Figure 3-55. Rot of timber pile.
time, the animal orients its body parallel to the grains of the timber member. A calcium-like white excretion is left behind on the walls of the burrow track. As the exterior timber deteriorates via other means, these white trails become an obvious indication of shipworm presence. Eventually, the interior of a timber pile or beam under shipworm attack will become completely riddled with burrows, although externally no evidence of attack is apparent.
In tropical climates, shipworms have been known to grow to 6 feet in length and as much as 3 inches in diameter. In temperate climates, such as North America, shipworms generally range between 6 to 8 inches in length and about 1/2 inch in diameter. Figure 3-56 illustrates the damage caused by shipworms.
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