are they ants? I have a citrus tree that tends to get colonized by ants and their little honeydew-producing aphids, the leaves get dirty-looking just like that. Look at the stems, undersides, places where the little buggers can hide.
I have cleaned the leaves with soapy water (not recommended, but it was effective), blasted the darn thing with water,, and sprayed with a garlic-oil-soap solution, but in the end what worked was really fertilizing the tree and putting ant barriers (vaseline-smeared aluminum foil collar on the trunk). I still find some icky leaves but the tree is a lot happier.
Location: Mae Hong Son, Thailand
posted 1 month ago
Tereza Okava wrote:are they ants?
Thanks, @Tereza I will have a closer look to see if it's ant - but I don't think so. I have never seen any ants on the leaves.