What physical indicator is described as the most reliable field marker for confirming the safety and ripeness of a harvested ackee fruit?

Answer

The fruit opening naturally on the tree (natural dehiscence)

Determining the precise moment of safe harvest for fresh ackee requires strict adherence to natural indicators, as premature picking is dangerous. The text emphasizes that the most dependable indicator of readiness, surpassing visual cues like color alone, is natural dehiscence—the way the fruit splits open on its own while still attached to the tree. This natural splitting signals that the fruit has reached maturity, allowing the safe, yellow arils to be separated. Never forcing open an ackee that remains closed is crucial because green or unopened fruits retain the highest concentrations of the dangerous hypoglycin toxins.

What physical indicator is described as the most reliable field marker for confirming the safety and ripeness of a harvested ackee fruit?
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