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

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.

Polish Botanical Society

Szczepan Marczyński

Acta Agrobotanica

2015

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

Description:

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

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