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Potential for carryover of flurprimidol in mulch derived from landscape plants and trees treated with this tree growth regulator and its effects on plants were investigated. Flurprimidol (Cutless®) was applied as a soil drench to the growing medium of greenhouse grown zinnia (Zinnia elegans Jacq. ‘Scarlet’) at six concentrations ranging from 0.0016 to 5 mg/kg (0.3 to 0.0001 oz/lb) and as solid tree implants (0.2 g a.i./cm diameter) (0.018 oz/in) to plantation grown silver maple (Acer saccharinum L.) and white ash (Fraxinus americana L). Shoots of zinnia were collected three weeks after treatment with flurprimidol and the leaves and one-year-old twigs of the two tree species were collected 1, 6, and 18 months after treatment. Tissues were ground into small particles and either mixed with the growing medium or applied to the surface of pots containing zinnia. Low concentrations of flurprimidol (0.0016 to 0.04 mg/kg soil) (0.3 to 0.6 oz/lb) stimulated the growth of zinnia, whereas higher concentrations (0.2 to 5 mg/kg) (0.3 to 0.0001 oz/lb) reduced growth when applied either directly to the growing medium or as residue in mulch derived from treated plants. Mulch made from leaf or twig tissues of silver maple 6 and 18 months after treatment with trunk implants and of white ash 18 months after treatment reduced growth of zinnia.

Effects of Mulch Made From Flurprimidol Treated Zinnia, Silver Maple, and White Ash on Growth of Zinnia