Caterpillar spot disease control method
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July 13 12:11:53, 2025
The roots of the affected plants showed brown and decaying symptoms, with visible spider-like mycelium growing on the infected areas. The leaves of the plants wilted, indicating severe stress.
The pathogen responsible for this disease is *Rhizoctonia solani* Kuhn, a fungus belonging to the subphylum Basidiomycota. It does not produce spores but spreads through its mycelium. This pathogen primarily resides in the soil or on infected plant tissues, and it causes damage by colonizing and spreading through the plant's root system.
Infestation occurs more frequently in seedlings grown in unsterilized garden soil. High soil moisture levels create favorable conditions for the development and spread of the disease.
To manage this issue, several control methods are recommended:
1. **Seedbed Soil Treatment**: Mix 5 grams of carbendazim with 25 kilograms of fine soil, and use this mixture for each square meter of the seedbed. Apply the treated soil both when sowing and after covering the seeds.
2. **Early-Stage Spraying**: In the early stages of infection, spray a 20% emulsifiable concentrate containing methyl thiophanate (Lictoria) diluted at a ratio of 1:1200.
3. **Root Rot Treatment**: When root rot or stem rot occurs, mix 72.2% polyoxin D (Previcur) at 800 times dilution with 50% propiconazole at 800 times dilution and apply as a foliar spray.
Proper sanitation, crop rotation, and maintaining good drainage can also help reduce the risk of *Rhizoctonia solani* infections. Regular monitoring of the plants and timely intervention are essential for effective disease management.