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United States Department of Agriculture

Agricultural Research Service

Title: Amicarbazone, A New Photosystem II Inhibitor

item Dayan, Franck
item Trindade, Maria L.b.
item Velini, Edivaldo

Submitted to: Weed Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/27/2009
Publication Date: 11/1/2009
Citation: Dayan, F.E., Trindade, M., Velini, E.D. 2009. Amicarbazone, A New Photosystem II Inhibitor. Weed Science. 57:579-583.

Interpretive Summary: Amicarbazone is a new herbicide that controls many grass and broadleaf weeds. The efficacy of this herbicide on corn and selected weeds was tested with either foliar and root application. Amicarbazone was shown to be a strong inhibitor of photosynthesis.

Technical Abstract: Amicarbazone is a new triazolinone herbicide with a broad spectrum of weed control. The phenotypic responses of sensitive plants exposed to amicarbazone include chlorosis, stunted growth, tissue necrosis and death. Its efficacy as both a foliar and root applied herbicide suggests that absorption and translocation of this compound is very rapid. This new herbicide is a potent inhibitor of photosynthetic electron transport, inducing chlorophyll fluorescence and interrupting oxygen evolution ostensibly via binding to the Qb domain of photosystem II in a manner similar to the triazines and the triazinones classes of herbicides. As a result, it is susceptible to the most common form of resistance to PSII inhibitors. Nonetheless, amicarbazone has a good selectivity profile and is a more potent herbicide than atrazine, which enables its use at lower rates than those of traditional photosynthetic inhibitors.

Last Modified: 06/23/2017
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