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| Here's a better close up image or two of the nutrient problems with my knock out roses. See previous post to http://forums2.gardenweb.com/forums/load/roses/msg0613091021968.html?5 Sure looks like a nutrient problem to me, either excess or deficiency of something. I will check for drianage issues but I don't think it's that. Our walkway is next to the bed and I do use an ice melter over winter on the walkway (NaCl and MgCl blend) I wonder if that could be some of the problem, but then wouldn't all the roses in the same bed show similar symptoms? |
Follow-Up Postings:
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| Another image of problem |
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| Look for an ice melter with only calcium chloride. Sodium salts are harmful to plants, more so in gardens with heavy soils and low rainfall. Chlorides are not helpful, but all brands I have seen have chloride. There is no sign of salt poisoning in the images, however. I am still confused by the reddish veins, but yellowing of the new growth without distortion of growth patterns is usually iron deficiency. It can be caused by pH over 7 or cold, wet soil. Excessive phosphate fertilizer can contribute. It is not unusual for some plants to be chlorotic and others not. Multiflora rootstock and own-roots of some varieties have more trouble garnering iron than Dr. Huey rootstock. There can be local variation in pH. |
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| I see what you mean now about the reddish veins Michael... |
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