Peony white feather disease prevention and treatment

White feather disease is widely publicized in our country. It is responsible for many kinds of flowers and plants. The host counts 26 families and 40 kinds of plants. After getting infected, the tree vigor gradually weakens and it dies. Early detection of nuclear diseases is easy to control.

symptom

The roots were killed. At the beginning, the mildew was reported and later extended to the lateral and main roots. The disease is very tangled with a white or off-white silky net, the rhizome. The soft tissues reported by the late molds disappeared, and the outer cork layer sheathed the outside of the xylem. Sometimes there are black round sclerotia in the root of the disease. "The upper part of the ground above the rhizosphere appears gray or white.

A gray-brown, thin velvet cloth, which is a mycelium film, and sometimes forms a small black spot, that is, the hand capsule shell of the pathogen. At this time, the plant's ground gradually weakened and died.

pathogen

The germs are brown and aseptic [Rosellinianecatrix (Hart.) Berl.], which belongs to the phylum Streptomyces subcochlea. The asexual period is DematoPhoranecatrix imperfect fungi. One end of the section of old mycelium grows and then separates to form a round larval spore. Follicular bracts and conidia are formed in the asexual period and are often produced after the host is completely rotted. Sclerotia are formed in decaying xylem, black, nearly round, about 1 mm in diameter, up to 5 mm.

Infection route

Germs, mycelia, or mycorrhizal or bacterial colonies overwinter in the soil as the disease remains. When the environmental conditions are appropriate, the seedlings or roots grow vegetative mycelium from the cords, first infringing on the soft tissue of the new roots, and the damaged fine roots are softened, decayed, and disappear until they gradually extend to the thick roots. In addition, diseased roots can also be transmitted through contact with each other. Long-distance transmission of disease, through the transfer of diseased seedlings. Germs can invade a wide variety of trees.

Control methods

1. When selecting disease-free nursery stocks for seedling raising and transport, strict inspections should be conducted to eliminate diseases, and when the establishment of the park is completed, there should be no disease and strong mountains. If it is considered that the seedlings are infected, they can be sown with a 10% copper sulphate solution, or 20% lime water, and 70% thiophanate-methyl 500-fold solution for 1 hour before planting. It is also possible to use a 47°C warm water immersion bond for 40 minutes or a 45°C warm water immersion for 1 hour to kill the hyphae of the seedling roots.

2. People digging trenches in the diseased parts or outside the ward to dig more than 1 meter deep trenches to block, to prevent disease spread to expand around.

3, diseased tree treatment and removal of diseased forest with white peony disease.

4. Strengthen management to eliminate water; reasonable fertilization, nitrogen, phosphorus, and potassium fertilizers should be applied in appropriate proportions, and in particular, attention should be paid to the application of nitrogen fertilizer and appropriate application of potassium fertilizer; reasonable pruning should be used to strengthen the control of other diseases and pests.

5, nursery Rotary disease nursery should be casual or with wooden undergraduate crop rotation, 5 to 6 years before continuing to nursery.

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