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Weed control in Field Pea (2000)
‘Majoret’ peas were seeded
April 28 at 180 lb/A into 6 inch rows in a conventional tillage system.
Individual plots were 10 by 30 ft arrranged in a RCBD with three replicates.
Preplant incorporated (PPI) treatments were applied April 26, preemergence (PRE)
treatments were applied May 3, and postemergence (POST) treatments were applied
on June 2. All treatments were applied with a CO2 pressurized bicycle
sprayer. PPI and PRE treatments were applied with XR80015 flat fan nozzles
delivering 20 gpa at 30 psi. POST treatments were applied using XR8001 flat fan
nozzles delivering 10 gpa at 40 psi. Field peas were harvested on August 1.
|
Treatment |
Rate |
Pea |
Control |
Yield |
Tst Wt |
|
Density |
Injury |
Wibw |
Rrpw |
Kocz |
|
May 26 |
May 25 |
Jul 15 |
Jul 15 |
Jul 15 |
Jul 15 |
| |
|
pl/m |
——%—— |
————%———— |
lb/A |
lb/bu |
| |
|
|
|
|
|
|
|
|
|
|
Untreated |
|
8.9 |
0 |
0 |
0 |
0 |
0 |
3200 |
64.5 |
|
|
|
|
|
|
|
|
|
|
|
|
PPI |
|
|
|
|
|
|
|
|
|
|
Sonalan |
2 pt |
11.7 |
1 |
3 |
90 |
98 |
98 |
3580 |
64.9 |
|
Prowl |
3.6 pt |
|
1 |
0 |
88 |
98 |
98 |
3530 |
64.9 |
| |
|
|
|
|
|
|
|
|
|
|
PPI/POST |
|
|
|
|
|
|
|
|
|
|
Spartan / Assure II |
0.125 lb ai / 7 fl oz |
13.4 |
3 |
0 |
70 |
100 |
100 |
3402 |
64.7 |
|
Spartan / Assure II |
0.25 lb ai / 7 fl oz |
12.2 |
5 |
2 |
90 |
100 |
100 |
3545 |
64.9 |
|
Spartan / Assure II |
0.5 lb ai / 7 fl oz |
10.1 |
9 |
7 |
95 |
100 |
100 |
3515 |
64.6 |
|
Prowl / Raptor + NIS |
3 pt /4 oz + 0.25 % |
|
0 |
3 |
93 |
100 |
98 |
3489 |
64.6 |
|
Handweeded checka |
|
11.1 |
0 |
3 |
99 |
100 |
100 |
3356 |
64.6 |
|
|
|
|
|
|
|
|
|
|
|
|
PRE/POST |
|
|
|
|
|
|
|
|
|
|
Valor / Assure II |
1 oz ai / 7 fl oz |
11.8 |
10 |
4 |
55 |
100 |
100 |
2877 |
64.0 |
|
Valor / Assure II |
1.5 oz ai / 7 fl oz |
9.3 |
12 |
8 |
77 |
100 |
100 |
3169 |
64.5 |
|
Valor / Assure II |
3 oz ai / 7 fl oz |
7.7 |
63 |
20 |
87 |
100 |
100 |
3062 |
65.3 |
|
Spartan / Assure II |
0.125 lb ai / 7 fl oz |
10.5 |
2 |
1 |
73 |
100 |
100 |
3479 |
64.6 |
|
Spartan / Assure II |
0.25 lb ai / 7 fl oz |
12.1 |
8 |
4 |
93 |
100 |
100 |
3528 |
64.4 |
|
Spartan / Assure II |
0.5 lb ai / 7 fl oz |
11.4 |
20 |
7 |
95 |
100 |
100 |
3509 |
64.9 |
|
|
|
|
|
|
|
|
|
|
|
|
POST |
|
|
|
|
|
|
|
|
|
|
Raptor + NIS |
3 oz + 0.25 % |
|
|
4 |
65 |
100 |
82 |
3286 |
64.6 |
|
Raptor + NIS |
4 oz + 0.25 % |
|
|
3 |
80 |
100 |
88 |
3424 |
64.8 |
|
Raptor + Quad 7 |
4 oz + 1 % |
|
|
18 |
73 |
100 |
89 |
2214 |
62.3 |
|
Raptor + Basagran +
NIS + 28% N |
4 oz + 0.5 pt +
0.25 % + 1 qt |
|
|
3 |
89 |
100 |
93 |
3375 |
64.7 |
|
Raptor + Basagran +
NIS + 28% N |
4 oz + 1 pt +
0.25 % + 1 qt |
|
|
2 |
90 |
100 |
93 |
3464 |
64.6 |
|
Basagran + Poast |
2 pt + 1 pt |
|
|
4 |
82 |
87 |
93 |
3332 |
64.3 |
|
Starane +
Assure II + NIS |
0.5 oz ai +
7 fl oz + 0.25 % |
|
|
29 |
55 |
43 |
100 |
2633 |
64.2 |
|
Starane + Basagran +
Poast |
0.5 oz ai + 1 pt +
1 pt |
|
|
32 |
84 |
82 |
100 |
2652 |
64.4 |
|
LSD |
|
3 |
5 |
6 |
14 |
4 |
4 |
459 |
NS |
|
CV |
|
16 |
29 |
50 |
11 |
3 |
3 |
9 |
1.2 |
a Treflan was applied at 1.5 pt/A (PPI),
followed by Assure II at 7 fl oz (POST).
We evaluated pea tolerance to Spartan, Valor, and Raptor compared to other
herbicides. Spartan caused only slight injury at any rate or application timing
and did not reduce crop yield. Valor caused moderate to severe injury at the
high rate and reduced yield approximately 200-500 lbs. Raptor plus Quad 7 caused
moderate visible crop injury and a significant yield reduction.
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