FROM PATHOGEN ERADICATION TO FUNCTIONAL RECOVERY: AN INTEGRATED MOLECULAR DIAGNOSTIC RHIZOSPHERE BIOLOGY FRAMEWORK FOR PRODUCTIVE CONTINUITY IN ENDEMIC FUSARIUM ODORATISSIMUM (TR4)-AFFECTED CAVENDISH BANANA SYSTEMS

Abstract

Fusarium wilt of banana caused by Fusarium odoratissimum (Tropical Race 4; TR4) remains one of the most consequential biological threats to global Cavendish banana production. Management strategies have traditionally emphasized exclusion, biosecurity, eradication, and the development of resistant planting materials. However, once TR4 becomes established under endemic production conditions, the challenge extends beyond pathogen avoidance toward sustaining productive agricultural systems despite persistent disease pressure. A four-year multi-site field investigation was conducted across approximately 30 hectares of commercial Cavendish production systems in Mindanao, Philippines, representing a production landscape of more than 50,000 plants distributed across lowland, midland, and highland agroecological zones. Within this landscape, approximately 5,000 plants were molecularly confirmed as TR4-positive and formed the primary study population. The study evaluated an integrated Molecular Diagnostic–Rhizosphere Biology Framework combining rhizosphere-targeted biological intervention, multi-enzyme rapid molecular diagnostics, and satellite-based landscape monitoring.  Satellite-derived vegetation and productivity indicators were incorporated as independent landscape-scale measures of production continuity, enabling multi-scale assessment of disease dynamics, canopy vigor, and productive function across heterogeneous field environments. Treatment performance was evaluated using site-adjusted statistical models, survival analysis, and spatial epidemiological approaches. Across diverse agroecological environments, Functional Recovery was observed in 4,987 of 5,000 molecularly confirmed TR4-positive plants (99.74%; 95% CI: approximately 99.57–99.85%). Recovery occurred through two distinct pathways: curative recovery (2,995/3,000; 99.83%) and preventive recovery (1,992/2,000; 99.60%). The overall collapse rate was 0.26% (13/5,000 plants). These outcomes were observed under molecularly confirmed pathogen presence and across multiple production environments, suggesting that productive continuity may be achievable even where pathogen elimination is no longer feasible.   To our knowledge, this represents one of the largest field-scale evaluations of productive continuity under molecularly confirmed TR4-positive conditions in commercial Cavendish banana systems. Preservation of productive function reduced the risk of premature field abandonment and supported continuity of productive hectares, thereby mitigating agronomic and economic losses commonly associated with endemic TR4 pressure. Based on these observations, this study proposes Functional Recovery as a complementary management outcome measure  for Cavendish banana systems affected by endemic TR4. Functional Recovery is operationally defined as the capacity of a production system to preserve productive function, biological resilience, and economic continuity despite confirmed pathogen presence. The findings support a broader re-examination of success metrics in TR4 management. In endemic production systems, agricultural success may need to be evaluated not solely through pathogen absence, but through the ability of production systems to sustain productive function under persistent disease pressure. Rather than replacing exclusion, containment, or resistance-based approaches, Functional Recovery is proposed as a complementary Fusarium wilt of banana caused by Fusarium odoratissimum (Tropical Race 4; TR4) remains one of the most consequential biological threats to global Cavendish banana production. Management strategies have traditionally emphasized exclusion, biosecurity, eradication, and the development of resistant planting materials. However, once TR4 becomes established under endemic production conditions, the challenge extends beyond pathogen avoidance toward sustaining productive agricultural systems despite persistent disease pressure. A four-year multi-site field investigation was conducted across approximately 30 hectares of commercial Cavendish production systems in Mindanao, Philippines, representing a production landscape of more than 50,000 plants distributed across lowland, midland, and highland agroecological zones. Within this landscape, approximately 5,000 plants were molecularly confirmed as TR4-positive and formed the primary study population. The study evaluated an integrated Molecular Diagnostic–Rhizosphere Biology Framework combining rhizosphere-targeted biological intervention, multi-enzyme rapid molecular diagnostics, and satellite-based landscape monitoring.  Satellite-derived vegetation and productivity indicators were incorporated as independent landscape-scale measures of production continuity, enabling multi-scale assessment of disease dynamics, canopy vigor, and productive function across heterogeneous field environments. Treatment performance was evaluated using site-adjusted statistical models, survival analysis, and spatial epidemiological approaches. Across diverse agroecological environments, Functional Recovery was observed in 4,987 of 5,000 molecularly confirmed TR4-positive plants (99.74%; 95% CI: approximately 99.57–99.85%). Recovery occurred through two distinct pathways: curative recovery (2,995/3,000; 99.83%) and preventive recovery (1,992/2,000; 99.60%). The overall collapse rate was 0.26% (13/5,000 plants). These outcomes were observed under molecularly confirmed pathogen presence and across multiple production environments, suggesting that productive continuity may be achievable even where pathogen elimination is no longer feasible.   To our knowledge, this represents one of the largest field-scale evaluations of productive continuity under molecularly confirmed TR4-positive conditions in commercial Cavendish banana systems. Preservation of productive function reduced the risk of premature field abandonment and supported continuity of productive hectares, thereby mitigating agronomic and economic losses commonly associated with endemic TR4 pressure. Based on these observations, this study proposes Functional Recovery as a complementary management outcome measure  for Cavendish banana systems affected by endemic TR4. Functional Recovery is operationally defined as the capacity of a production system to preserve productive function, biological resilience, and economic continuity despite confirmed pathogen presence. The findings support a broader re-examination of success metrics in TR4 management. In endemic production systems, agricultural success may need to be evaluated not solely through pathogen absence, but through the ability of production systems to sustain productive function under persistent disease pressure. Rather than replacing exclusion, containment, or resistance-based approaches, Functional Recovery is proposed as a complementary management endpoint that expands TR4 evaluation from pathogen-centered outcomes toward preservation of productive agricultural systems under endemic disease conditions.   Unlike conventional TR4 management strategies that primarily evaluate pathogen suppression or exclusion, the present framework evaluates preservation of productive function despite molecularly confirmed pathogen presence.