Slide Presentation
TITLE
(click title to view slides)
Roundup Ready Cotton Tolerance to Glyphosate
AUTHOR
Dr. Stanley Culpepper
Extension Weed Specialist
University of Georgia
Tifton, GA
DOWNLOAD
Slide Presentation (PowerPoint, 10.2 MB)
TABLE OF CONTENTS
Roundup Ready Cotton Tolerance to Glyphosate
Glyphosate Overtop Prior to 5th Leaf
Glyphosate Overtop After 4th Leaf?
Lint Cotton Yields in RR Cotton when Treated Topically with Glyphosate
Lint Yields (Nodes 5-14) in RR Cotton when Treated Topically with Glyphosate
Unopened Bolls in RR Cotton when Treated with Glyphosate
Glyphosate comparison picture
Glyphosate Overtop after 4th Leaf Stage
Is Stem Absorption of Glyphosate Directed in RR Cotton a Concern?
Precision PD or hooded sprayers - Picture
Direct spray to the base of the cotton plants
Direct spray to the base of the cotton plants - Picture
Contact of spray with cotton leaves should be avoided
Sprayer Picture
Sprayer Picture
Sprayer Picture
Sprayer Picture
Sprayer Picture
Place nozzles in low position
Sprayer Picture
Sprayer Picture
Sprayer Picture
Cotton Yield After Various Glyphosate Applications. Moultrie, 2000.
Number of Bolls on Nodes 5-10 After Various Glyphosate Applications. Moultrie, 2000.
Boll Weights from Nodes 5-10 After Various Glyphosate Applications. Moultrie, 2000.
Number of Bolls on Nodes After Various Glyphosate Applications. Moultrie, 2000.
Boll Weights from Nodes After Various Glyphosate Applications. Moultrie, 2000.
Number of Vegetative Bolls After Various Glyphosate Applications. Moultrie, 2000.
Vegetative Boll Weights After Various Glyphosate Applications. Moultrie, 2000.
Precision and Sloppy applied Glyphosate - Picture
Precision and Sloppy applied Glyphosate - Picture
Directing after 4-leaf stage?
Directing after 4-leaf stage?
Cutleaf Eveningprimrose
Cutleaf Eveningprimrose Response to Burndown Herbicides
Cutleaf Eveningprimrose Control by Glyphosate. Tifton, 2000.
Cutleaf Eveningprimrose Control by 2,4-D. Tifton, 2000.
Cutleaf Eveningprimrose Fresh Weights After Treating with Burndown Herbicides. Tifton, 2000.
2,4-D Burndown for Cotton (from fallow land section of labels)
Current Recommendations -- 2,4-D Burndown for Cotton
Cotton Injury from 2.1 mls Per Acre of 2,4-D. Tifton, 2000.
Florida Pusley
Florida Pusley - Use a DNA Herbicide
Florida Pusley Control with Glyphosate and Glyphosate Tank Mixtures. Tifton, 2000.
Yellow and Purple Nutsedge
Yellow and Purple Nutsedge Control Programs
Yellow and Purple Nutsedge Control by Glyphosate. Greenhouse.
Yellow and Purple Nutsedge Control by MSMA. Greenhouse.
Morningglory
Mid-Season Morningglory Control by Glyphosate & Glyphosate/Staple Mixtures
Glyphosate/Staple Tank Mixtures
Smallflower Morningglory Control by Glyphosate Alone and Mixed with Residual Herbicides
Asiatic Dayflower
Asiatic Dayflower Control by Glyphosate & Glyphosate/Staple Mixtures. Grady Co., 2000.
Asiatic Dayflower Control by Glyphosate Mixtures at Layby. Grady Co., 2000.
Asiatic Dayflower Control by Conventional Layby Herbicides. Grady Co., 2000.
Hemp Sesbania
Hemp Sesbania Control by Glyphosate. Tifton, 2000.
