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How to deal with root nodule disease in cherry blossoms? Detailed explanation of prevention and control methods

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Last spring, when planting cherry blossom seedlings, the author found that the roots of some plants had nodular growths. Their symptoms were varied in shape and size, brown to dark brown in color, with rough surfaces, and some showed cracked patterns. The affected areas were on the ground or near the root crown at ground level, and at the graft union between the rootstock and the scion. Affected plants showed poor growth and stunting. After identification and diagnosis, the author believes this is root nodule cancer disease, and the seedlings should be treated before planting. The methods are: 1. For suspicious seedlings, soak the roots in a 1% copper sulfate solution for 5 minutes,

Last spring, when planting cherry blossom seedlings, the author found that the roots of some plants had nodular growths. Their symptoms were varied in shape and size, brown to dark brown in color, with rough surfaces, and some showed cracked patterns. The affected areas were on the ground or near the root crown at ground level, and at the graft union between the rootstock and the scion. Affected plants showed poor growth and stunting. After identification and diagnosis, the author believes this is root nodule cancer disease, and the seedlings should be treated before planting. The methods are:

1. For suspicious seedlings, soak the roots in a 1% copper sulfate solution for 5 minutes, rinse, and then plant.

2. For plants with root cancer, cut off the root cancer, apply a 0.1% mercuric chloride solution to the wound, and then plant.

3. When planting, mix ferrous sulfate with the soil to change the soil acidity.

4. According to its disease pattern, avoid mechanical damage when grafting, digging, and transporting seedlings, so the chance of pathogen invasion can be reduced. When planting and propagating seedlings, do not plant them together with or near flowers and trees such as Chinese roses, peaches, and citrus, because the pathogen has a broad host range and can simultaneously infect these flowers and trees.

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