventional-till dry pea (Minot 2004).
Majoret dry pea was
direct seeded April 26 into wheat stubble at 120 lb/A into 7.5-inch rows.
Individual plots were 10 x 30 ft and replicated three times. Preemergence (PRE)
and postemergence (POST) herbicides were applied May 4 and June 17,
respectively. The study was conducted on a loam soil with pH 4.7 and OM 3.1%.
The primary weeds present were green and yellow foxtail (Fxtl), redroot pigweed
(Rrpw), and wild buckwheat (wibw).
None of the treatments
significantly reduced crop density compared to the untreated. There was minimal
injury from Spartan even at the higher rates. Sencor + Sonalan and Basagran
caused moderate visible crop injury, there was no significant yield reduction
from any treatment. However, there was wide variability in yield between reps
due, in part, to dry conditions in early May and a hail storm on June 6 that may
have caused significant crop injury. Even though there was no statistical
difference in yield, there was a trend for higher yield in the treatments
containing Spartan.
Spartan + Select provided
excellent control of foxtail, pigweed, and wild buckwheat. Prowl followed by
Raptor provided good control as well. Spartan treatments generally provided
10-20% better control of wild buckwheat than other treatments. Foxtail control
was slightly better with treatments containing Select compared to other
treatments.
|
|
|
|
Dry pea |
Yield |
TW |
Fxtl |
Rrpw |
Wibw |
|
Treatment |
Rate |
Timing |
Jun 3 |
Jul 10 |
Aug 17 |
Jun 14 |
Jul 10 |
Jun 14 |
Jul 10 |
Jun 14 |
Jul 10 |
|
|
|
|
#/m row |
% inj |
lb/A |
lb/bu |
% control |
|
Prowl H20/
Raptor +
NIS + 28% N |
2 pt/
4 oz +
0.25% v/v + 1
qt |
PPI/
POST
|
8.0 |
4 |
1885 |
65.1 |
79 |
97 |
72 |
98 |
65 |
87 |
|
Raptor +
Basagran +
NIS + 28% N |
4 oz +
0.5 pt +
0.25% v/v + 1
qt |
POST
|
9.5 |
7 |
2053 |
65.3 |
0 |
83 |
0 |
93 |
0 |
79 |
|
Spartan/
Select + COC |
2.67 oz/
5 fl oz + 1%
v/v |
PRE/
POST |
8.2 |
1 |
2252 |
65.4 |
85 |
94 |
97 |
100 |
97 |
96 |
|
Spartan/
Select + COC |
4 oz/
5 fl oz + 1%
v/v |
PRE/
POST |
8.2 |
4 |
2397 |
65.4 |
92 |
97 |
100 |
100 |
98 |
99 |
|
Spartan/
Select + COC |
5.33 oz/
5 fl oz + 1%
v/v |
PRE/
POST |
7.5 |
4 |
2207 |
65.1 |
93 |
96 |
100 |
100 |
100 |
98 |
|
Sonalan + Sencor/
Select + COC |
2 pt + 0.33 lb/
5 fl oz + 1%
v/v |
PPI/
POST |
8.5 |
23 |
2156 |
64.9 |
92 |
99 |
88 |
94 |
68 |
80 |
|
Spartan/
Basagran +
Poast + COC |
2.67 oz/
1 pt +
1 pt + 2 pt |
PRE/
POST
|
7.8 |
13 |
2470 |
65.2 |
73 |
87 |
100 |
100 |
100 |
98 |
|
Basagran +
Poast + COC |
2 pt +
1 pt + 2 pt |
POST
|
8.7 |
19 |
1804 |
65.2 |
0 |
77 |
0 |
88 |
0 |
76 |
|
Sonalan + Spartan/
Select + COC |
2 pt + 4 oz/
5 fl oz + 1%
v/v |
PPI/
POST |
8.9 |
1 |
2484 |
65.4 |
96 |
99 |
100 |
100 |
98 |
96 |
|
Handweeded checkb |
|
8.3 |
0 |
2654 |
65.5 |
89 |
99 |
87 |
100 |
73 |
99 |
|
Untreated |
|
|
9.6 |
0 |
1672 |
64.6 |
0 |
0 |
0 |
0 |
0 |
0 |
|
LSD (0.05) |
|
|
NS |
6 |
NS |
NS |
5 |
5 |
8 |
5 |
6 |
8 |
|
CV |
|
|
11.3 |
49 |
19 |
0.6 |
5 |
4 |
7 |
4 |
5 |
6 |
bTreflan was
applied at 2 pt/A PPI followed by Select plus COC at 5oz/A + 1% v/v POST to aid
handweeding.
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