Sphaceloma glycines

Sphaceloma glycines is a fungal pathogen belonging to the family Elsinoaceae, responsible for causing anthracnose in soybean crops. This pathogen is a significant concern for agricultural production as it affects both the quantity and quality of harvested seeds. The disease is distributed globally in areas where soybean is cultivated under warm and humid conditions.

The symptoms of infection appear on various parts of the plant, including leaves, stems, pods, and petioles. Initially, small brown or reddish spots develop, which later enlarge and turn into dark lesions. Under favorable conditions, the pathogen produces characteristic gray or brown acervuli, leading to pod blight, premature leaf shedding, and seed shriveling, significantly impacting overall yield.

The life cycle of Sphaceloma glycines involves survival as mycelium in infected plant debris left in the soil or on the seed surface. During the growing season, the fungus produces conidia, which act as primary inocula. These spores are spread through rain splashes and wind, infecting susceptible soybean tissues whenever moisture is sufficient.

Disease development is highly dependent on environmental factors. The pathogen thrives in warm temperatures ranging from 20°C to 28°C and high relative humidity. Frequent rainfall and prolonged leaf wetness create the ideal environment for conidial germination and rapid colonization of the host plant, often leading to severe epidemic outbreaks.

Effective control strategies require an integrated pest management approach. This includes the use of disease-free, certified seeds, application of effective seed treatments, and the selection of soybean varieties with known resistance to anthracnose. Additionally, rotating crops with non-host species and implementing sanitation measures to remove infected crop residue are crucial for suppressing the primary inoculum.

• Use of certified, fungicide-treated seeds.
• Planting resistant or tolerant soybean cultivars.
• Implementation of 3-year or longer crop rotation cycles.
• Effective management of field moisture and weeds.
• Application of foliar fungicides at critical growth stages.