Raspberry canes turning brown
My raspberries seem to be afflicted with the disease described below (phytophthora). However, I have quite sandy, well-drained soil. So based on that, a root rot seems unlikely. However, because of the sandy soil I have mulched, and water every day when the plants are fruiting (because I understand that raspberries are shallow-rooted). Do you think thatÃ¯Â¿Â½s the problem? How often should I water raspberries in sandy soil?
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Ã¯Â¿Â½ Posted by jean001 z8aPortland, OR (My Page) on
Fri, May 20, 05 at 1:26
Root rot -- by the fungus Phytophthora -- resides in the soil. The telltale symptom: the fruiting stems die.
A second fungus kills raspberry canes also. In this instance, it's a vascular wilt -- by the fungus Verticillium -- and kills the canes in their first year of growth.
So, I'd say that it's the root rot that is killing Roserobin's plants.
And here's the really bad news:
-- Both the above fungi reside in the soil.
-- No spray is helpful against either disease.
-- No soil treatment is available to get rid of either of these fungi.
-- The fungi will remain in the soil for many years.