Schisandra root rot, also known as "bad ankle and neck disease," is a significant threat in the cultivation of Schisandra. This disease has become increasingly prevalent and causes severe damage to the plants. The infection typically occurs between early May and early August. At the beginning of the disease, the bark at the root and soil interface (the root and neck area) turns dark, and the cortex begins to rot and peel off. A ring-like lesion forms, leading to wilting of the leaves. Within a few days, the entire plant may die. The cause of the disease is closely related to physiological factors. During early spring and late autumn, the surface temperature fluctuates greatly, causing the tissues in the root and neck area to become soft and less resistant to pathogens. This makes them more susceptible to bacterial infections, which can lead to root rot.
The disease is more severe in heavy clay soils with poor drainage, where waterlogging is common. Plants that are over-fertilized or have not fully matured during the growing season are also more vulnerable. To manage this issue effectively, several control measures are recommended. First, it's important to choose well-drained loamy or sandy soils for planting Schisandra, avoiding low-lying areas prone to water accumulation. Second, implement comprehensive management practices by applying organic fertilizers and ensuring proper drainage during the rainy season. In autumn, before winter sets in, cover the roots with about 30 centimeters of loose soil to protect them from freezing. Third, avoid damaging the roots and stems during cultivation. Finally, when the disease is first detected, apply a 500-fold dilution of 50% carbendazim wettable powder to the roots, or use a 30% soil bactericide solution for irrigation. These steps can help reduce the spread and impact of the disease, ensuring healthier and more productive Schisandra plants.
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