I have 15 Eugenia trees planted one year ago. One has developed bumps on the stem. How do I treat this?

Question

Would like to stop this spreading to the other trees…

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Answer 1

Those are a type of insect known as "scale". These are very aggressive, and develop a shell to protect it from pesticides. You will have to scrape off as many as you can and then treat with something such as neem oil, or other insecticides.

This article will help: https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm