Accent / nicosulfuron

WSSA Resistance Group: 2

Crop/non-crop registration: Field corn (not for use on some sweet or seed corn hybrids, check product label)

Sensitive weeds: Annual grass species: green and yellow foxtail, fall panicum, barnyardgrass, witchgrass, proso millet; quackgrass, johnsongrass.

Application method: POST- within 1-8 leaf stage of corn.

Absorption & Translocation: Following foliar absorption, nicosulfuron is rapidly absorbed through the leaves and translocated via both xylem and phloem.

Mode of Action: Inhibition of acetolactate synthase.

Metabolic pathway inhibited: Inhibits acetolactate synthase (ALS), also called acetohydroxyacid synthase (AHAS), a key enzyme in the biosynthesis of the branched-chain amino acids isoleucine, lecucine, and valine.

Basis of Selectivity: Metabolized by tolerant species to non-phytotoxic compounds.

Symptoms: Growth of treated plants is inhibited within a few hours after application;but injury symptoms appear more than 1-2 wks later. Meristematic areas gradually become chlorotic and necrotic, followed by a general foliar chlorosis and necrosis.

Residuality: None; short (<1month).

Toxicity: Oral LD50 = >5000 mg/kg - practically non-toxic (ACCENT = >5000 mg/kg- practically non-toxic).

Additional comments: Emerged grasses will be controlled but subsequent germinating grasses will not; a non-ionic surfactant must be added; do not apply to corn that has been treated with an organophosphorous soil insecticide (e.g. COUNTER).