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unripe grapes turning into raisins?

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susieqz

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in its forth year, my unk. arbor grape started about 40 bunches of red grapes. i removed half, as this seemed too much.
i only harvested 6 bunches.

all the rest shriveled up before ripening.

any ideas how to prevent this, this year?
 

salcoco

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did you use any type of spray program for diseases? suggest visiting you local farm agent for recommended spay chemicals or any garden shop might help as well.
 

susieqz

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thanks, sal.
iif chemicals must be used, i'll use them.

i do wish i knew what happebed tho,
i noticed wasps on the grapes n wondered id they sucked out the juices or if it was disease.
 
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treesaver

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Wasps are a real pita, especially when it is a warm fall. I have fought them for years, and try to eliminate all nests, but seems you always miss some. I found one, too late for my grapes, right under mu nose, but they didn't get a chance for a repeat performance! I have had bunches dry up on frontenac before, and couldn't come to a conclusion of what caused it. The frontenac ripens early enough, that wasps have never been an issue.....now birds in them are a different story! Good luck!
 

treesaver

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Yes, all types of wasps, even mud daubbers! What I have trouble with is they will bite the fruit and feed a bit on it, then go and do the same to another berry, and another.....then the flies move in and finish the job. Now there is a difference between a sucked out shell and a raisened berry! My frontenac that had raisened berrys, I believe the plant quit nourishing the bunch, but I have no idea why!
 
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