An Evaluation of Dormant Oil Phytotoxicity on Six Species of Woody Ornamentals    (View PDF)

R.W. Baxendale and W.T. Johnson

Abstract: Conflicting reports concerning possible phytotoxicity of horticultural oils applied to woody plants in dormant condition prompted an evaluation of superior oil Sunspray 6E on six species of ornamentals. Young dormant saplings of pear, sugar maple, Japanese maple, European hornbeam, Scots pine and red pine were unaffected by oil concentrations of up to 8%. Bud break was neither reduced nor significantly delayed and no damage to bark or bud scales was observed at any concentration. Leaves developed normally when dormancy was broken with no twig dieback observed. Results show no phytotoxicity for this product even when applied at rates 4X the usually recommended concentration.

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https://doi.org/10.48044/jauf.1988.025