Abstract
Abstract Ancymidol (α-cyclopropyl-α-(4-methoxyphenyl)-5-pyrimidinemethanol) in soil mix retarded growth of potted citrus plants. Three-month-old ‘Valencia’ orange trees (Citrus sinensis (L.) Osb.) on one-year-old sour orange rootstock (C aurantium L.) grew 92% less in height than control plants in 5 months under greenhouse conditions with 0.10% active ingredient (ai) (by weight) concentration of ancymidol in the soil mix. Concentrations of 0.4% ai resulted in marked growth reduction of 3-month-old ‘Duncan’ grapefruit seedlings (C. Paradisi Macfad.). Other tests showed that neither ancymidol nor the reduced growth following its use increased cold hardening of ‘Valencia’ trees.
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