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Q.Plant loss (begonias) from Pythium?

Zone 6163 | Anonymous added on March 28, 2020 | Answered

I am only a home gardener and I grow a large number of begonias and over the past couple of months I have lost over 50 plants. They include mainly cane-like and rhizomatous types and they grow in different areas i.e. shade house and patio. I think it is a fungus/pathogen root rot type of problem and I have no way to stop it from spreading from plant to plant, my plants start off looking sad, droopy leaves, soft/rotting rhizomes and also may have mealy bug which I can treat. I do not over water my plants and practice good plant hygiene. I belong to a society but their help has been limited. I have read your section of Treating Root Rot but the problem persists. I have used different fungicides Anti Rot and Eco Fungicide. Once a plant is re-potted it seem to be even more susceptible to rot. I am very upset and looking for any advice that may help. Mainly I want to know how to stop it spreading. Removing affected plants does not stop the rot appearing in other plants.

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Certified GKH Gardening Expert
Answered on March 30, 2020
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