Citrus degenerative disease is a worldwide disease caused by the infection of Citrus tristeza virus. It is common in citrus production areas in China. Decay viruses harm citrus in three forms, sometimes referred to as rapid decay, stem depression, and yellowing disease.
Symptoms:
The main symptoms of rapid decline are the gradual or rapid decline or even death of citrus trees.
The main symptom of yellow seedlings is yellowing of the seedlings' leaves.
The main symptoms of stem depression are dwarfing plants, and the tree vigor is declining. The cortex of the shoots is peeled off, and the xylem has obvious depressions or traps. Sometimes it is filled with glue, and the branches are easily fragile and the leaves show yellowing of the main veins. The Fruit becomes smaller.
Incidence rule:
Degenerative diseases are transmitted through infected seedlings grafted materials or aphids. The virus-infected aphids include orange aphid, cotton aphid, and orange bifurcation. After the virus invades the host, it generally runs from the top down, destroys the phloem of the rootstock, hinders the nutrient delivery, causes the roots to rot, and causes the disease in the underground. Seeds, juice, and soil are not transmitted.
Prevention:
1. Strengthen plant quarantine and control the introduction of strong strains that can cause severe stemming points in Sweet oranges.
2. For the severe disease, the diseased tree should be eradicated. It is recommended to update the tree species with strong disease resistance as the main species.
3, for the incidence of light shoots, should be promptly trimmed and trimmed in the wound healing anti-corrosion film to promote wound healing.
4. Prevent and control poisonous insects. The main pesticides for controlling locusts in the field are anti-influenza, cypermethrin or chlorhexidine, chlorbenzolid, and aqueous aminosulfide solution. It is recommended to add a new high-fat membrane to enhance the efficacy.
5, prevention and protection can not ignore the protection. In the flowering period and young fruit after spraying strong fruit to increase the coarse fruit pedicle, increase the amount of nutrient delivery. Strengthen the tree body and increase the ability of the tree to fight infections. Appropriately increase fertilization before and after fruit harvesting to increase tree vigor. In areas with low temperatures in winter, general tree-brushing and tree protection generals do cold work.
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