Aril tip burn, or sometimes referred to as burnt seed, is a condition whereby a part of the durian flesh turned brown in colour.
This can resemble the aftermath of a worm attack. But it is not, and more benign than an infestation.
The simple evidence is that people often still consume parts of a pulp with aril tip burn where they appear fine. But no one would eat an infested pulp.
Aril tip burn is caused by a problem with too much or too little nutrition.
A lot of factors go into what caused the issue in the first place and is not necessarily the fault of a farmer’s neglect. However, it would be the farmer’s job to investigate what went wrong and rectify the problem before the bulk of the harvest gets affected.