Concord Grapes budding but not growing
I have a very old vine. It has produced mass amounts of grapes, and covers a very large arbor.
Last year we got a very small harvest. Actually, it didn't really give us enough to consider it a harvest at all.
This year, we had plenty of blooms, and those all turned into small buds. The buds made us hopeful, but now that they're growing, it looks like the same thing is happening. Only a few buds on each bunch actually grow. The others just drop off.
I'm posting a couple of pictures below to show you what I mean. The first one shows a bunch that hasn't started growing yet. The next one shows that a few of the grapes are growing and the rest of the buds just withered or disappeared.
Hopefully someone recognizes this and can tell me what to do about it. I really appreciate anyone's thoughts. Thanks.
BTW--in case you haven't been able to tell from my post, I am not a gardener. I have the world's brownest thumb. But this vine was started by my dad and we always made grape jelly every year with the harvest. I really want to save this plant.