My Concord grapes are dying before they turn purple!

Discussion in 'Grape Growing & Vineyard Forum' started by GrapeMaster69, Jul 12, 2018.

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  1. GrapeMaster69

    GrapeMaster69 Junior

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    So this is the 5th year that my grapevine has been growing and every year I get a really good amount of healthy grape growth in the beginning but almost all of them shrivel up and die before they fully ripen to a the purple wine grape that they are supposed to. This has happened every year around this time (July) and even earlier. I am growing them on Long Island, NY. Please look at the pictures, you will notice how they start to turn purple but then look like they rot out and then finally they shrivel up and fall off. They only spray I use is a very light spraying of stylet oil (this year I only applied once). My soil is very alkaline so this year I attempted to make it a little more acidic by adding holly tone. Any advice would be greatly appreciated, thank you!
     

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  2. balatonwine

    balatonwine The Verecund Vigneron

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    Photos 1 and 3, I would say anthracnose. You are not applying enough of the correct fungicide.

    Photo 2 berries not formed due to pollination problems.
     
  3. BigH

    BigH Senior Member

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    My vote is black rot for photo 1 and anthracnose for 3. The Iowa State viticulture specialist recommend a dormant application of liquid lime sulfur to deal with my anthracnose problem. Early mancozeb sprays when shoots are 1 to 3 inches helps.

    H
     
  4. KevinL

    KevinL Member

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    My opinion for 1 and 3 Black Rot and Anthracnose. respectively. I had a big problem with both last year until I started a spray rotation this year.
     
  5. GrapeMaster69

    GrapeMaster69 Junior

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    What are you spraying and what is your rotation schedule?
     
  6. GrapeMaster69

    GrapeMaster69 Junior

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    I live on Long Island, NY are we in the same region? If not, can you direct me to where I can find the right application info for my growing region? Thanks!
     
  7. GrapeMaster69

    GrapeMaster69 Junior

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    What would be the correct fungicide? And how do pollination problems come about?
     

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