I have a ‘Sungold’ Buddleia and the leaves keep getting eaten by something and go yellow what is the problem.

Question

It is planted in sandy soil next to a Davidii Buddleia which is absolutely fine and doesn’t get eaten

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Answer 1

If you can include a photo, it would help me to identify the issue. It sounds like, though, that the cultivar next to it has a disease resistance unlike the one beside it. It sounds like shothole fungus.

This article will help: https://www.gardeningknowhow.com/plant-problems/disease/shot-hole-disease-fungus.htm