The termites you may see as dark brown nests high up in a tree are seldom pests of significance. But the main subterranean termites that do that 99% of the damage we mentioned earlier, will often nest inside the central ‘pipe’ or hollowed-out heart of a mature tree.
If at colonising flight time a termite couple find their way into a hollow tree through maybe a dead/broken-off branch or in through a scar from fire at the base, they could not possibly have better conditions. There’s plenty to eat, moisture and protection. A 50 metre travel to your home would not be out of the question.
If you have a large eucalypt, peppercorn or a mature fruit tree nearby, you should check it. Use an 15-20mm diameter auger bit long enough to drill into the centre of the trunk at about shoulder height. Drill at a slight downward angle and when you feel less resistance it will be because you have reached the pipe. As you pull the bit out, look to see if any termites are in the fluting. If not, you could slip in a long thin grass leaf into the drill hole, leave it there for a minute and withdraw it slowly. Termites may be found holding on, ‘attacking’ it. If still no live termites are found, come back in half an hour or next morning; if there is termite life inside, they will be repairing or have repaired the drill hole using their ‘mud’ mixture.
In this situation you don’t need to see live termites; it’s just more satisfying to know there actually is a colony inside that will be killed when you take the next steps…
- Re-open the drill hole if it has been repaired
- Using a watering can spout, pour at least 30-40 litres of a permethrin or a bifenthrin solution down into the tree. These insecticidal concentrations can be purchased from a local hardware store. They may be known by various brand names but the active ingredients are shown on the front panel of the label. They are insecticides and you should read the label for dilution and safety directions.