Are These Eggs On My Basil Plants?

Question

Or are they something else, e.g., a fungus? And how do I treat & prevent? They’re massed all over the stems, and they’re hard.

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Answer 1

They are galls, likely, full of eggs. I'm not familiar with that particular gall, but insecticides will prevent them in the future. Here is a collection of articles that will help:

https://www.gardeningknowhow.com/plant-problems/pests/pesticides