The chemical defoliation of ornamental nursery shrubs Forsythia X intermedia Zab., Rosa cv. Lampion, Spiraea x bumalda Burv. cv. Froebelii, Spiraea X vanhouttei Zab.

Szczepan Marczyński

Abstract


The defoliants used on shrubs in the nursery were: ethephon, KJ, Mg(ClO3)2•6H2O, CuSO4•5H2O, (NH4)2SO4 in various concentrations separately or as mixtures. Spraying was performed on September 26-28 1972 and 1973. The most effective defoliant for Rosa cv. Lampion, Spiraea X bumalda cv. Froebelii, Spiraea X vanhouttei shrubs was KJ applied at a concentration of 0.2% or used in mixture with ethephon or (NH4)2SO4 in lesser concentrations. Effective defoliation of many shrubs including Forsythia X intermedia was obtained with Mg(ClO3)2 used at a concentration of 0.24-0.48% or CuSO4 at concentration of 2%. But at the same time these defoliants brought about comparatively the greatest retardation in shrubs development and growth and, in the case of Forsythia X intermedia, reducted also frost resistance.

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DOI: https://doi.org/10.5586/aa.1977.009

Journal ISSN:
  • 2300-357X (online)
  • 0065-0951 (print; ceased since 2016)
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Polish Botanical Society