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Dry root is wood that tends to be very spongy and soft and crushes easy in hand. While the termite damage can also be crushed, it tends to have stringy wooden fibers between the areas in which were eaten by the insects.
You can also have Powder Post Beetle damage. This little bug creates very fine sawdust much like powder. The holes are very small pin head size in most cases, but the wood when scrapped with a screwdriver will appear just to disintegrate into dust.
Your best bet is to get a pest control person in there and have a look see. I suggest smaller companies over the big franchise ones as these people have much more to offer and are a bit more informed so they get things right. The larger companies are a inspection mill with one goal to sell treatments at a very expensive price.