Table 2.2-5. Characteristics of "burndown" and postemergence corn herbicides

**Table 2.2-5. Characteristics of “burndown” and postemergence corn herbicides.**
Herbicide¹	Family	Mode of action	Site of action	Systemic²	Injury symptoms	Weeds controlled	Residual³	Potential problems
See for additional products containing these active ingrediants. Movement of herbicide from foilage to roots. Important for perennial weed activity. Residual: N = no soil activity; S = one or two weeks soil activity; M = one or two months; L = full season, may carry over under certain conditions or if misapplied. Residual activity is dependent upon rate, soil type, and environmental conditions.
2,4-D	Phenoxy	Growth regulator	Multiple	Yes	Twisting of foliage, strapped leaves, brittle corn stalks, malformed b	Annual broadleaves and perennials	S	Perennials too small, corn too large, resulting in injury
Accent (nicosulfuron)	Sulfonylurea	Amino acid biosynthesis inhibitor (protein)	ALS synthase	Yes	Quickly stops weed growth, gradually turn yellow and die	Foxtails, shattercane, seedling and rhizome johnsongrass	S-M	Incorrect adjuvant, drought-stressed weeds, tolerant weeds
Aim (carfentrazone)	Triazoline	Cell membrane disrupter (contact)	PPO	No	Foliar burning	Annual broadleaves	N	Use without a surfactant, poor spray coverage
atrazine	Triazine	Photosynthesis inhibitor	D-1 quinone protein	No	Foliar burning	Annual broadleaves	M-L	Weeds too large; resistant species
Banvel / Clarity (dicamba)	Benzoic acid	Growth regulator	Multiple	Yes	Twisting of foliage, leaf cupping	Annual and perennial broadleaves	S-M	Perennials too small, drift onto nontarget plants
Basagran (bentazon)	Benzothia-diazole	Photosynthesis inhibitor	D-1 quinone protein	No	Foliar burning	Annual broadleaves, yellow nutsedge	N	Weeds too large; tolerant species; droughty weather
Basis / Resolve Q (rimsulfuron + thifensulfuron)	Sulfonylurea	Amino acid biosynthesis inhibitor (protein)	ALS synthase	Yes	Quickly stops weed growth, gradually turn yellow and die	Small annual grasses and broadleaves	S-M	Incorrect adjuvant, drought-stressed weeds plus tolerant weeds; tankmi
Beacon (primisulfuron)	Sulfonylurea	Amino acid biosynthesis inhibitor (protein)	ALS synthase	Yes	Quickly stops weed growth, gradually turn yellow and die	Annual broadleaves, shattercane, seedling and rhizome johnsongrass	S-M	Incorrect adjuvant, drought-stressed weeds, tolerant weeds
Buctril (bromozynil)	Nitrile	Photosynthesis inhibitor	D-1 quinone protein	No	Foliar burning	Annual broadleaves	N	Weeds too large; tolerant species, droughty weather
Cadet (fluthiacet)	Triazinone (imide)	Cell membrane disruptor (contact)	PPO	No	Foliar burning	Annual broadleaves	N	Poor spray coverage, use without a surfactant
Callisto (mesotrione)	Callistemone	Pigment inhibitor	HPPD enzyme	Yes	Chlorotic, whitened plant tissue	Annual broadleaves and large crabgrass	M	Incorrect adjuvants; drought-stressed weeds; interactions with certain
Distinct (dicamba + diflufenzopyr)	Benzoic acid + semi-carbazone	Growth regulator	Multiple	Yes	Twisting, bending, cupping of foilage	Annual and perennial broadleaves	S-M	Perennials too small, annuals too large, drift onto nontarget plants,
Exceed (prosulfuron + primisulfuron)	Sulfonylurea	Amino acid biosynthesis inhibitor	ALS synthase	Yes	Quickly stops weed growth, gradually turn yellow and die	Annual broadleaves	S-M	Incorrect adjuvant, drought-stressed weeds
Glyphosate	Amino acid derivative	Amion acid biosynthesis inhibitor (protein)	EPSP synthase	Yes	Quickly stops weed growth, gradually turn yellow and die	Annual and perennial grasses and broadleaves	N	Perennial weed too young, poor spray pattern, high spray volume, or ap
Gramoxone (paraquat)	Bipyridilium)	Cell membrane disrupter (contact)	Photosystem I	No	Foliar burning	Annual broadleaves and grasses	N	Use without a surfactant, poor coverage
Harmony SG (thifensulfuron)	Sulfonylurea	Amino acid biosynthesis inhibitor (protein)	ALS synthase	Yes	Quickly stops weed growth, gradually turn yellow and die	Annual broadleaves	S-M	Incorrect adjuvant, drought-stressed weeds, resistant species
Impact (topramezone)	Triketone	Pigment inhibitor	HPPD enzyme	Yes	Chlorotic, whitened plant tissue	Annual broadleaves and some grasses	M	Incorrect adjuvant, drought-stressed weeds, weeds too large
Laudis (tembotrione)	Pyrazolone	Pigment inhibitor	HPPD enzyme	Yes	Chlorotic, whitened plant tissue	Annual broadleaves and some grasses	M	Incorrect adjuvant, drought-stressed weeds, weeds too large
Liberty / Ignite (glufosinate)	Amino acid derivative	Amino acid biosynthesis inhibitor	GS enzyme	Somewhat	Foliar burning and yellowing	Annual broadleaves and some perennials	N	Poor coverage, large weeds, new weed flushes
Option (foramsulfuron)	Sulfonylurea	Amino acid biosynthesis inhibitor (protein)	ALS synthase	Yes	Quickly stops weed growth, gradually turn yellow and die	Annual broadleaves	S-M	Incorrect adjuvant, drought-stressed weeds, resistant species
Permit (halosulfuron)	Sulfonylurea	Amino acid biosynthesis inhibitor (protein)	ALS synthase	Yes	Quickly stops weed growth, gradually turn yellow and die	Annual broadleaves, yellow nutsedge	S-M	Incorrect adjuvant, drought-stressed weeds, tolerant weeds, tank-mix f
Resource (flumiclorac)	N-phenyl-phthalimide derivative	Cell membrane disrupter (contact)	PPO	No	Foliar burning	Annual broadleaves	N	Temporary crop injury, poor coverage, droughty weather, weeds too larg
Sencor (metribuzin)	Triazine	Photosynthesis inhibitor	D-1 quinone protein	No	Foliar burning	Annual broadleaves	M	Weeds too large; resistant species
Stinger (clopyralid)	Pyridine	Growth regulator	Multiple	Yes	Twisting of foliage, leaf cupping	Annual broadleaves, thistles	S-M	Perennials too small, corn too large, resulting in injury

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Table 2.2-5. Characteristics of "burndown" and postemergence corn herbicides

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