Termites build tubes
Termites build these tubes for several reasons, to protect them from air and sunlight and to protect them predators. They go in search for wood and when they find it they let the others know where the food is. They work 24/7/365 and even in the case above they might think they are heading for wood, they won’t find any here so eventually they will give up and move along.
They are small about 1/4 inch but it’s their numbers that make the difference, here in Arizona probably between 100,000 and 250,000 all working towards the goal of feeding everyone.
So keep a look out and if you see anything like this please give ProBest Pest Management a call at 480-831-9328