Journal of Plant Diseases and Protection (2023) 130, 579-586

Florian Wulf, Jana Podhorna, Malgorzata Rybak, Carmen Büttner and Martina Bandte (2023)
Studies on the potential of the basic substance chitosan in managing Podosphaera pannosa on cutting roses and Erysiphe polygoni on French hydrangea
Journal of Plant Diseases and Protection 130 (3), 579-586
Abstract: Horticultural production systems have to move forwards to an environment-friendly and sustainable plant production. Basic substances can be added to reduce the use of synthetic plant protectant in conventional plant protection strategies. Regarding the protection of ornamental plants, less is known about the usage and behaviour of these alternative strategies and components. In our study, an infection of Podosphaera pannosa and Erysiphe polygoni in two different cultivars of cutting roses and one cultivar of French hydrangea was investigated. We studied the effect of a weekly foliar treatment of the basic substance chitosan (0.05 g/m²) compared to a water control and potassium hydrogen carbonate (VitiSan, Biofa GmbH, Münsing, Germany) in both production systems. As a result, in cutting roses as well as in French hydrangea, we found a significantly decreased infected leaf area following the use of chitosan and VitiSan compared to the water control. In both treatments, we found a stronger effect in French hydrangea, compared to roses. Results also indicate that the basic substance chitosan has to be used at a low pathogen level. We present a promising approach to reduce conventional plant protectants in ornamental plant production.
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Database assignments for author(s): Carmen Büttner

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Podosphaera pannosa	Rosa (crop)	Germany
	Erysiphe polygoni	Hydrangea (crop)	Germany