Yellow spots on wisteria leaves

Question

My otherwise healthy young wisteria has yellow spots on lower, older leaves which is spreading. Is it root rot or something else? Looks like fungus. How should I treat it, please? Thanks so much.

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Answer 1

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