There's some drama about Maduro hyping it as a Venezuelan COVID cure, but I can't find anything about it. Besides (per Wikipedia) maybe it's a synonym for carvacrol/isothymol. Capitalist stranglehold on science suppressing the facts or is he actually just telling everyone to drink oregano oil?
It's not just trees, there's some studies about "parasitic mycorrhizae" that show they're only parasitic when you look at one time point. For example, a seedling of a herbaceous plant can "steal" carbon from a neighboring mature tree with mycorrhizae to get established, but then when that plant is more mature it gives carbon back to other plants in the network.