| atrazine |
Triazine |
Photosynthesis inhibitor |
D-1 quinone protein |
Interveinal yellowing and necrosis of older leaves |
Annual broadleaves and certain grasses |
L |
Triazine-resistant weeds; pH below 6.0; tolerant species such as fall panicum; lack of rain to activate |
| Axiom (flufenacet + metribuzin) |
Oxyacetamide + triazine |
Seedling growth inhibitor + photosynthesis inhibitor |
Multiple + D-1 quinone protein |
Looping of grass leaves at emergence; interveinal yellowing and necrosis of older leaves |
Annual grasses and broadleaves |
M |
Lack of rain to activate emerged weeds at time of application; triazine-resistant weeds; crop injury due to adverse environment |
| Balance (isoxaflutole) |
Isoxazole |
Pigment inhibitor |
HPPD enzyme |
Chlorotic, whitened plant tissue |
Annual broadleaves, some grasses |
M |
Lack of rain to activate; poor seed burial and soil types; cool/wet conditions increase chance of crop injury |
| Callisto (mesotrione) |
Callistemone |
Pigment inhibitor |
HPPD enzyme |
Chlorotic, whitened plant tissue |
Annual broadleaves |
M |
Lack of rain to activate; interactions with certain OP insecticides will cause crop injury |
| Define (flufenacet) |
Oxyacetamide |
Seedling growth inhibitor |
Multiple |
Looping of grass leaves at emergence |
Annual grasses |
M |
Lack of rain to activate; emerged weeds at time of application; crop injury due to adverse weather conditions |
| Dual (metolachlor) |
Chloroacetamide |
Seedling growth inhibitor (shoot) |
Multiple |
Looping of grass leaves at emergence |
Annual grasses and certain broadleaves |
M |
Lack of rain to activate surface appliation; emerged weeds at time of application; tolerant species |
| Eradicane (EPTC) |
Thiocarbamate |
Seedling growth inhibitor (shoot) |
Multiple |
Looping and knotting of grass leaves at emergence |
Annual grasses, shattercane, seedling johnsongrass |
M |
Poor or delayed incorporation; cool, wet soils; Johnsongrass rhizomes not broken by tillage |
| Harness / Degree or Surpass / Topnotch (acetochlor) |
Chloroacetamide |
Seedling growth inhibitor (shoot) |
Multiple |
Looping of grass leaves at emergence |
Annual grasses and certain broadleaves |
M |
Lack of rain to activate surface applications; emerged weeds at time of application, tolerant species |
| Lorox (linuron) |
Urea |
Photosynthesis inhibitor |
D-1 quinone protein |
Interveinal yellowing and necrosis of older leaves |
Annual broadleaves and certain grasses |
M |
Lack of rainfall to activate; too much rainfall causes leaching; tolerant species |
| Micro-tech (alachlor) |
Chloroacetamide |
Seedling growth inhibitor (shoot) |
Multiple |
Looping of grass leaves at emergence |
Annual grasses and certain broadleaves |
M |
Lack of rain to activate surface application; emerged weeds at time of application; certain species |
| Outlook (dimethenamid) |
Chloroacetamide |
Seedling growth inhibitor (shoot) |
Multiple |
Looping of grass leaves at emergence |
Annual grasses and certain broadleaves |
M |
Lack of rain to activate surface application; emerged weeds at time of application; certain species |
| Princep (simazine) |
Triazine |
Photosynthesis inhibitor |
D-1 quinone protein |
Interveinal yellowing and necrosis of older leaves |
Annual grasses and certain broadleaves |
L |
Lack of rain to activate; triazine-resistant weeds; pH below 6.0 |
| Prowl (pendimethalin) |
Dinitroanline |
Seedling growth inhibitor (root) |
Protein Tubulin protein |
Stunted shoot growth; P deficiency symptoms; swollen roots |
Annual grasses and certain broadleaves |
M-L |
Poor seed burial resulting in crop injury; lack of rain to activate |
| Python (flumetsulam) |
Sulfonamide |
Amino acid biosynthesis inhibitor (protein) |
ALS synthesis |
Prevents true leaf emergence, stunted growth, chlorosis, or purpling |
Annual broadleaves |
M-L |
Lack of rainfall to activate; pH <5.9 with high organic matter, in-furrow insecticide application, high soil pH (>7.8), and/or sandy-gravelly soils leading to crop injury, tolerant species |
