Mesotrione - TurfFiles - North Carolina State University
Mesotrione - TurfFiles - North Carolina State University
Mesotrione - TurfFiles - North Carolina State University
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Introduction<strong>Mesotrione</strong>Inhibits a precursor to plastoquinoneResults in decreased carotenoid productionVisual symptoms including bleaching followed by plantnecrosis
IntroductionReported to have activity onLarge crabgrass (Digitaria sanguinalis)Smooth crabgrass (Digitaria ischaemum)Henbit (Lamium amplexicaule)Broadleaf plantain (Plantego major)Yellow woodsorrel (Oxalis stricta)Nimblewill (Muhlenbergia schreberi)Has applications in cool- and warm-season turfgrass
IntroductionResearch trials were initiated to determine:Annual grass controlSmooth crabgrass (Digitaria ischaemum)Goosegrass (Eleusine indica)Turfgrass toleranceEstablished tall fescue (Festuca arundinacea)At spring or fall seeding
% Control10080Smooth Crabgrass ControlLate September84ab71b86ab<strong>Mesotrione</strong> 0.31<strong>Mesotrione</strong> 0.6260Barricade 0.754035c2000dPRE 4-3 POST 7-30Rates are lb ai per acre. PRE trts were applied 4-3 while POST trts were applied 7-30 andincluded NIS. When POST trts were applied, crabgrass averaged 2 tillers.
% ControlPostemergent Smooth Crabgrass Control1008073bc90a83ab<strong>Mesotrione</strong> 0.336060d<strong>Mesotrione</strong> 0.540200Late AugustLate SeptemberRates are lb ai per acre. Trts were applied 7-30 and included NIS. Crabgrass averaged 2 tillers.
% ControlSmooth Crabgrass Controlwith Pre- and Postemergent Applications1008078a94a94a76ab86ab89ab<strong>Mesotrione</strong> .31 fb .31<strong>Mesotrione</strong> .31 fb .6260<strong>Mesotrione</strong> .62 fb .6240200Late AugustLate SeptemberRates are lb ai per acre. PRE trts were applied 4-3 while POST trts were applied 7-30 andincluded NIS. When POST trts were applied, crabgrass averaged 2 tillers.
<strong>Mesotrione</strong> 0.25 lb ai applied May 1 (1-3 lf crabgrass),photo taken June 14
<strong>Mesotrione</strong> 0.375 lb ai applied May 1 (1-3 lf crabgrass),photo taken June 14
<strong>Mesotrione</strong> 0.5 lb ai applied May 1 (1-3 lf crabgrass),photo taken June 14
<strong>Mesotrione</strong> 0.25 lb ai applied June 6 (5-7 lf crabgrass),photo taken June 14
<strong>Mesotrione</strong> 0.375 lb ai applied June 6 (5-7 lf crabgrass),photo taken June 14
<strong>Mesotrione</strong> 0.5 lb ai applied June 6 (5-7 lf crabgrass),photo taken June 14
Summary Applied preemergent, mesotrione (0.31 or 0.62 lb ai/a) did not offer smoothcrabgrass control as control was
SummaryWith pre- and postemergent combinations,mesotrione .31 fb .31 provided 78 and 76%crabgrass control, respectively, late Augustand late September. .31 fb .62 provided 94 and86% control, while .62 fb .62 provided 94 and89% control respectively, late August and lateSeptember.
% ControlGoosegrass ControlLate September100<strong>Mesotrione</strong> 0.318069a-d76a-d<strong>Mesotrione</strong> 0.626056b-e<strong>Mesotrione</strong> .31 fb .314044def<strong>Mesotrione</strong> .31 fb .622025efg<strong>Mesotrione</strong> .62 fb .620Rates are lb ai per acre. Initial trts were PRE and were applied 3-26 while sequential trts were POST andwere applied 7-23 and included NIS. When POST trts were applied, goosegrass averaged 3 tillers.
% ControlPostemergent Goosegrass Control1008096a91a78a-d80abc<strong>Mesotrione</strong> 0.3360<strong>Mesotrione</strong> 0.540200Late AugustLate SeptemberRates are lb ai per acre. Trts were applied 7-23 and included NIS. Goosegrass averaged 3 tillers.
SummarySingle preemergent applications of mesotrioneoffered
SummarySingle postemergent applications ofmesotrione (0.33 or 0.5 lb ai) provided 96 and91% goosegrass control late August,respectively while control was reduced to 78and 80% by late September.
% Control100Postemergent Goosegrass ControlMid-September80604058bc69abc<strong>Mesotrione</strong> 0.19<strong>Mesotrione</strong> 0.2520025d3de4de0e2 Leaf 5 Leaf 2 TillerRates are lb ai per acre. 2 leaf trts were applied 6-8, 5 leaf trts were applied6-22, and 2 tiller trts were applied 7-6. All trts included NIS.
Summary<strong>Mesotrione</strong> (0.19 or 0.25 lb ai/a) applied earlypostemergent (2 leaf goosegrass) provided 58and 69% control mid-September, respectively.<strong>Mesotrione</strong> was not effective in controllingmature goosegrass (5 leaf & 2 tillerapplications)
Tolerance TrialsResearch trials were initiated to determine theeffect of mesotrione applications:At spring and fall seeding of tall fescue0.15 – 0.5 lb ai/a mesotrioneapplied at seeding and six weeks after seedingEstablished tall fescue0.125 – 0.5 lb ai/a mesotrioneapplied initially and six weeks after initial treatment
Tolerance Trials<strong>Mesotrione</strong> applied at spring or fall seeding orto established tall fescue, reductions in tallfescue establishment, phytotoxicity, or turfquality reductions were not objectionable atany time throughout the trial.
ConclusionsSingle preemergent applications of mesotrione did notprovide season long smooth crabgrass or goosegrasscontrol, although postemergent applications (0.31 lbai/a) provided fair to good smooth crabgrass orgoosegrass control.Additionally, with pre- and postemergentcombinations, mesotrione provided fair to goodsmooth crabgrass or goosegrass control.
Conclusions<strong>Mesotrione</strong> was not effective in controllingmature goosegrass.Tall fescue exhibited tolerance to mesotrioneapplied at spring or fall seeding or afterestablishment
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