Organic options for dealing with rose diseases

henry_kuskaAugust 21, 2010

"Q: Do you have an organic suggestion for black spot and rust on my San Francisco-grown roses?"

Question in newspaper article, see link below.

Here is a link that might be useful: link for above

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jean001(z8aPortland, OR)

Didn't read the piece.
But first & foremost is to choose a plant with known resistance, whether you're choosing a new rose to plant or looking for a replacement for a sickly one.

    Bookmark   August 22, 2010 at 1:34PM
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nastarana(5a)

Homemade baking soda sprays are toxic to soils?? Really? First time I ever heard that!

    Bookmark   January 18, 2011 at 10:22PM
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henry_kuska

The counter ion in normal baking soda is a sodium ion.

"Sodium ion
The roots of a plant can absorb sodium ion and transport it to the plant's leaves. From there, the sodium has nowhere else to go and typically accumulates. For some species, this accumulation of sodium causes no obvious symptoms. For others, especially such woody plants as azaleas, camellias, roses, and stone fruits, necrosis of leaves is a common result. Typically, this manifests as marginal scorching of the leaves or abscission (dropping) of the leaves.

Many species of plants also absorb sodium directly through their leaves, from water present on the leaves (resulting either from rainfall or from sprinkled irrigation water). If a plant absorbs more sodium by this pathway than it can tolerate, abscission of leaves is a common result."

Above quote taken from link below.

Here is a link that might be useful: Link for above

    Bookmark   February 17, 2011 at 3:40PM
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