Abstract
Treatments of one and ten minutes were too short for all disinfectants against fungi in peat and plant debris. The best effect was achieved with a treatment of 90 min. Sodium hypochlorite (NaOCl) was the most effective and Korsolin and Virkon S were the least effective in the control of Fusarium culmorum and F. oxysporum. Virkon S (2%) was the most effective against Mycocentrospora acerina and Phoma foveata. Soaking for 15 min and 60 min in a disinfection suspension eradicated Botrytis cinerea and P. foveata totally from the contaminated plastic pots. Fusarium spp. were the most difficult fungi to disinfect and these were best controlled with formaline, lobac P, Menno-Ter-forte and sodium hypochlorite. lobac P, formaline, Menno-Ter-forte, Taloset and Virkon S were the most effective disinfectants against club rot (Plasmodiophora hrassicae). Washing under running water was not sufficient to eradicate club rot. Against Rhizoctonia -induced damping off of cauliflower the most effective disinfectants were formaline and Virkon S.
Highlights
Many plant diseases, which cause a decrease of yield and yield quality, survive on plant debris, growth substrates, mull debris, and greenhouse and storage structures for long periods
Menno-Ter-forte, formaline and Virkon S was sufficient to disinfect the smallest amount of peat (0.1 g)
100 % effect against Fusarium oxysporum mixed in peat was achieved only with
Summary
Many plant diseases, which cause a decrease of yield and yield quality, survive on plant debris, growth substrates, mull debris, and greenhouse and storage structures for long periods. It is essential to use disinfectants to prevent the spread of diseases by those routes. Disinfection of soil substrate is not at present topical, because new peat or other currently used substrates are free of diseases. Grey mould (Botrytis cinerea) is a common disease in vegetables and ornamental plants grown in greenhouses as well as in vegetable storages (Heinze 1974, Dennis 1983). Fusarium spp. are commonly encountered in vegetables.
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