Glphosate + Tank Mix Partner
Tank Mix Partners - Early Season
RR Cotton Injury from Glyphosate/Staple Mixtures
Tank Mix Partners - Early Season
Tank Mix Partners -Late Season
Tank Mix Partners
Tank Mix Partners
Tank Mix Partners
Texas Panicum Control by Glyphosate Alone and in Mixture with Residual Herbicides
Crowfootgrass Control by Glyphosate Alone and in Mixture with Residual Herbicides
Bristly Starbur Control by Glyphosate Alone and in Mixture with Residual Herbicides
Palmer Amaranth Control by Glyphosate Alone and in Mixture with Residual Herbicides
Glyphosate Comparision Picture
What's Wrong with my Cotton
SLIDE CONTENTS
PPT Slide RR Cotton Tolerance to Glyphosate and Managing Difficult to Control Weeds A. Stanley Culpepper
Glyphosate Overtop Prior to 5th Leaf 1. 2 applications 2. applications 10 days apart 3. 2 nodes of growth
Glyphosate Overtop After 4th Leaf?
PPT Slide Lint Cotton Yields in RR Cotton when Treated Topically with Glyphosate at Various Growth Stages 1) Ten plants per plot were hand harvested on October 10, 1999 in Moultrie, GA. 2) Roundup Ultra applied at 1 qt/A broadcast over-the-top. Conventional plots treated with standard herbicide system. a a a b b
PPT Slide Lint Yields (Nodes 5-14) in RR Cotton when Treated Topically with Glyphosate at Various Growth Stages 1) Ten plants per plot were hand harvested on October 10, 1999 in Moultrie, GA. 2) Roundup Ultra applied at 1 qt/A broadcast over-the-top. Conventional plots treated with standard herbicide system. a a a b b
PPT Slide Unopened Bolls in RR Cotton when Treated with Glyphosate Topically at Various Growth Stages 1) Ten plants per plot were hand harvested on October 10, 1999 in Moultrie, GA. 2) Roundup Ultra applied at 1 qt/A broadcast over-the-top. Conventional plots treated with standard herbicide system.
PPT Slide Glyphosate 9-leaf No Glyphosate
PPT Slide Glyphosate Overtop After 4th Leaf Stage Can cause boll shed, delay maturity Salvage treatment only
Is Stem Absorption of Glyphosate Directed in RR Cotton a Concern? No noted concerns in field trials Lab data from North Carolina, Georgia, and Mississippi?
PPT Slide Directing Glyphosate in RR Cotton? Precision PD or hooded sprayers
PPT Slide Directing Glyphosate in RR Cotton? Precision PD or hooded sprayers Direct spray to the base of the cotton plants
PPT Slide
PPT Slide Directing Glyphosate in RR Cotton? Precision PD or hooded sprayers Direct spray to the base of the cotton plants Contact of spray with cotton leaves should be avoided to the maximum extent possible
PPT Slide
PPT Slide
PPT Slide
PPT Slide
PPT Slide
PPT Slide Directing Glyphosate in RR Cotton? Precision PD or hooded sprayers Direct spray to the base of the cotton plants Contact of spray with cotton leaves should be avoided to the maximum extent possible Place nozzles in low position directing a horizontal spray pattern under the cotton leaves to contact weeds in the row
PPT Slide
PPT Slide
PPT Slide
Cotton Yield After Various Glyphosate Applications. Moultrie, 2000.* *Glyphosate applied at 1.0 lb ai/A. PD = precision directed at cotyledons; SD = sloppy directed 33 to 40% up the plant. Standard system = Prowl + Cotoran fb Staple fb Caparol + MSMA. LSD = 55 Lint yield (Lb/A) Standard system Topical 1- & 4-lf Topical 4-lf PD 8- & 12-lf Topical 4-lf SD 8- & 12-lf a a a b b Topical 1-, 4-, & 12-lf
