Response of Conifers to Growth Retardants

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Abstract
Application of four growth retardants (B-995 [N-dimethylaminosuccinamic acid] AMO-1618 [4-hydroxy-5-isopropyl-2-methylphenyltrimethylammonium chloride, 1-piperidine], Phosfon-D, and CCC [2-chloroethyltrimethylammonium chloride]) to seedlings of Arizona cypress, coastal redwood, Douglas fir, and Coulter pine showed that growth of Arizona cypress and coastal redwood treated with B-995 or AMO-1618 was retarded, and this effect was partially reversed with a 10-ppm gibberellin spray; Arizona cypress was stunted by Phosfon-D but was not affected by CCC; results with Douglas fir were inconclusive because of bud dormancy on treated plants; growth of Coulter pine was retarded by B-995 or Phosfon-D but was unaffected by AMO-1618 or CCC.