How to tell when durian is ripe enough
Ripeness decides whether goods reach the buyer in good condition or spoiled. No single sign is perfectly reliable, so practitioners combine several at once and agree the ripeness level with the buyer in advance.
Signs commonly used
- Days from fruit set: the number of days from fruit set to harvest, with a different benchmark for each variety.
- Husk and spines: husk colour, how far the spines open and the spacing between them.
- Stem: colour and dryness of the stem, and small cracks at its base.
- Tap sound: the sound when tapping the husk; experienced people can tell young from mature fruit.
- Smell: the typical aroma that appears as the fruit nears ripeness.
- Sampling: cutting open representative fruit from the orchard or batch to look at flesh and seeds.
Why not rely on one sign
Husk colour and spine opening vary by variety, growing area and weather. A fruit that looks ripe outside can still be immature inside, and the reverse. So compare several signs and check samples.
Ripeness at harvest differs from ripeness on receipt
For goods that travel several days, fruit is usually harvested at a lower ripeness than a consumer would want, so that it reaches the right ripeness on arrival. The ripeness at cutting should be worked back from the expected transit time, the variety and the season.
What to write into the acceptance criteria
- The ripeness wanted at harvest and on receipt.
- How samples are taken and how many fruit are checked per batch.
- The permitted share of immature or over-ripe fruit and how it is handled.
- The time of stem cutting recorded in the batch file.
Frequently asked questions
Does cutting durian too early affect quality?
Yes. Fruit cut too young is usually less aromatic and sweet once ripe. Ripeness has to balance quality against transit time and be agreed with the buyer.
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