Just wondering the possible reason why the grape vine leaves are dying. The fresh leaves looks fine, though a bit yellowish. Here is some pictures.
Any suggestions to cure the vine? Thanks.
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1What is the root growing in, and what is the water supply?– Colin BeckinghamCommented Jul 4, 2019 at 6:18
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It is in a 24 inch deep raised bed soil. The watering is from below through sub irrigation system. Could it be the red blotch and rolling leaf disease caused by potassium deficiency or virus? I feed it with 10-10-10 about 1 month ago. The soil PH level is about 7.– JasperCommented Jul 4, 2019 at 19:28
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1 Answer
As you suggest it looks like a deficiency more than a disease or virus. Good clean new foliage and dying old foliage suggests the vine is stealing nutrients from the old to feed the new. If this is so, a broad spectrum treatment such as compost or rotted manure might be a better choice than NPK.
Check the quality of the incoming water for additives such as chlorine - ideally that sort of thing should be allowed to evaporate before coming in contact with roots but unless there is special provision for this a sub irrigation system can be problematic. Check University of Maryland for more info on chlorine and plants.
answered Jul 4, 2019 at 23:52
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Thanks for the suggestions. I treated it with 0:1:1 NPK nutrition solution and now all leaves turn to much more greener. There is no new yellow leaves appeared. Your guess is very accurate.– JasperCommented Jul 12, 2019 at 18:02