Common diseases and pests of mirror grass and their prevention and control methods

Common diseases of mirror grass and their prevention and control methods

anthrax

Anthracnose is an important disease that harms foliage flowers and is a fungal disease. It often occurs in hot and humid seasons, especially the hot and humid rainy season, and can also be caused by excessive application of nitrogen fertilizer.

Symptoms: Small brown spots appear on the leaves at the early stage of the disease, which then expand into round or oval shapes. The spots gradually dry up, and in severe cases the entire plant is infected.
Prevention and control methods: First, open the windows for ventilation to reduce indoor air temperature and humidity. Then spray with 1000 times diluted 70% methyl thiophanate wettable powder, or spray 70% methyl thiophanate 60% anthrax, fumei, multi-bacterium, etc. to prevent the disease from spreading further.

Leaf spot

Symptoms of leaf spot disease: The pathogen infects the leaves, and the spots on the leaves are circular, which later expand into large irregular spots and produce ring patterns. The spots change from reddish brown to dark brown, with gray-brown in the center.

Prevention and control methods: Remove diseased leaves and add pesticides for prevention and control.

Clear the diseased leaf parts promptly and spray the pesticide. The pesticide can be 1000 times diluted 50% thiophanate.

Common Pests of Mirror Grass and Their Control Methods

Scale insects

Basic symptoms of scale insect pests: Scale insects attach to the surface of mirror grass leaves, and their secretions contaminate the leaves, even causing serious consequences such as leaf withering.

Causes of scale insect occurrence: untimely disinfection and breeding of insect eggs.

Prevention and control methods: Spray the pesticide in time during the nymph stage. You can use 1000 times diluted 40% oxydemeton-methyl, spray once every 8 days, for 2 to 3 times in a row. Mixing white wine with water can also effectively kill scale insects without damaging the leaves of mirror grass.

Cotton scale

Symptoms of the cottony scale: They often gather on leaf buds, tender buds, and new shoots to cause damage. In severe cases, the leaves turn yellow, causing the branches to wither, and eventually the entire branch or plant to die. Even if some branches and leaves remain, they will become gray and black due to sooty mold caused by their excrement, seriously affecting their ornamental value.

Prevention and control methods: Check at any time, pinch out the female insects and egg sacs with your hands or tweezers, or cut off the insect branches and leaves.

During the migration period of newly hatched nymphs, you can spray 1000 times diluted 40% oxydemeton-methyl, 1000 times diluted 50% fenitrothion, or 400-600 times diluted ordinary laundry detergent, once every 2 weeks or so, and spray 3-4 times in a row.