Post Emergent Soybeans Session - Nichino America - David King.pdfPost emergent Soybeans •...
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Post Emergent Soybeans David King SW LA Byrne Carpenter Mid-South, NE LA
Transcript of Post Emergent Soybeans Session - Nichino America - David King.pdfPost emergent Soybeans •...
Post Emergent Soybeans
David KingSW LA
Byrne CarpenterMid-South, NE LA
Post emergent Soybeans
• Registration received in 2009
– ET at 0.75 fl oz– ET at 0.75 fl oz
–Original application timing to V2
• 2011 to V6
When Can I Use ET?
• ET can be used post emergent from crop emergence
to the V6 growth stage.DO NOT APPLY ET
ONCE FLOWERING
HAS BEGUN
What Does a V6 Soybean Look Like?
5
6
12
3
4
12 to 14 inches tall
60
70
80
90
100
ET @ 1 oz/acre + COC 1%
Bullgrass
Barnyrd grass
Sicklepod
0
10
20
30
40
50
60
10 DAT 17 DAT
Coffeebean
Carelessweed
Morningglorry pitted
Morningglory entireleaf
Miller, LSU 2004
ET control of Teaweed (Prickly sida)
40
60
80
100
120
Pe
rce
nt
Co
ntr
ol
Glyphosate 22 oz + NIS
Glyphosate 22 oz + ET .75 oz + NIS
Better Weed Control with ET
0
20
40
Pe
rce
nt
Co
ntr
ol
Glyphosate 22 oz + ET .75 oz + NIS
* Data shown is a compilation of 5 trials in LA, MO, VA, IN, IL completed between 2005 and 2009.
CONTROL OF GLYPHOSATE RESISTANT
Palmer amaranth
50
60
70
80
90
100
% C
on
tro
l
Untreated
RPM 24 fl oz
* Data shown is a compilation of 5 trials in LA, MO, VA, IN, IL completed between 2005 and 2009.
b b
b
0
10
20
30
40
50
7 DAT 14 DAT 21 DAT
% C
on
tro
l
RPM 24 fl oz + ET 0.75 fl oz
RPM 24 fl oz + Reflex 16 fl oz
RPM 24 fl oz + Reflex 16 fl oz
+ ET 0.75 fl oz
Better Weed Control with ET
50
60
70
80
90
100
Me
an
% C
on
tro
l
Roundup PM 24 fl oz
Roundup PM 24 fl oz +
0
10
20
30
40
50
9 DAA 15 DAA
Me
an
% C
on
tro
l
Roundup PM 24 fl oz +
Fomesafen 16 oz
Roundup PM 24 fl oz +
Fomesafen 16 fl oz + ET
0.75 fl oz
David Jordan NCSU
Mt. Olive 2010
ET 0.75 fl oz + 32 oz Roundup + NIS
Excellent Morningglory
control with great crop
safety.
• Post emergent applications of ET will typically
cause some temporary herbicidal speckling
that is transient, and will not appear on new that is transient, and will not appear on new
growth.
ET 0.75 fl oz + 32 fl oz Loaded Roundup
3 DAA
7 DAA
32 DAA
42 DAA
• Poor weed control has the greatest effect on yield
• ET only causes temporary speckling
“..50% leaf defoliation
at the V6 stage would
cause, at most, a 3%
loss in yield”.
D.A. McWilliams, D.R. Berglund, G.J. Endres
North Dakota State University and University of Minnesota
26.3
23.6
20
25
30
35
Yie
ld B
u/A
Soybean Yield
ET 0.75 fl oz + Roundup
Original Max 22 fl oz
Additional 2.3 Bu/A
yielded when ET
added to Roundup
0
5
10
15
Yield Bu/A
Yie
ld B
u/A
Original Max 22 fl oz
Roundup Original Max
22 fl oz
Henry Wilson 2005
Painter, VA
Recommendation
For faster and broader control of
tough broadleaf weeds including Roundup tolerant
• ET 0.75 fl oz + Roundup 32 fl oz + NIS 0.25%
or with residual
• ET 0.75 fl oz + Fomesafen 16 fl oz +
Roundup 32 fl oz + NIS 0.25%
ET IN CROP FOR SOYBEAN WEED CONTROL
• ET can be safely applied to soybeans in crop
up to V6.up to V6.
• Applications over the top will speckle the
exposed leaves with subsequent growth
unaffected.
