When pistachio hulls split before the nuts are harvested, insects and fungi can get inside, damaging the nut, costing farmers money and contaminating the nuts. About 4% of the overall crop experiences hull split, but some cultivars can split as much as 40% under certain conditions.

https://www.dailydemocrat.com/2026/02/05/breakthroughs-for-preventing-pistachio-hull-split/

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