A change to just two DNA letters reduced disease in cacao by about 42% under laboratory conditions, suggesting a possible way to protect future chocolate harvests.

Black pod disease is estimated to reduce cacao yields by roughly 30% worldwide, threatening the livelihoods of farmers who grow the crop used to make chocolate. Shifting weather patterns and other environmental stresses are making production even more difficult. With millions of farmers depending on cacao, these pressures are raising concerns about the future of the global chocolate supply.

Scientists at Penn State have developed a new variety of cacao that shows significantly improved resistance to black pod disease in laboratory tests. The researchers used gene editing and traditional breeding to strengthen the plant’s natural defenses, offering a potential way to reduce losses without introducing foreign DNA into the final plant. The promising results are now moving toward field testing and possible commercial production.