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This could be insect damage or leaf spot.

Here is a link that will help you identify and how to treat.

https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-diseases.htm

An open windy area would not be a good situation for Wisteria. The drying wind would certainly take it's toll on nearly any plant.
You may want to start the landscaping with larger trees and shrubs to create a backdrop for smaller or more tender plantings.

https://www.gardeningknowhow.com/ornamental/vines/wisteria/growing-wisteria-proper-wisteria-vine-care.htm

You likely have to much Nitrogen in the soil.
You can add Phosphorous with a Bone Meal fertilizer.

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/too-much-nitrogen-soil.htm

If you are trying to control or kill off the Wisteria, cutting the plant down and painting the cut ends with a herbicide instead of spraying the plant.
Here are some links with more information.

https://www.gardeningknowhow.com/ornamental/vines/wisteria/controlling-or-getting-rid-of-wisteria.htm
https://www.gardeningknowhow.com/plant-problems/weeds/using-herbicide-in-gardens.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/how-long-does-weed-killer-last-in-the-soil.htm

Nodes are where the stem with the leaves meet the main stem. It is from these junctions that the flowers grow from. If you look at the seedpods, you should see where they are attached and this is a node.

Once a main stem is severed, these leaf nodes will also sprout and will eventually become a main stems as well. It is a little like a hydra. Cut the main stem and then the next leaf node below this will sprout 2 main stems eventually.

Yes, there are general rules about pruning your Wisteria, but remember it is VERY difficult to seriously harm your vine.

You can inhibit blossoming by pruning incorrectly but if the plant is healthy for doing so , no harm.

Here is a refresher article for you.

https://www.gardeningknowhow.com/ornamental/vines/wisteria/pruning-wisteria.htm