Number of Bolls on Nodes 5-10 After Various Glyphosate Applications. Moultrie, 2000.* *Glyphosate applied at 1.0 lb ai/A. PD = precision directed at cotyledons; SD = sloppy directed 33 to 40% up the plant. Standard system = Prowl + Cotoran fb Staple fb Caparol + MSMA. LSD = 52 Standardsystem Topical 1- & 4-lf Topical 4-lf PD 8- & 12-lf Topical 4-lf SD 8- & 12-lf a a a b # of bolls/ 6 feet
Boll Weights from Nodes 5-10 After Various Glyphosate Applications. Moultrie, 2000.* *Glyphosate applied at 1.0 lb ai/A. PD = precision directed at cotyledons; SD = sloppy directed 33 to 40% up the plant. Standard system = Prowl + Cotoran fb Staple fb Caparol + MSMA. LSD = 52 Grams/6 feet Standardsystem Topical 1- & 4-lf Topical 4-lf PD 8- & 12-lf Topical 4-lf SD 8- & 12-lf a a a b
Number of Bolls on Nodes ᡂ After Various Glyphosate Applications. Moultrie, 2000.* *Glyphosate applied at 1.0 lb ai/A. PD = precision directed at cotyledons; SD = sloppy directed 33 to 40% up the plant. Standard system = Prowl + Cotoran fb Staple fb Caparol + MSMA. LSD = NS Standardsystem Topical 1- & 4-lf Topical 4-lf PD 8- & 12-lf Topical 4-lf SD 8- & 12-lf a a a a # of bolls/6 feet
Boll Weights from Nodes ᡂ After Various Glyphosate Applications. Moultrie, 2000.* *Glyphosate applied at 1.0 lb ai/A. PD = precision directed at cotyledons; SD = sloppy directed 33 to 40% up the plant. Standard system = Prowl + Cotoran fb Staple fb Caparol + MSMA. LSD = NS Grams/6 feet Standardsystem Topical 1- & 4-lf Topical 4-lf PD 8- & 12-lf Topical 4-lf SD 8- & 12-lf a a a a
Number of Vegetative Bolls After Various Glyphosate Applications. Moultrie, 2000.* *Glyphosate applied at 1.0 lb ai/A. PD = precision directed at cotyledons; SD = sloppy directed 33 to 40% up the plant. Standard system = Prowl + Cotoran fb Staple fb Caparol + MSMA. LSD = 4 # of bolls/6 feet Standardsystem Topical 1- & 4-lf Topical 4-lf PD 8- & 12-lf Topical 4-lf SD 8- & 12-lf a a a b
Vegetative Boll Weights After Various Glyphosate Applications. Moultrie, 2000.* *Glyphosate applied at 1.0 lb ai/A. PD = precision directed at cotyledons; SD = sloppy directed 33 to 40% up the plant. Standard system = Prowl + Cotoran fb Staple fb Caparol + MSMA. LSD = 18 Grams/6 feet Standardsystem Topical 1- & 4-lf Topical 4-lf PD 8- & 12-lf Topical 4-lf SD 8- & 12-lf a a a b
PPT Slide Precision and Sloppy Applied Glyphosate
PPT Slide Precision and Sloppy Applied Glyphosate
PPT Slide Directing After 4-leaf Stage? Glyphosate preferred for grasses or perennials Otherwise, conventional chemistry preferred
PPT Slide Directing After 4-leaf Stage? Glyphosate preferred for grasses or perennials Otherwise, conventional chemistry preferred 1. Better morningglory control 2. Residual weed control 3. Resistant management strategy 4. Avoid weed shifts 5. Reduce risk of boll shed
PPT Slide Weeds Difficult to Control by Glyphosate?
PPT Slide Cutleaf Eveningprimrose Response to Burndown Herbicides Treatment Rating Gramoxone F Gramoxone + Direx G Glyphosate F Glyphosate + Direx G Glyphosate + Harmony Extra F-G Glyphosate + Clarity G Glyphosate + 2,4-D E
Cutleaf Eveningprimrose Control by Glyphosate. Tifton, 2000.* % control *Roundup Ultra applied at 1 qt/A.
