Phenoxy and pyridinoxy Auxin-type herbicides · Phenoxy and pyridinoxy Auxin-type herbicides!...

Patrick A

. Clay

University of A

rizona

Phenoxy and pyridinoxyAuxin-type herbicides

!! PostemergencePostemergence

!! Foliar absorbed and Foliar absorbed and translocatedtranslocated

!! Also root absorbedAlso root absorbed

!! Broadleaf weedsBroadleaf weeds

Patrick A

. Clay

University of A

rizona


Stem twisting

Stem swelling

Clarity (dicamba)

Patrick A

. Clay

University of A

rizona


Clarity (dicamba)

Stem twisting

Stem and leaf reddening

Patrick A

. Clay

University of A

rizona


Clarity (dicamba)

Leaf curling and cupping

Patrick A

. Clay

University of A

rizona


Butyrac (2,4-DB)

Stem twisting

Necrosis

Patrick A

. Clay

University of A

rizona


Butyrac (2,4-DB)

Legumes not as injured as other broadleaves

Patrick A

. Clay

University of A

rizona


Butyrac (2,4-DB)

Leaf strapping

Patrick A

. Clay

University of A

rizona

Dinitroaniline herbicidesDNA’s

!! SoilSoil--appliedapplied

!! Root and shoot absorbedRoot and shoot absorbed

!! Not Not translocatedtranslocated

!! Grass weeds and some smallGrass weeds and some small--seeded seeded broadleaf weedsbroadleaf weeds

Patrick A

. Clay

University of A

rizona

Dinitroaniline herbicidesDNA’s

Prowl (pendimethalin)

Control of grasses and small seeded broadleaf weeds

Patrick A

. Clay

University of A

rizona

Chloroacetamide herbicides



!! TranslocatedTranslocated but not herbicidalbut not herbicidal

!! Grass weeds and some smallGrass weeds and some small--seeded seeded broadleaf weedsbroadleaf weeds

Patrick A

. Clay

University of A

rizona


Dual Magnum (s-metalachlor)

Buggy whipping

Patrick A

. Clay

University of A

rizona


Dual Magnum (s-metalachlor)

Cotton and Cantaloupe injury and morningglory control at 2x use rate

Patrick A

. Clay

University of A

rizona

Other “amides” and miscellaneous category herbicides!! pronamidepronamide ((KerbKerb))

!! napropamidenapropamide ((DevrinolDevrinol))

!! flufenacetflufenacet (Axiom(Axiom--w/metribuzinw/metribuzin))

!! isoxabenisoxaben (Gallery)(Gallery)

!! bensulidebensulide ((PrefarPrefar))

!! DCPA (DCPA (DacthalDacthal))

!! dichlobenildichlobenil ((CasoranCasoran))

!! quincloracquinclorac (Facet)(Facet)

Patrick A

. Clay

University of A

rizona

Miscellaneous chemistry herbicides

!! Foliar appliedFoliar applied

!! Shoot absorbedShoot absorbed

!! Not readily Not readily translocatedtranslocated


Patrick A

. Clay

University of A

rizona

Nitrile herbicides

BuctrilBuctril ((bromoxynilbromoxynil))

Chlorotic mosaic

Patrick A

. Clay

University of A

rizona


Roundup (glyphosate)

Chlorosis followed by necrosis

Patrick A

. Clay

University of A

rizona



Immediate cessation of growth

Stacked nodes (regrowth)

Patrick A

. Clay

University of A

rizona



Interveinalchlorosis at sub-lethal dose

Patrick A

. Clay

University of A

rizona



Patrick A

. Clay

University of A

rizona

Pigment inhibiting herbicides


!! Root absorbedRoot absorbed

!! TranslocatedTranslocated

!! BroadBroad--spectrum weedsspectrum weeds

Patrick A

. Clay

University of A

rizona


Evital (norflurazon) Bleached leaves

Patrick A

. Clay

University of A

rizona


Evital (norflurazon)

Patrick A

. Clay

University of A

rizona

Triazine herbicides

!! Soil and foliar appliedSoil and foliar applied

!! Root absorbed and Root absorbed and translocatedtranslocated

!! Not Not translocatedtranslocated out of treated leavesout of treated leaves


Patrick A

. Clay

University of A

rizona

Triazine herbicides

Aatrex (atrazine)

