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New rice weed control products
deliver a new mode of action and a
new site of action
Jim Heiser
Sr. Research Associate – Weed Science
What is TRUELY new?
Mode of action– How an A.I. works
Site of Action– Where it works
No new MOA’s since HPPDs – 20 MOA’s utilized
– Any others available?
– Rice development lags
What is TRUELY new?
Benzobicyclon– HPPD
– Asian rice 20+ yrs. of HPPD
– Very good control
– Broad spectrum
Needs established flood
Rogue and Rogue Plus– SC alone, WDG premix with Permit
What does it offer?
Broad spectrum control or suppression– Aquatics
• Ducksalad, mudplantain, arrowhead, redstem
– Sedges• Umbrella, flat**, yellow**
– Broadleaves• Coffeebean*, jointvetch*
– Grasses• Sprangletops, Barnyardgrass**
*Rogue Plus **ALS Resistant Suppression
How do we utilize it?
Established flood– Water seeded
– POST-flood drill
seeded
Must maintain flood– “Water line to water
line”
– Deeper is better
– Side inlet
Carryover a concern– Continuous rice
2018 registration
How do we utilize it?
Rogue SC
– 8.4-12.6 fl. oz./ac.
Rogue PLUS
– 0.33-0.5 lb./ac.
Unique MOA for rice
More convenient
formulations?
Weedy Rice Control?
•An unexpected observation took place on July 16, 2015. Benzobicyclon controlled weedy rice.
Weedy Rice ControlRREC 6 WAT
Nontreated Benzobicyclon 494 g ai/ha
Weedy Rice ControlRREC 9 WAT
A A
0
20
40
60
80
100
247 494
%
Co
ntr
ol
Benzobicyclon Rate (g ai/ha)
Rough Rice Yield
A A
A
aa a
0
2000
4000
6000
8000
10000
nontreated 247 494
Colt
Yie
ld (
kg/h
a)
Benzobicyclon Rate (g ai/ha)
Rough Rice Yield
A A
A
aa a
0
2000
4000
6000
8000
10000
nontreated 247 494
Colt
Yie
ld (
kg/h
a)
Benzobicyclon Rate (g ai/ha)
Dockage
As a result…..
• Prompted a greenhouse evaluation of benzobicyclon control of weedy rice
• Approximately 145 accessions • Arkansas (Jason Norsworthy,
Mason Young)• Mississippi (Jason Bond)• Missouri
Weedy Rice Diversity
HullAwn
Not present Present Total
Straw 44.5% 11.0% 55.5%
Black 0.7% 24.7% 25.3%
Mixed 0.7% 18.3% 19.2%
Total 45.9% 54.0% 100%
Conclusions
• There is much genetic and phenotypic diversity across weedy rice populations across the Midsouth
• Benzobicyclon has controlled ALS-resistant weedy rice in a field and greenhouse environment
• More research needs to be conducted to investigate weedy rice tolerance to benzobicyclon
What is TRULY new?
Florpyrauxifen-benzyl– Loyant with Rinskor active
– Synthetic Auxin• New structural class
• Aryl-picolinate
– New SOA• Controls Facet resistant species
• Broad spectrum
• Unique symptomology
What does it offer?
– Grasses• Signalgrass,
barnyard, panicum• Suppression of
sprangletops• No crabgrass activity
– Sedges• Yes (even ALS
resistant biotypes)
– Aquatics• Great on what we
commonly have
– Broadleaves• Fair on smartweed,
excellent on others
Broad Spectrum control or suppression
What does it offer?
Ease of use– One use rate
– 2 leaf rice to 60 day PHI
– Compatibility with (almost) everything• Quizalofop in Provisia Rice
• NewPath in Clearfield Rice
• Name a residual…
• But not Propanil
How do we utilize it?
Early POST– Great on Pigweed - ROW RICE?– “Smooth” Morningglories– Include a residual – Good moisture
Pre-Flood– Can flood the same day– Short spray to flood interval = better control
Two applications allowed– ≥14 days apart– Add 0.5 pt/ac MSO
How do we utilize it?
