ABSTRACT
An onium compound, chlorocholine chloride (CCC), 2-chloroethyltrimethylammonium chloride (24, 31, 51) is being used extensively in European countries under the trade name CYCOCEL to control lodging in wheat Triticum aestivum L.) (3, 5, 24, 46), oats (Avena sativa L.) (3, 46), rye (Secale cereale L.) (3, 46), and barley (Hordeum vulgare L.)(3). Since the development and use of CCC in 1960, several new biologically active onium compounds have been synthesized (33, 36, 48, 51, 58) which have activities similar to CCC: hydrazonium and morpholinium compounds and pyridazinium, piperidinium, phosphonium, and pyrrolidinium salts. In addition to CCC, another bioregulator from this class of compounds will be discussed below: 1,1-dimethylpiperidinium chloride (DPC), trade name pix(TM) (32, 34, 46, 47).
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