Macrophomina phaseolina

Macrophomina phaseolina (syn. Sclerotium bataticola) is a destructive soilborne fungal pathogen responsible for charcoal rot in a wide range of economically important crops. It is classified within the kingdom Fungi and causes significant global yield losses in major agricultural regions.

The host range of this pathogen is extensive, exceeding 500 plant species. Key crops such as sunflower, soybean, maize, sorghum, and bean are highly susceptible to infection. The fungus invades the root system, colonizing the vascular tissues and effectively cutting off water and nutrient translocation, which leads to sudden plant wilting and premature death.

The life cycle of the pathogen is characterized by the production of numerous microsclerotia, which serve as the primary survival structures. These microsclerotia can remain dormant in the soil or crop debris for several years. When environmental conditions are conducive, they germinate and penetrate the host's roots, allowing the mycelium to spread rapidly through the plant tissues.

Disease development is strongly favored by heat and drought stress. The pathogen is most aggressive at soil temperatures ranging from 28°C to 35°C combined with low moisture levels. High soil temperatures weaken the plant's defense mechanisms, providing an ideal window for the fungus to establish systemic infection.

Managing Sclerotium bataticola requires an integrated approach to reduce inoculum levels in the soil. Effective control measures include:

• Rotating crops with non-host species.
• Using irrigation to mitigate drought stress during peak vulnerability.
• Planting resistant or tolerant cultivars.
• Applying seed treatment fungicides and maintaining balanced soil fertility.