integrated weed management - dphu · integrated weed management fabián menalled 719 leon johnson...
TRANSCRIPT
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12 miles West of Hardin, MT
November 18, 2007
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12 miles West of Hardin, MT
November 18, 2007
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Outline for TodayOutline for Today’’s Lectures Lecture
• Review of concepts – What is a weed?
– Why do we have weeds?
• Conventional approaches to weed management– Limitations
• Introduction to Integrated Weed Management (IWM)
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Source: WSSA web site. Ian Heap
What is a Weed?
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What is a Weed?What is a Weed?A plant that is growing where it is not wanted
Roberts et al. 1982. Weed Control Handbook
Weed science focuses on mitigating the negative impacts of weeds on crops
Landis et al. 2005. Weed Science
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Weed Management is Achieved ThroughWeed Management is Achieved Through
USDA Online Photography
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Problems With Conventional Weed ManagementProblems With Conventional Weed Management• Unintended effects
• Erosion – mechanical control-
• Soil and groundwater contamination –chemical control-
• Weed resistance
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Herbicide Resistance is NOT due to
1. Sprayer skips or plugged nozzles
2. Weather problems that cause poor control
3. Plants that are ‘naturally tolerant’ to the herbicide
4. Genetic changes caused by the herbicide
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Herbicide Resistance isThe ability of a plant to survive and reproduce after treatment with a dose of herbicide that would normally kill the plant
SusceptibleResistant
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The sky is falling!
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Herbicide Resistance
USA = 114Australia = 48Canada = 44France = 30Spain = 27UK = 24
311 Resistant Biotypes, 183 Species (110 dicotsand 73 monocots) as of October 3rd, 2006Source: International Survey of Herbicide Resistant Weeds (http://www.weedscience.org)
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Herbicide Resistance in Montana
Wild oat
Russian thistle
Green foxtail?
Kochia
Persian darnel
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History of Wild Oat Resistance in Montana
Uxz|ÇÇ|Çz Éy g|Åx
1990sResistance to Far-go
Early 1990sAssert
1996Resistance to Assert
2000sMultiple resistance (Far-go, Avenge &
Assert)
1970Far-go
2004
ACCase Cross Resistance
(Hoelon, Puma, Discover)
2006
Resistance to Axial
Avenge
Multiple Resistance (Avenge and Far-go)
2005
Axial
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0x
1x
0.06x 0.125x 0.25x 0.5x
2x 8x4x
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Where do Resistant Weeds Come From?
One in one million, billion, trillion….?
It’s all about selection…..
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DNA
Resistance passed on to next generation
Herbicide application: selection pressure for resistant plants
Succeeding generations are also resistant
Herbicide application: selection pressure
Reproduction (sets seeds)DNA mutation: allows resistance
to a herbicide
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Selection Pressure and Resistance
“Better”herbicide =
more chance of selecting for resistance
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How Can We Prevent the Selection of Resistant Biotypes?
“Better”herbicide =
more chance of selecting for resistance
Don’t rely just on that “great” herbicide
Incorporate other mortality factors:
* Herbicides
* Mechanical practices
* Cultural practices
* Biological factors
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Problems With Conventional Weed ManagementProblems With Conventional Weed ManagementUnintended effects
• Erosion – mechanical control-
• Soil and groundwater contamination –chemical control-
• Weed resistance
• We are living in a changing world
• Global climate change
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Percent Soil Moisture Reduction June-August
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Percent Increase in total biomass at 54 DAS
Ziska, Weed Sceince 2003
Growth Response, Past to Present [CO2]
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McPeek and Wang 2007. Weed Science 55: 334-340
AmbientElevated
Elevated [CO2] Enhances Dandelion Reproduction
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McPeek and Wang 2007. Weed Science 55: 334-340
Elevated [CO2] Enhances Dandelion Reproduction
AmbientElevated
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Who cares? We still got herbicides
Source: USDA photo gallery
Can changes in [CO2] and To
affect chemical control?
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Growth Following Herbicide Application- Greenhouse -
Glyphosate
-0.2
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
Low (365) High (723) Low (365) High (723) Low (388) High (721)
C. lambsquarters Redroot pigweed Quackgrass
Grow
th (g
/day
)
* **
* = Death plant
After Ziska and Teesdale, 2000
[CO2] [CO2] [CO2]
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Finale (Glutamine synthase inhibitor)
• To and CO2 – Reduce efficacy
0
20
40
60
80
100
23C 26C 29C 23C 26C 29C
Ambient CO2 Ambient CO2 + 160ppm CO2
Effi
cacy
(%)
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Problems With Conventional Weed ManagementProblems With Conventional Weed ManagementUnintended effects
• Erosion – mechanical control-
• Soil and groundwater contamination –chemical control-
• Weed resistance
We are living in a changing world
• Cropping systems highly simplified and predictable
• Weeds with biology similar to crop are difficult to control (we’ll talks about this on Wednesday)
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Problems With Conventional Weed ManagementProblems With Conventional Weed ManagementUnintended effects
• Erosion – mechanical control-
• Soil and groundwater contamination –chemical control-
• Weed resistance
We are living in a changing world
Simplified and predictable
• Weeds with biology similar to crop are difficult to control (we’ll talk about this on Wednesday)
• On the long-term, large hammers evidently don’t work:
We still have weed problems!
