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What are the control methods for round spot disease of Panax notoginseng?

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It can damage all parts of the plant. In the early stage of leaf disease, yellow spots appear on the underside of the leaves. In humid weather or during continuous rainy days, they rapidly expand into transparent round spots. When the weather is dry after the disease occurs, the lesions are relatively large, round and brown, with obvious concentric rings. When the stems are affected, the damaged parts are chestnut-colored, and the diseased area has a grayish-white mold layer, which can cause bud rot and stem base rot. Control methods: First, during the epidemic season of round spot disease, open the ventilation doors of the Panax notoginseng garden to increase air flow and reduce humidity inside the garden. Second, adjust the light intensity for Panax notoginseng to avoid excessively strong light, which is conducive to the spread of the disease.

It can damage all parts of the plant. In the early stage of leaf disease, yellow spots appear on the underside of the leaves. In humid weather or during continuous rainy days, they rapidly expand into transparent round spots. When the weather is dry after the disease occurs, the lesions are relatively large, round and brown, with obvious concentric rings. When the stems are affected, the damaged parts are chestnut-colored, and the diseased area has a grayish-white mold layer, which can cause bud rot and stem base rot.

Control methods: First, during the epidemic season of round spot disease, open the ventilation doors of the Panax notoginseng garden to increase air flow and reduce humidity inside the garden. Second, adjust the light intensity for Panax notoginseng to avoid excessively strong light, which is conducive to the spread of the disease. Third, promptly remove plant residues. When diseased plants are found, remove them promptly, burn them in a centralized manner or bury them deeply, and at the same time spray 70% thiophanate-methyl wettable powder at 600-800 times dilution, or Antaisheng at 600 times dilution.

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