My Poor Lemon Tree Made A Home For Weaver Ants (Kerengga)

I bought this lemon tree about 3 months ago. It was small then, only 1 branch with few leaves. Why ? I craved lemonade and lemons are expensive , about RM 2 each in Johor Bahru. Today, I learned something new, about the "kerengga", scientific terms "Oecophylla smaragdina". Initially I don't give them much notice, They are just ants that have nasty bites. I never thought they can weave a home out of leaves. Don't ants build ant hills? Am I that

naive? I first notice lots of "kerengga" crawling along the branches of my beloved lemon tree. I didn't even notice their nest at first. After a few days, the number of ants increased. At a closer look, it seems a few leaves were entwined together with a sort of silk attached to them. My hubby laughed when I told him about it. You "town girl", don't you know that these kerengga build nests in the trees ?" "No, I don't, I thought they build ant hills.........." I searched the internet for more information. Do they really build nests that can span few trees. In that case , I think I'll cut off the stalk with the ant's nests on it before they kill my poor lemon tree. By the way, they've build more than 3 nests now..........On the left here is my small lemon tree.