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What is a Weed?What is a Weed?A plant that is growing where it is not wanted
Roberts et al. 1982. Weed Control Handbook
Weed science focuses on mitigating the negative impacts of weeds on crops
Landis et al. 2005. Weed Science
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Any Problem with this Definition?Any Problem with this Definition?
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What is a Weed?What is a Weed?A plant that is successful in colonizing disturb, but potentially productive sites and at maintaining their abundance under conditions of repeated disturbances
Mohler C., 2001. Ecological Management of Agricultural Weeds
Search the causes of why we have weeds
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DisturbanceDisturbance• A discrete event that disrupts ecosystem,
community or population structure
• Changes resources, substrate availability or the physical environment
Pickett and White, 1985Pickett and White, 1985
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USDA Online Photography
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LightLight
WaterWater
NutrientsNutrients
SpaceSpace
Why Do We Have Weeds?Disturbance
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Why Do We Have Weeds?
BECAUSE WE CREATE BECAUSE WE CREATE THE ENVIROMENTS THE ENVIROMENTS
WHERE WEEDS WHERE WEEDS THRIVE!THRIVE!
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Weed Management is Achieved ThroughWeed Management is Achieved Through
USDA Online Photography“large hammer”
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Alternative Approach to Alternative Approach to Weed ManagementWeed Management
• Replace a “few large hammer” with “many little hammers” (herbicides, tillage, crop rotation, pathogens, insects, cover crops, etc)
• Alone, each factor may have a small effect. Together, these factors may provide sufficient control
Liebman and Gallandt 1997
Integrated Weed Management
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Integrated Weed ManagementIntegrated Weed Management
> Chem.Mech.+ +Cultural
CulturalMechanical
Chemical
BiologicalBiol. +
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Integrated Weed ManagementIntegrated Weed Management
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Integrated Weed Management
- 2nd Lecture -
Fabián Menalled
719 Leon Johnson HallMontana State [email protected]
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A Brief Summary A Brief Summary • Problems with traditional approaches to weed management.
• Among others:
• Resistance
• Global climate change
• Definition of a weed
• Plants that thrive in frequently disturbed environments
• Understand why we have weeds
• Replace a “few large hammers” with “many little hammers”
• Develop and Integrated Weed Management program
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Integrated Weed ManagementIntegrated Weed Management
> Chem.Mech.+ +Cultural
CulturalMechanical
Chemical
BiologicalBiol. +
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Integrated Weed ManagementIntegrated Weed Management
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Integrated Weed ManagementIntegrated Weed Management
• Set of cultural, mechanical, biological and chemical control practices to– Limit the introduction and spread of weeds
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PreventionPrevention• Plant clean and certified seed• Clean equipment between fields• Manage buffer areas and field margins • Prevent seed production by established weed
populations
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Standard weed management conducted at the field level
270% expansion over 6 years
Standard weed management + weed shed prevention
24% expansion over 6 yearsAfter H. After H. BeckieBeckie, , AgriAgri--Food Canada @ SaskatoonFood Canada @ Saskatoon
1997 2002
1997 2002
Do Not Spread Weed Seeds!Do Not Spread Weed Seeds!
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Integrated Weed Management
• Set of cultural, mechanical, biological and chemical control practices to– Limit the introduction and spread of weeds– Help the crop compete with weeds
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LightLight
WaterWater
NutrientsNutrients
SpaceSpace
Disturbance
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Goal• Manage cropping systems (not
just weeds!) so that the resources made available through disturbances are captured by crop and not by weeds
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Weed Management
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Weed Management
Herbicides
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Weed Management
Herbicides
Crop rotation
Crop variety
Time of emergence
Seeding densityRow spacing
Resource management
Time of control
Integrated Weed Management
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Persian darnel density (seedlings/m2)
Spring
Whe
at Y
ield (kg
/ha)
0
1000
2000
3000
4000
5000
6000
0 500 1000 1500 2000
1X Seed Rate1.5X Seed Rate2X Seed Rate
Spring Wheat Yield ResponseSpring Wheat Yield ResponseAfter Holman and BussanAfter Holman and Bussan
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Crop Seed SizeCrop Seed Size
Stougaard and Xue. 2004. Weed Sciences 52: 133-141
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Relative Time of Emergence
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Row Spacing and Seeding Rate20 site-years in Oklahoma
---- 60 lb/A ---- ---- 120 lb/A ----
Epplin et al. 1996
0
5
10
15
20
25
30
35
Whe
at y
ield (Bu
/A)
9 3 9 3
Row spacing (inches)
Weed Free
Cheat
-- 60 lb/A -- -- 120 lb/A --
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N Placement on Downy BromeWyoming
0200400600800
100012001400
No.
