Control of common diseases and insect pests of Metasequoia

Metasequoia rust and its control

Metasequoia rust disease occurs in spring. After the disease occurs, yellow-brown powdery summer spores can be observed on the back of leaves, petioles, and veins. When the fungus invades the plant, it will cause the branches and leaves to lose their green color and turn yellow. There will be raised spore piles on the surface of the lesions. In severe cases, it will cause all the leaves of the plant to wither and fall off, and the flower buds to shrivel and fall off.

Methods for controlling Metasequoia rust

Prune frequently and remove rusty branches and leaves in time; apply nitrogen, phosphorus and potassium fertilizers reasonably to prevent excessive growth and enhance the disease resistance of the plants; pay attention to ventilation and light transmission, do a good job of drainage, lower the temperature, and create a suitable growth environment for the plants.

Metasequoia - coffee borer and its control

The larvae of the coffee borer bore into the stems of Metasequoia, eating away at the vascular bundles in the stems, causing the branches to die and making it impossible for the plant to grow and bloom normally. In severe cases, the stems can be hollowed out and broken.

Control methods of metasequoia - coffee borer

If there are not many insects, cut off the affected young branches and burn the dead branches in a concentrated area; if the insects break out over a large area, you should consider using chemical pesticides. You can inject a 200- fold diluted omethoate solution into the insect holes to kill the larvae.

Metasequoia - Rose Sawfly and Its Control

Rose sawfly can produce two generations a year , and the larvae usually overwinter in cocoons in the soil. Rose sawflies have a habit of gathering in groups. In severe cases, they can eat all the leaves, leaving only the veins. The female insect lays eggs on the branches, which can cause the branches to die.

Control methods of Metasequoia - Rose Sawfly

Manually remove branches with hatched larvae with leaves attached; spray with 1000 times diluted trichlorfon solution or 2000 times diluted cypermethrin solution.

Metasequoia - Leafhopper and Its Control

The reproduction cycle of leaf cicada is short, and 5 to 6 generations can occur in a year . Leafhoppers use their mouth needles to suck sap, causing pale white spots to appear on the leaves. When the damage is serious, the spots will spread into patches, causing the branches and leaves to wither.

Metasequoia - Leafhopper Control Methods

Clear the nursery promptly in winter to reduce the source of overwintering insects; if conditions permit, use black lamp rust to kill adult insects.