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. enter image description here

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Any suggestions to cure the vine? Thanks.

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    What is the root growing in, and what is the water supply? – Colin Beckingham Jul 4 '19 at 6:18
  • 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. – Jasper Jul 4 '19 at 19:28

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.

  • 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. – Jasper Jul 12 '19 at 18:02

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