or l
b/ac
re
Plants Dry wt.Downy brome
BdcstBand
Miller 1990
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A Tricky Question
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Moccasin, MT
January 13, 2006• Late but appropriate weather conditions
• Winter wheat: 3 - 4 leaf stage• Downy brome 3 - 4 leaf to 2 - 5
tiller growth stageMoccasin
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1. Untreated – control-2. Oly 0.61 oz/A – Fall3. Oly 0.61 oz/A – Fall + Oly 0.61 oz/A – Spring4. Oly 0.61 oz/A – Fall + OlyFlex 3.5 oz/A – Spring
0
20
40
60
80
100
1 2 3 4 5 6 7 8 9Treatment
% C
ontr
ol
d
abc
c
aba ab
c cbc
5.Oly 0.61 oz/A – Fall + Osprey 3.2 oz/A – Spring6. OlyFlex 3.5 oz/A - Fall7. OlyFlex 3.5 oz/A – Fall + Osprey 3.2 oz/A - Spring8. Maverick 0.5 oz/A Fall9. Maverick 0.66 oz/A Spring
Downy Brome Control in Winter Wheat
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1. Untreated – control-2. Oly 0.61 oz/A – Fall3. Oly 0.61 oz/A – Fall + Oly 0.61 oz/A – Spring4. Oly 0.61 oz/A – Fall + OlyFlex 3.5 oz/A – Spring
5.Oly 0.61 oz/A – Fall + Osprey 3.2 oz/A – Spring6. OlyFlex 3.5 oz/A - Fall7. OlyFlex 3.5 oz/A – Fall + Osprey 3.2 oz/A - Spring8. Maverick 0.5 oz/A Fall9. Maverick 0.66 oz/A Spring
Winter Wheat Yield
0
5
10
15
20
25
30
1 2 3 4 5 6 7 8 9Treatment
%Yi
eld
(bu
/A)
No significant differences between treatmentsNo fertilization: yield potential may not have been realized
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Integrated Weed ManagementIntegrated Weed Management
• Set of cultural, mechanical, biological and chemical control practices to– Limit the introduction and spread of weeds– Help the crop compete with weeds– Keep weeds "off balance"
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fallowfallow wheatwheat fallowfallow wheatwheat fallowfallow wheatwheat
Cheatgrass
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Crop RotationCrop Rotation
“Rotation of crops, when accompanied by care in the use of pure seed, is the most effective means yet devised for keeping land free of weeds.”
Leighty (1938)
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Crop Rotation and Cheatgrass Density
Dow
ny b
rom
e de
nsit
y (n
o. m
-2)
(After Blackshaw 1994)
0
200
400
600
800
1000
1200
1987 1988 1989 1990 1991 1992 1993 1994Year
Wheat-rapeseed, no-till Wheat-rapeseed, tillContinuous wheat, no-till Continuous wheat, till
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J F M A M J J A S O N D
Year 1 – W. Wheat-
J F M A M J J A S O N D
Year 2 – Chem. Fallow-
J F M A M J J A S O N D
Year 3 – W. Wheat -
J F M A M J J A S O N D
Year 4 – Chem. Fallow-
J F M A M J J A S O N D
herbicide canopy
J F M A M J J A S O N D
Year 1 - W. Wheat -
Year 3 – Hay Barley -
Year 2 – Ch. Pea-
J F M A M J J A S O N D
Year 4 – Chem. Fallow -
J F M A M J J A S O N D
Overall Impact
J F M A M J J A S O N D
Overall Impact
J F M A M J J A S O N D
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Year 2 – Chem. Fallow-
J F M A M J J A S O N D
Year 3 – W. Wheat -
J F M A M J J A S O N D
Year 4 – Chem. Fallow-
J F M A M J J A S O N D
Year 2 – W. Wheat-
J F M A M J J A S O N D
Year 3 – Lentils -
J F M A M J J A S O N D
Year 4 – Barley -
J F M A M J J A S O N D
Overall Impact
J F M A M J J A S O N D
Year 1 – W. Wheat-
J F M A M J J A S O N D
herbicide canopyYear 1 - W. Pea -
J F M A M J J A S O N D
cultivation
Overall Impact
J F M A M J J A S O N D
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In SummaryIn Summary• Why we have weeds?
– Disturbances, resources, & propagules
• Integrate “many little hammers”• Goals of Integrated Weed Management
– Limit the introduction and spread of weeds• Prevention
– Help the crop • Resource competition
– Keep weeds "off balance“• Crop rotation
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Question?