Cutleaf Eveningprimrose Control by 2,4-D. Tifton, 2000.* % control *2,4-D applied at 1 qt/A.
Cutleaf Eveningprimrose Fresh Weights After Treating with Burndown Herbicides. Tifton, 2000.* Grams/plot *Fresh weights taken from 12 plants per plot. Roundup Ultra applied at 2 pt/A and 2,4-D at 1 pt/A.
2,4-D Burndown for Cotton(from fallow land section of labels) No specific language concerning cotton Do not plant any crop in treated fallow land until 3 months after treatment or until chemical has disappeared from soil
Current Recommendations -- 2,4-D Burndown for Cotton 1 pt/acre Alone or Mixed with Glyphosate Applied 45 days before planting Research to date shows effectiveness and crop safety
Cotton Injury from 2.1 mls Per Acre of 2,4-D. Tifton, 2000.
PPT Slide Weeds Difficult to Control by Glyphosate?
PPT Slide USE A DNA HERBICIDE
Florida Pusley Control with Glyphosate and Glyphosate Tank Mixtures. Tifton, 2000.* % control 87 bc 92 ab 99 a 81 bc *Florida pusley 2 inches. Roundup UltraMAX applied at 1.25 pt; 2,4-D at 1 pt; Direx or Caparol at 1.5 pt.
PPT Slide Weeds Difficult to Control by Glyphosate?
PPT Slide Controlling Yellow and Purple Nutsedge? Nutsedge Control Programs: 1) 2 applications of glyphosate prior to 5th leaf followed by conventional chemistry including 2 lb ai MSMA directed 2) 1 application of glyphosate prior to 5th leaf followed by conventional chemistry including 2 lb ai MSMA directed 3) 2 applications of glyphosate 4) Zorial or Staple?????
Yellow and Purple Nutsedge Control by Glyphosate. Greenhouse. Glyphosate (lb) *Purple nutsedge controlled significantly greater than yellow nutsedge. 42 42 81 77 90 82 % control * * 70 98 * LSD=10
Yellow and Purple Nutsedge Control by MSMA. Greenhouse. MSMA (lb) *Yellow nutsedge controlled significantly greater than purple nutsedge. 48 42 61 49 82 69 % control * * LSD=10
PPT Slide Weeds Difficult to Control by Glyphosate?
PPT Slide Mid-Season Morningglory Control by Glyphosate & Glyphosate/Staple Mixtures. Moultrie, 2000. Things to consider? 1. Morningglory size at time of application (5 inches here). 2. Will you post-direct with conventional chemistry or glyphosate? Glyphosate 73 89 Glyphosate + Staple 93 97 Pitted Smallflower morningglory morningglory
PPT Slide Glyphosate/Staple Tank Mixtures DuPont label allows tank mix of 1.5 pt of Roundup Ultra plus 0.6 oz of Staple per acre broadcast Dupont’s Staple Plus
PPT Slide Smallflower Morningglory Control by Glyphosate Alone and Mixed with Residual Herbicides; Attapulgus, 2000. % control Smallflower mg 4 to 5 inches; irrigated environment Roundup (2 pt/A), Bladex (1.5 pt/A), Caparol (1.5 pt/A), Direx (1.5 pt/A), Valor (2 oz/A) a b a a a
PPT Slide Weeds Difficult to Control by Glyphosate?