While very broad spectrum…– Utilize Clincher or Ricestar for resistance
management
– Better sprangletop control
EPOST needs a residual– Resistance management
– Delays in flood establishment
Untreated Loyant 10 DAT Londax 10 DAT
What to Expect
EPOST symptoms
– Typical auxin symptoms
– Grasses still green…but no growth
– Dead roots
Post-flood
– Swollen lower grass nodes
– Break off and float when you walk by
What to Expect
But Jim, It’s an auxin like 2,4-D and
Dicamba…what about off target
movement?– NO volatility
– WILL DRIFT
– BROADLEAVES vulnerable
– Directional precautions
– Overlaps show no cause for concern
Limited availability expected in 2018
Use Precautions DO NOT
– Allow runoff– Tank mix with parathion or apply within 7
days of parathion applications– Allow drift or mist on to most broadleaf crops
or trees– Let tank mixes sit overnight– Apply through any type of irrigation system – Tank mix with propanil– Apply in less than 10 gpa by land or air
equipment.
See label for all use requirements
Non-GMO Herbicide Resistant Rice
– ACCase resistant
– Quizalofop-p-ethyl
Will NOT be stacked with Clearfield
– Use WITH Clearfield
– Provisia/Clearfield/Rotational Crop
– Escapes and outcrossing
Provisia Rice-BASF
1◦ - Red Rice, 2◦ - other grasses
Not cross tolerant to other graminicides
– Poast, Select, Fusilade
– Can still use Clincher, Ricestar HT
Provisia Rice-BASF
Sequential applications
– One shot ≠ season long control
Very good control of non-Provisia and weedy (red) rice
– Drift issue in future?
– Already familiar with
Clearfield symptoms
– ACCase symptoms
very easy
Provisia Rice-BASF
Not as flexible as Clearfield
Antagonism when tank-mixed
– More trips?
– Facet, Sharpen
pH of solution also a concern with graminicides
Too late?
Provisia Rice-BASF
Other new Products
RiceOne CS– Clomozone +
Pendimethalin
– 2.56 lb./gal +
1.07 lb./gal
– Great in delayed
PRE and EPOST
Command
3ME
fl oz/Ac
Prowl
H2O
fl oz/Ac
RICEONE
CS
fl oz/Ac
8.64 16.17 24
10.8 20.21 30
11.52 21.56 32
12.6 23.58 35
13.32 24.93 37
14.4 26.95 40
15.12 28.29 42
15.84 29.64 44
16.56 30.99 46
17.28 32.34 48
18 33.68 50
Other new Products
Gambit– Permit + Peak
• Control/suppression of 52 more species than
Permit Plus
– Arrowhead, redstem POST, eclipta,
mudplantain PRE
• Rice, Sorghum, Corn, Millet
• 1 oz = 0.67 oz Permit + 0.5 oz Peak
• Plant back of 10m for STS, 18m non-STS
– BOLT Soybeans?
Other new Products
Typical timings
– EPP with Sharpen
– Burndown with Glyphosate
– Early POST with Command
– Pre-flood cleanup on larger weeds
Large weeds/perennials may require
sequential applications
Cory Cross - Research Specialist
Ralph Tanner - Research Lab Technician
Chase Gaines - Intern
Brock Blakey - Summer Worker
Use of products and trade names does not constitute
a guarantee or warranty of the products named and
does not signify that these products are approved to
the exclusion of comparable products. Use of trade
names does not imply an endorsement by the
University of Missouri or by an employee of the
University of Missouri. It is always the pesticide
applicator's responsibility, by law, to read and follow
all current label directions for the specific pesticide
being used. The author, The University of Missouri,
College of Agriculture, Food and Natural Resources ,
Division of Plant Sciences, and University of Missouri
Extension assume no liability resulting from the use
of information herein.
