Beautiful Angel Trumpet Plant, Small Yellow Insect With 2 Black Dots On Back.

Question

Does anyone know what this insect is and if it is the cause of the sick plant?

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Answer 1

I'm not familiar with the exact species of beetle, but it is likely the cause of your issues. There are many ways to control beetles, though. This collection of articles will help:

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

This article will help you with the care of your plant:

https://www.gardeningknowhow.com/ornamental/trees/brugmansia/care-for-brugmansia-outside.htm