System and climate related pythium problems in mobile chrysanthemum growing systems

C. Blok, R.H.M. Maaswinkel, T. Vermeulen, J.B. Campen, S.J. Paternotte, H. Shao

Research output: Chapter in Book/Report/Conference proceedingConference paper

2 Citations (Scopus)

Abstract

One Dutch greenhouse company started to grow chrysanthemums in a mobile system. The system’s basic unit is a sub-irrigated V-shaped gully of 8.0 m long and 5 cm wide, filled with a peat-coir mix. The system is hampered by growth differences along the length profile of the gullies and Pythium related yield reductions of up to 10% during the summer period. A series of experiments aimed to mimic the problems, explain causes and to advice on improvements. A Pythium ultimum pathogen from the grower was cultured in the laboratory and disseminated in the irrigation water tanks. In part of the cultivations the plants were subjected to high temperature and low air humidity treatments aimed at creating stress and Pythium susceptibility. Various plugs fit for transporting rooted chrysanthemum cuttings were tested as well. The results show that Pythium ultimum is initially the result of a too high water content in the first 10 days of the propagation phase. This was a direct consequence of precipitation of pure water by the mist system used to keep the relative humidity high. A related factor was a too low EC of
Original languageEnglish
Title of host publicationProceedings of the International Symposium on growing media and composting, Charlotte, NC, USA, June 1- 5, 2009.
EditorsM. Raviv
PublisherISHS
Pages41-49
Volume891
ISBN (Print)9789066057333
DOIs
Publication statusPublished - 2011
EventInternational Symposium on growing media and composting, Charlotte, NC, USA -
Duration: 1 Jun 20095 Jun 2009

Conference

ConferenceInternational Symposium on growing media and composting, Charlotte, NC, USA
Period1/06/095/06/09

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  • Cite this

    Blok, C., Maaswinkel, R. H. M., Vermeulen, T., Campen, J. B., Paternotte, S. J., & Shao, H. (2011). System and climate related pythium problems in mobile chrysanthemum growing systems. In M. Raviv (Ed.), Proceedings of the International Symposium on growing media and composting, Charlotte, NC, USA, June 1- 5, 2009. (Vol. 891, pp. 41-49). ISHS. https://doi.org/10.17660/ActaHortic.2011.891.3