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Symptom Identification and Control Methods of Root Rot in Codonopsis pilosula

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The pathogen is a type of imperfect fungus among the fungi, and it is divided into two types: chronic onset and acute onset. In the chronic type, the disease begins in mid to late May. In the early stage of the disease, dark purple lesions appear on the lower fibrous roots or lateral roots, which then turn black and rot. After the disease spreads to the main root, it gradually rots from bottom to top. The remaining unrotted part is mostly a "half-section ginseng," and the area near the rotted part is dark brown. The stems and leaves above ground gradually turn yellow and eventually die. In the acute type, the disease mostly begins in mid to late June. Once the ginseng root is infected, almost the entire ginseng root becomes diseased at the same time

The pathogen is a type of imperfect fungus among the fungi, and it is divided into two types: chronic onset and acute onset. In the chronic type, the disease begins in mid to late May. In the early stage of the disease, dark purple lesions appear on the lower fibrous roots or lateral roots, which then turn black and rot. After the disease spreads to the main root, it gradually rots from bottom to top. The remaining unrotted part is mostly a "half-section ginseng," and the area near the rotted part is dark brown. The stems and leaves above ground gradually turn yellow and eventually die. In the acute type, the disease mostly begins in mid to late June. Once the ginseng root is infected, almost the entire ginseng root becomes diseased at the same time, showing a water-soaked appearance, the texture becomes soft, and the vascular bundles turn light brown. After a few days, the entire ginseng root soft-rots. On the rotted parts, a small amount of grayish-white mold-like substance can be seen.

Control measures: implement crop rotation and avoid continuous cropping; carefully select seeds before sowing, remove diseased seeds, disinfect the seeds, and use healthy, pest- and disease-free Codonopsis pilosula plants as transplant seedlings; do a good job of drainage and waterlogging prevention during the rainy season; during the disease period, spray with 200-fold dilution of 50% dinitro dispersant, or irrigate with 1500-fold dilution of 50% thiram wettable powder.

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