Chocolate lowland climate in the narrow band of latitudes where cacao is grown (20 degrees north and south of the equator), the commercial company Mars, Incorporated and the University of California, Berkeley are conducting genomic research in 2017–18 to improve the survivability of cacao plants in hot climates. Chocolate is made from cocoa beans, the dried and fermented seeds of the cacao tree ("Theobroma cacao"), a small, 4–8 m tall (15–26 ft tall) evergreen tree native to the deep tropical region of the Americas. Recent genetic studies suggest the most common genotype of the plant originated in the Amazon basin and
Moniliophthora perniciosa cacao beans annually. "T. cacao" L. is an understorey tropical plant, and the understorey growth of cacao helps to preserve habitat for numerous animal and bird species in these regions. With the production losses associated with WBD, tropical landowners are forced to convert their land to other production systems that usually require the destruction of the forest cover. WBD does not only affect the supply of cacao, but also largely impacts the conservation of tropical environment where cacao is grown. Moniliophthora perniciosa Moniliophthora perniciosa (previously "Crinipellis perniciosa") is a fungus that causes "witches' broom disease" (WBD) of the cocoa tree