Metasequoia is an important street tree species in landscaping and has excellent economic and ornamental value. But in the growth process of Metasequoia if you encounter disease and insect pest hazards will greatly affect its normal growth, this issue and Xiaobian together to see the common diseases and insect hazards and control methods of Metasequoia, to prevent problems before it happens!
【1】Metasequoia rust:
Symptoms: Metasequoia rust disease in the spring, after the onset of the disease can be seen on the back of the leaf and petiole, leaf veins will be observed yellow-brown powdery summer spores, fungal invasion of the plant will make the branches and leaves lose green and yellow, the surface of the spot has a raised spore pile, in severe cases, will cause the whole plant leaves to wither and fall off and buds dry off.
Prevention and control methods:
1. Prune diligently and remove rusty branches and leaves in time;
2. Rational application of nitrogen, phosphorus and potassium fertilizers to prevent growth and enhance the disease resistance of plants;
3. Pay attention to ventilation and light transmission, do a good job of drainage, reduce the temperature, and create a suitable growth environment for the plant.
4. Before or initial rust occurs, you can use a bottle of Qilin Tianjun mixed with water 150 kg to cooperate with plant strong spray prevention.
【2】Rose leaf bee:
Hazard characteristics: Rose leaf wasps can occur in 2 generations per year, and the larvae generally overwinter in the soil cocoon. Rose leaf wasps have a cluster habit and in severe cases can eat up their leaves, leaving only the veins. The female lays eggs on the branches, which can kill the branches.
Prevention and control methods: Qilin Guangzheng spray can be used to control leaf bee hazards.
【3】Leafhopper:
Hazard characteristics: Leafhoppers can occur for 5-6 generations in 1 year. The sap is sucked by a suction mouthpiece, so that the leaves appear pale white spots, and when the damage is severe, the spots will spread into patches, causing the branches and leaves to wither.
1. Remove the nursery in time in winter to reduce the source of insects overwintering;
2. You can use Qilin Guangzheng for spray prevention.
【4】Metasequoia Red Spider:
Hazard characteristics: The red spider sucks the juice of Metasequoia with a sucking mouthpiece, so that the affected needle leaves lose green and appear gray-yellow spots, causing scorching and early leaf fall.
Control method: Before the occurrence of pests or when the harm is occurring, use Qilin drip to control with the help of infusion bags, the effective period can reach 3-6 months, or use Qilin Shaobao spray control.
