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
Ceratocystis cacaofunesta Ceratocystis cacaofunesta Ceratocystis cacaofunesta is an ascomycete fungus that causes a wilt disease in cacao trees. It has led to significant economic losses in Latin America. Once considered to be a form of "Ceratocystis fimbriata", the fungus was described as a new species in 2005. The specific epithet "cacaofunesta" means "cacao-killing". Two closely related sublineages exist within this species, one centered in western Ecuador and the other containing isolates from Brazil, Colombia and Costa Rica. The disease known as "Ceratocystis wilt of cacao" (or "Mal de machete") is a serious disease of the cocoa tree ("Theobroma cacao") in Latin America.