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ISHS Acta Horticulturae 221: Symposium on Horticultural Substrates and their Analysis

THE SUPPRESSIVENESS OF SPHAGNUM PEAT TO PYTHIUM SPP.

Author:   H. Wolffhechel
DOI:   10.17660/ActaHortic.1988.221.22
Abstract:
A method is described for measuring the receptivity of peat to root rot and damping-off caused by Pythium spp. Several sphagnum peat lots were screened according to this method, and large differences were found between the peat lots with respect to their receptivity to Pythium spp.

A suppressive peat lot was chosen for further investigations. Suppressiveness could be destroyed by treating the peat at 60°C for 30 min. Addition of benomyl also broke down the suppressiveness, whereas penicillin G and streptomycin had no effect. The results indicate that the suppressiveness is probably caused by antagonistic fungi.

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