Some New Ideas in Tree Care

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Figure 1
Dissection of a poorly healed large branch stub on a paper birch. Poorly healed stubs are major external indicators of decay.
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Figure 2
Dissection of a maple with a dead basal sprout. The decay in the sprout stub was compartmentalized, and it did not spread into the main trunk.
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Figure 3
The Shigometer and accessories for detecting decay in trees. A 3/32-inch hole is drilled into the tree with a battery-powered drill. A special probe is inserted into the hole, and the electrical resistance of the wood at the probe tip is recorded on the meter. When the probe tip moves from sound to decayed wood, there is an abrupt decrease in resistance.