symptom diagnosis
White-spotted feather disease mainly damages the roots, mostly from fine branch roots, and gradually expands to the base of the main root, and rarely extends to the root neck and above the ground. Its main symptoms and characteristics are: white or off-white net-like or fluffy hyphae or hyphae are entwined on the surface of the diseased root, sometimes in off-white to gray-brown flannelette-like hyphae.
In the later stage of the disease, the cortex of the diseased root is rotten, and the xylem is rotten, but the cork is not rotten and is sheathed outside the root, and the rotten root has no special smell. Black granular sclerotia can sometimes be produced on the surface of decayed xylem. For mildly diseased trees, the tree vigor is weakened, the germination is late, and leaves fall early; for severely diseased trees, the branches die, and even the whole tree dies.
Pathogens and occurrence characteristics
White-spotted feather disease is a higher fungal disease caused by Rosellinianecatrix. The pathogen can infect various fruit trees, forest trees and crops such as apples, pear trees, peach trees, willow trees, elm trees, and peanuts. The pathogen survives the winter in the diseased plants, diseased residues and soil in the field, and the fungus cords and sclerotia can survive in the soil for 5-6 years.
In the orchard, it is mainly spread through the contact of diseased and healthy roots, the movement of diseased residues and soil with bacteria; long-distance transmission is the transportation of seedlings with bacteria. The pathogen can directly penetrate the root bark to infect and cause damage, and can also invade and cause damage from various wounds. Old orchards, old woodlands, riverbanks, and orchards rebuilt from ancient tomb cemeteries are prone to white spot feather disease; orchards where peanuts are intercropped between rows of fruit trees are likely to cause the occurrence and spread of the disease.
Prevention and control technology
The same prevention and control technology as "Purple Feather Disease" .
