..
> 1)Wood chip mulch(unrotted) would certainly rob nitrogen from the top
> soil layers.This is a well known fact to gardeners,who cannot get
> anything growing on wood chip added soil,but can as soon as nitrochalk
> is added;the effect is sometimes almost immediate.

Total nonsense.

> 3)The quote from Cox,which I have,that mulching encourages some late
> growth,and may hinder ripening is interesting.

Total ignorance.

> 4)My vines this year are very healthy,and possibly with a darker green
> leaf this year.This maybe an indication of too much nitrogen .

Total nonsense.

> 5) The bottom line is that my vines and grapes look extremely healthy
> this year,with a great crop on.They are ripening slowly and withou any
> sign of disease moving in yet.

Finally something that makes sense.

Another thing I did this year is to put
> several wasp jars(containing beer) around the vines-I must have killed
> a couple of thousand wasps over a few weeks.I am sure that in previous
> years wasps begin to attack the grapes in early August-they nibble a
> grape or two which rot,and this spreads to the rest of the bunch.A
> similar thing happens regularly with plums.

Total nonsense. Bees don't damage grapes.