Cycle 72 Operations: Hain

Suite: Sulu Coffee — Kahawa Sūg (cycles 71–74) Role this cycle: LEAD Focus: How the Coffea canephora species resistance allowed Sulu’s Robusta to survive the Hemileia vastatrix epidemic that destroyed Philippine Arabica in Batangas and Cavite — the defining moment of Kahawa Sūg’s historical differentiation.

Key Findings This Cycle

• ANCHORED: Coffea canephora (Robusta) possesses significantly greater resistance to Hemileia vastatrix (coffee leaf rust) than Coffea arabica. This species-level resistance is endogenous — it requires no treatment, quarantine, or human intervention.
• ANCHORED: Coffee leaf rust reached the Philippines in the 1880s and devastated the Arabica plantations of Batangas and Cavite in 1889. Production dropped to one-sixth of peak within two years. The northern Philippine coffee industry effectively collapsed.
• ANCHORED: Between 1887 and 1889 the Philippines briefly became the world’s sole coffee supplier (when Java and Brazil were also hit by the epidemic). Batangas Arabica sold at five times the price of other Asian varieties during this window. Then the blight arrived in the Philippines and that advantage was destroyed.
• ANCHORED: Sulu’s Robusta plantations, protected by canephora resistance, remained intact through the epidemic. This is the defining moment of differentiation: while northern Philippine coffee was destroyed, Kahawa Sūg survived.
• HISTORICAL STRUCTURE ANCHORED: Schück’s 1864 decision to plant Robusta was driven by climate practicality, not foresight about a future epidemic. Yet it functioned as a 25-year biological hedge against precisely the pathogen that destroyed the rest of Philippine coffee. This is the central historical irony of Sulu coffee.

Disposition Status

All findings reviewed and carried forward to the suite synthesis at Cycle 74.