Quote:
Originally Posted by TreeSpecialist 
More than 25 years ago, Shigo convinced me the "phenomena of summer limb drop" was probably caused by bad work. Over the next 4 months, I dissected 60 limbs that dropped without warning, usually in the evening and with no wind.
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Not every time, but often in late spring and summer, I notice that limbs fall due to swollen wood shrinking in a decayed socket. In winter it's wet and swollen, and fits tight - same principle as oak barrels sealing when wet.
Warm weather arrives, the decayed wet wood shrinks, then falls. And more will fall with a following rain, that saturates the exposed limb with water weight, but not the protected pieced dried in the protected socket.
Each season has it's little things.