Interveinal chlorosis

Necrosis

New growth unaffected (foliar application)

Patrick A

. Clay

University of A

rizona

Triazine herbicides

Caporal (prometryn)

Patrick A

. Clay

University of A

rizona

Triazine herbicides

Caporal (prometryn)

Plants emerge then symptoms occur (chlorosisfollowed by necrosis)

Patrick A

. Clay

University of A

rizona

Phenylurea herbicides

!! Soil and foliar appliedSoil and foliar applied

!! Root absorbed and Root absorbed and translocatedtranslocated

!! Not Not translocatedtranslocated out of treated leavesout of treated leaves


Patrick A

. Clay

University of A

rizona


Karmex (diuron)Interveinalchlorosis on lower leaves

Patrick A

. Clay

University of A

rizona


Karmex (diuron)

Leaf tip burn

Patrick A

. Clay

University of A

rizona

Bipyridilium herbicides


!! Rapid Rapid burndownburndown activityactivity

!! NonNon--selective grass and broadleaf weedsselective grass and broadleaf weeds

Patrick A

. Clay

University of A

rizona


Gramoxone Max (paraquat)

Rapid desiccation of leaf tissue

Patrick A

. Clay

University of A

rizona



Leaf tip burn

Necrotic lesions

Patrick A

. Clay

University of A

rizona



Necrotic spots with red halo

Patrick A

. Clay

University of A

rizona

Diphenylether herbicides

Goal (oxyfluorfen)Bronzing of contacted leaf tissue

Patrick A

. Clay

University of A

rizona

Diphenylether herbicides

Goal (oxyfluorfen)

Bronzing of contacted leaf tissue

Patrick A

. Clay

University of A

rizona

Triazolinone herbicides

!! Foliar and soil appliedFoliar and soil applied

!! Readily absorbed by leavesReadily absorbed by leaves

!! Not Not translocatedtranslocated

!! Annual broadleaf weedsAnnual broadleaf weeds

Patrick A

. Clay

University of A

rizona


Aim (carfentrazone)Bronzing and necrosis of leaf tissue

Patrick A

. Clay

University of A

rizona


Aim (carfentrazone)

Bronzing and necrosis of leaf tissue

Patrick A

. Clay

University of A

rizona

Imidazolinone herbicides



!! Rapidly Rapidly translocatedtranslocated to growing pointsto growing points

!! Selective and Selective and broadspectrumbroadspectrum

Patrick A

. Clay

University of A

rizona


Pursuit (imazethapyr)

Buggy whipping

Patrick A

. Clay

University of A

rizona



Stunting (flat top)

Purple discoloration

Patrick A

. Clay

University of A

rizona



Lime green color

Cupping of upper leaves

Patrick A

. Clay

University of A

rizona



Stacked nodes

Patrick A

. Clay

University of A

rizona

Sulfonylurea herbicides




!! Selective and Selective and broadspectrumbroadspectrum

Patrick A

. Clay

University of A

rizona


Sandea (halosulfuron)

Red veins

Patrick A

. Clay

University of A

rizona


Sandea (halosulfuron)

Patrick A

. Clay

University of A

rizona

Pyrimidinyl oxybenzoate herbicide




!! Selective and broadleaf weeds Selective and broadleaf weeds

Patrick A

. Clay

University of A

rizona

Pyrimidinyl oxybenzoate herbicide

Staple (pyrithiobac)Red veins

Patrick A

. Clay

University of A

rizona

Aryloxyphenoxy propionate and Cyclohexanedione herbicides

grass herbicides


!! Shoot absorbedShoot absorbed

!! Rapid uptake and translocation to growing Rapid uptake and translocation to growing pointspoints

!! Selective and only grass weedsSelective and only grass weeds

Patrick A

. Clay

University of A

rizona


grass herbicidesSelect (clethodim)

Growing point easy to remove

Patrick A

. Clay

University of A

rizona


grass herbicidesSelect (clethodim)

Purpling of leaf tissue

Phenoxy and pyridinoxy Auxin-type herbicides · Phenoxy and pyridinoxy Auxin-type herbicides!...

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Transcript of Phenoxy and pyridinoxy Auxin-type herbicides · Phenoxy and pyridinoxy Auxin-type herbicides!...