Q.Lime tree borers in Thailand
Some of my lime trees – maybe 5-6 metres tall and with 5cm diamter branches have piles of sawdust under, presumably from borers. I can push wire up along some of these holes as much as 40 cm. How can I treat something so far inside the branches?
Certified GKH Gardening Expert
Unfortunately, this is a difficult subject. Once they are inside the tree, they will do extensive damage. The best method of control is prevention, and once they get inside it can be hard to treat, often resulting in the death of the tree. Here is an article for more information: https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-borer-insects.htm