marquette nutrient defiency or fungus

Discussion in 'Grape Growing & Vineyard Forum' started by wood1954, Aug 11, 2019.

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  1. Aug 11, 2019 #1

    wood1954

    wood1954

    wood1954

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    I planted my Marquette grapes 4 years ago in sandy soil. The soil test result indicated I needed potassium and phosphorous I put about a 1/4 cup around each plant in the spring of 10-10-10 fertilizer and things went well lots of growth and then the vines seemed to pause and two got very pale green almost yellow and this one plant has either N or FE deficiency. So, a couple questions, first what deficiency do they have and or is it that or fungus, if deficiency can I fertilze this late in the summer? I think the first photo is potassium def. the smaller pic is either N or FE and the plant has been struggling it's entire life.
    also on another topic, these grapes put out some 10-12' bull canes that I cut back to midway between plants, my plantings are about 8' apart. was that a mistake or not. Thanks
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  2. Aug 12, 2019 at 12:36 AM #2

    ibglowin

    ibglowin

    ibglowin

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    You in WI right? Hard to believe but looks like your pH in the soil is off which effects the vines ability to properly take up and convert nutrients (photosynthesis) Usually something with ferrous sulfate is applied which lowers the pH in the soil and then things return to normal. I have had good luck with anything with ferrous sulfate on the label.
     
  3. Aug 12, 2019 at 4:36 AM #3

    BigH

    BigH

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    I vote Iron Chlorosis or Nitrogen deficiency. Potassium deficiency would present as orange/brown discoloring of leaves. Since you had bull canes, Nitrogen deficiency seems a little less likely. Iron problems usually appear in young leaves first.

    What was the pH from your soil test? Has it been excessively dry or wet there? Nitrogen is highly mobile in soil when water is present. If your soil test pH was below 6.5, then I would consider hitting these with a fertilizer that is heavy on Nitrogen, such as 28,0,3, and then watering that in. This is not normally a good time of year to apply Nitrogen, but you may not have a choice. You might want to give them a shot of water if it has been really dry. That may allow the plant to take up some nutrients that are already there. If it has been crazy wet, then you can lose nitrogen to leeching. Not much you can do about that other than fertilizing and letting it soak in.

    Plan on getting a new soil test this fall if you haven't done one since you planted the vines.

    H
     
  4. Aug 13, 2019 at 5:19 PM #4

    wood1954

    wood1954

    wood1954

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    I decided to pay the $40 and have a petiole analysis done then I'll know for sure.
     
  5. Aug 14, 2019 at 1:15 AM #5

    Masbustelo

    Masbustelo

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    Let us know the results
     

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