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 (PSII) in a manner similar to
the triazines and the triazinones classes of herbicides. As a result, its efficacy 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.