Asiatic Dayflower Control by Glyphosate & Glyphosate/Staple Mixtures. Grady Co., 2000.* % control *Dayflower 1 to 5 inches. Ratings 30 days after treatment. Roundup Ultra applied at 1.5 pt/A and Staple at 0.6 oz/A. 67 90 Glyphosate Glyphosate + Staple
Asiatic Dayflower Control by Glyphosate Mixtures at Layby. Grady Co., 2000.* % control LSD = 10 *Dayflower 1 to 5 inches. Ratings taken 30 days after directing in 8 to 10 inch cotton. Roundup Ultra, Caparol, and Direx applied at 1.5 pt/A. Cobra, Harvade, and Valor applied at 8 oz/A, 8 oz/A, and 2 oz/A, respectively. 67 80 86 81 76 85
Asiatic Dayflower Control by Conventional Layby Herbicides. Grady Co., 2000.* % control 80 90 84 82 78 78 90 LSD = 9 91 85 *Dayflower 1 to 5 inches. Ratings taken 30 days after directing in 8 to 10 inch cotton. Bladex, Caparol, Cotoran, and Direx applied at 2 pt/A. Cobra, Harvade, Linex, MSMA, and Valor applied at 9.6 oz/A, 9 oz/A, 1.5 pt/A, 2.67 pt/A, and 2 oz/A, respectively.
PPT Slide Weeds Difficult to Control by Glyphosate?
Hemp Sesbania Control by Glyphosate. Tifton, 2000.* % control *Roundup Ultra applied at 2 pt/A. Experiment conducted under center irrigation. 3 inches 7 inches 86 59
PPT Slide Glyphosate + Tank Mix Partner 1. Increase morningglory control 2. Increase dayflower control 3. Residual weed control
PPT Slide Tank Mix Partners-Early Season 1. Staple
PPT Slide RR Cotton Injury from Glyphosate/Staple Mixtures
PPT Slide Tank Mix Partners-Early Season 1. Staple 2. Dual Magnum 3. MSMA
PPT Slide Tank Mix Partners-Late Season 1. Diuron* 5. Harvade* 2. Caparol 6. MSMA 3. Cyanazine* 7. Dual Magnum 4. Cobra 8. Prowl* *Label supports tank mix with Roundup
PPT Slide Tank Mix Partners Tank mixes 1. crop tolerance 2. POST control 3. residual weed control 4. carryover
PPT Slide Tank Mix Partners Consider... weed species and sizes, economics, cotton stage, environment??
PPT Slide Tank Mix Partners Consider... weed species and sizes, economics, cotton stage, environment?? DON’T FORGET ABOUT ANTAGONISM
PPT Slide Texas Panicum Control by Glyphosate Alone and in Mixture with Residual Herbicides. Ponder Farm, 1999. % control Texas panicum 6 to 9 inches; fair to dry environment Roundup (2 pt/A), Bladex (1.5 pt/A), Caparol (1.5 pt/A), Direx (1.5 pt/A), Valor (2 oz/A) a b ab a b
PPT Slide Crowfootgrass Control by Glyphosate Alone and in Mixture with Residual Herbicides. Ponder Farm, 1999. % control Crowfootgrass 3 to 6 inches; fair to dry environment Roundup (2 pt/A), Bladex (1.5 pt/A), Caparol (1.5 pt/A), Direx (1.5 pt/A), Valor (2 oz/A) a b b ab b
PPT Slide Bristly Starbur Control by Glyphosate Alone and Mixed with Residual Herbicides. Attapulgus, 2000. % control Starbur 4 to 7 inches; irrigated environment Roundup (2 pt/A), Bladex (1.5 pt/A), Caparol (1.5 pt/A), Direx (1.5 pt/A), Valor (2 oz/A) a a b b b
PPT Slide Palmer Amaranth Control by Glyphosate Alone and Mixed with Residual Herbicides. Attapulgus, 2000. % control Palmer amaranth 4 to 7 inches; irrigated environment Roundup (2 pt/A), Bladex (1.5 pt/A), Caparol (1.5 pt/A), Direx (1.5 pt/A), Valor (2 oz/A) ab a b b ab
PPT Slide Roundup Ultra (1 qt/A) + Caparol (1.5 pt/A)
PPT Slide What’s Wrong With My Cotton? It’s got to be bronze wilt or GLYPHOSATE!!!!!!!!!!