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It looks like we’ve been visited by damping off disease. We found this little zinnia seedling flopped over, and going brown from the base of the stem upwards.
It looks as though we have been lucky in that we only seem to have lost three zinnia seedlings to date. It can wipe out a patch of seedlings in a tray or spread to the whole tray or beyond.
What causes damping off?
Damping off is caused by several types of organism, particularly certain types of fungi and bacteria. They live in the soil and are usually carried by water.