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BACTERIAL SOFT ROT |
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Probably the worst hosta problem of all is bacterial soft rot
- the nuclear weapon of hosta diseases. Caused by a soil-borne
bacteria called Erwinia, it strikes with devastating speed
once the soil has warmed and continues to be a problem until
the soil has dried out in summer. Even a giant clump can be
killed in a week, with all the below- ground parts turned to
fishy-smelling soft mush. |
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The first sign of trouble in spring is shoots that stop developing,
and by then it's too late. Later in the season divisions just start
dying. Sometimes only part of the plant is hit and the rest can be
saved, but immediate action is necessary as it moves through the
plant very quickly.
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| In the
Garden: At
the first sign of trouble dig and clean any remaining parts that
seem healthy and dry them well in the sun. The bacteria need
moisture to survive. Dipping or spraying with Phyton will also help
the plant, but nothing can be done about it in the soil. |
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| In the
Nursery: If Erwinia is present in the nursery it can't be
eliminated. Dry any cut surfaces, and spray or dip with Phyton.
Dusting with agricultural streptomycin is also effective. Do not
wrap roots with wet paper and plastic. A warm humid environment in
the box makes for perfect conditions for Erwinia, so ship plants
dry. |
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