I observed some kind of drool on some of my plants, it looks like "spit", is it serious? (Dominica 62)
This is definitely the frothy leafhopper.
It is a parasite, often not very offensive but which can be treated with a traditional insecticide.
It is sufficient at first to clean the plant with water jet in order to make the maximum of this drool leave, and then treat it with the insecticide.
Preferably choose a biological method of insect treatment.