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Managing Large Morningglory in Roundup-Ready Cotton With Lay-By Herbicides
AUTHOR
S. G. Wilson, University of Georgia
A. S. Culpepper
, University of Georgia
A. C. York, N. C. State University
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TABLE OF CONTENTS
Managing Large Morningglory in Roundup-Ready Cotton with Lay-By Herbicides
Large Morningglory
Study Objective
Locations
Materials & Methods
Materials & Methods
Materials & Methods
Treatments
Morningglory Response to Lay-By Herbicides. 2001.
No Directed Application
Roundup UltraMax 1.6 pt
Roundup UltraMax 1.6 pt + Valor 1 oz
Valor 2 oz + MSMA 2 lb
Roundup UltraMax 1.6 pt + Harvade 6 oz
Morningglory Re-growth
Morningglory Response to Lay-By Herbicides. 2002.
Large Pitted Morningglory Response to Lay-By Herbicides. 2003.
Cotton Response to Lay-By Herbicides
Soil Uptake of Harvade
Herbicide Injury
Summary
Summary
Summary
Questions?
The End
SLIDE CONTENTS
S.G. Wilson, A.S. Culpepper, and A.C. York University of Georgia and N. C. State University MANAGING LARGE MORNINGGLORY IN ROUNDUP – READY COTTON WITH LAY-BY HERBICIDES
STUDY OBJECTIVE: To Evaluate Lay-By Herbicide Options For Controlling Large Pitted Morningglories And Evaluate Plant Injury
Locations Moultrie * Ocilla *
Materials & Methods RR Variety Sprayed at 4-Leaf Stage w/ Commercial Broadcast Sprayer Plots Sprayed At Lay-By w/ Backpack Sprayer @19psi & 14.8 GPA
Materials & Methods Randomized Complete Block Design Four Replications
Materials & Methods Treatments Evaluated At ~ Two And Four Weeks For Efficacy Treatments Evaluated At ~ One And Two Weeks For Injury
Treatments: RU + Aim RU + MSMA Caparol + MSMA Direx + MSMA Valor + MSMA RU RU + Direx RU + Harvade + COC RU + Staple RU + Valor *RU abbreviated for various brands of Monsanto’s glyphosate products at 1 lb ai/A, Staple 0.6 to 0.8/A oz, Direx 1.0-1.5 pt/A when mixed with RUand 2 pt/A when mixed with MSMA, Harvade 6-8 oz/A, Aim 0.8-1 oz/A, MSMA 2 lb ai/A Valor 1 oz/A when mixed with RU and 2 oz/A when mixed with MSMA, Caparol 2 pt/A, and COC 1 pt/A.
Morningglory Response to Lay-By Herbicides. 2001. * Values followed by the same letter within a column are not different at P=0.05
No Directed Application No Directed Application
Roundup UltraMax 1.6 pt No Directed Application
Roundup UltraMax 1.6 pt + Valor 1 oz No Directed Application
Valor 2 oz + MSMA 2 lb No Directed Application
Roundup UltraMax 1.6 pt + Harvade 6 oz No Directed Application
Morningglory Re-growth Treatments including Aim looked excellent initially, but MG’s suckered back out by 14 DAT (right)
Morningglory Response to Lay-By Herbicides. 2002. * Values followed by the same letter within a column are not different at P=0.05
Large Pitted Morningglory Response to Lay-By Herbicides. 2003. * Values followed by the same letter within a column are not different at P=0.05
Cotton Response to Lay-By Herbicides* * Values followed by the same letter within a column are not different at P=0.05
Non-treated Control Soil Uptake of Harvade
Herbicide Injury Cotton was extremely green (no woody material) at time of application At 5 DAT, injury ranged from 16-25% for Aim or Valor Mixtures
Summary On 3-4’Mg, RU + Valor or Valor + MSMA were the most effective treatments On 2’ MG, RU + Staple, Valor, or Aim as well as Valor + MSMA were the most effective treatments On 9” Mg, the most effective treatments were Direx, Harvade, Valor, Aim or MSMA when mixed with RU
Summary Tank mixes including Aim and Valor were more injurious Injury was worse on green cotton Harvade injury appeared as leaf chlorosis Injury was short-lived
Summary No differences in yield were noted Early season weed competition was similar across the trial
QUESTIONS?
THE END