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Here is a link that has a good image of the budding stage of Wisteria.
http://www.commonweeder.com/category/vines/page/2/

I hope that there is peace!

Either spring or fall are fine times to plant wisteria.

There can be a few reasons for the yellowing leaves. Watering issues; to much or to little.
Insects or fungus and even nutrient issues.

I do see mottling in the coloring of the leaves which does appear to be Tobacco Leaf Mosaic Virus.
You can try applications of a fungicide.

Here are some links with more information.

https://www.gardeningknowhow.com/plant-problems/disease/tobacco-mosaic-disease.htm

https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-with-yellow-leaves.htm

This article will help you with this task.

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

Though there are some differences in how aggressive American or Chinese Wisteria, you are still dealing with an aggressive vine. The root system is just as aggressive as the top of the plant.
Do not plant near wells, foundations and septic systems.

https://www.gardeningknowhow.com/ornamental/vines/wisteria/controlling-or-getting-rid-of-wisteria.htm

Wisteria can be pruned back quite a bit (hard pruning) if it has become overgrown, and this will bring it back to a healthy size. There's no need to remove the plant as long as you are willing to maintain it by pruning as described in these articles:

https://www.gardeningknowhow.com/ornamental/vines/wisteria/pruning-wisteria.htm
https://www.rhs.org.uk/advice/profile?pid=242