Bourbon Mayaguez 139

Bourbon Mayaguez 139, often abbreviated as BM139, is a distinct selection within the broader Bourbon family of Coffea arabica. Its lineage traces back to the traditional Bourbon variety, which originated on the island of Bourbon (now Réunion) after being introduced from Yemen. The specific 'Mayaguez' designation refers to the USDA germplasm collection in Mayaguez, Puerto Rico, through which these plants transited before their eventual introduction to the African continent.

The journey of BM139 to East Africa began in the 1930s when it was introduced to the Mulungu germplasm collection in the Democratic Republic of Congo. By the early 1950s, the variety was brought to Rwanda. Upon its arrival in East Africa, agricultural researchers performed selection processes on the existing Bourbon population to identify mother trees that exhibited superior performance. This selection process resulted in the formal identification of two primary lines: Bourbon Mayaguez 71 and Bourbon Mayaguez 139.

In the field, Bourbon Mayaguez 139 is characterized as a tall, vigorous plant. It is noted for being highly productive, distinguishing it from some other traditional Bourbon selections that may offer lower yields. Like its parent variety, it is generally susceptible to common coffee diseases, which is a standard trait for many traditional Arabica cultivars. Its agronomic performance is highly regarded in the specific high-altitude environments of Rwanda and Burundi, where it has become a staple of the local coffee landscape.

For producers, the choice to plant BM139 is driven by a balance of productivity and quality. While it requires careful management due to its disease susceptibility, its ability to produce high-quality yields makes it a preferred choice for specialty-focused farms. In Rwanda, where Bourbon-derived varieties dominate the coffee sector, BM139 serves as a critical component of the national production, contributing to the country's reputation for high-quality, complex coffees.

From a sensory perspective, Bourbon Mayaguez 139 is celebrated for the classic attributes associated with the Bourbon lineage. Roasters and consumers often describe the cup profile as having excellent quality, frequently featuring notes of chocolate, caramel, and bright citrus or fruity undertones. Its versatility allows it to perform well across various processing methods, including washed and honey processes, which further highlight its inherent sweetness and complexity.

Today, the variety remains a vital genetic asset in East Africa. While newer, disease-resistant hybrids are constantly being developed, the enduring popularity of BM139 underscores the specialty coffee industry's continued reliance on traditional, high-quality cultivars. It stands as a testament to the historical movement of coffee germplasm and the subsequent local selection efforts that have defined the flavor profiles of modern Rwandan and Burundian coffee.