Pests and diseases of Huangli and their control methods

Common diseases and pests of Huangli

Diseases

Common diseases of Huangli include rust and leaf spot. When the disease occurs, rust or dark spots will appear on the leaves, affecting the appearance. When the spots are large, they will hinder photosynthesis and affect the growth of the plant. And if it's sick, how can it possibly raise a jelly-colored Huangli? In fact, these are all secondary. Once the Huangli is diseased, its ornamental value will be reduced and its growth will be inhibited. If no effective solution is found, the plant will slowly wilt and eventually die.

Pests

Common pests of Huangli are scale insects and root-knot nematodes. Scale insects mostly occur on the surface of leaves, sucking sap and affecting growth. In severe cases, leaves fall off and sooty disease is induced. Scale insects are prone to occur in high temperature and poorly ventilated environments.

Root-knot nematodes mainly appear in the soil and are difficult to detect in the early stages. When the leaves of the plant wilt and there are bumps on the soil surface accompanied by white colonies, it is necessary to remove the plant from the pot or irrigate the roots to kill the insects. The first thing root-knot nematodes harm is the roots, blocking the transport of nutrients between the roots and leaves, thus causing the death of the entire plant.

Prevention and control methods of diseases and insect pests of Huangli

Strengthen maintenance

Prevention is the main approach when it comes to diseases and insect pests. In the summer, when diseases and insect pests are most prevalent, pay attention to increasing ventilation, controlling watering, lowering humidity, and keeping the air dry.

Remove diseased leaves

Mild means that there are only a few spots or sparse insects on the leaves. At this time, you can scrape the insects off with a bamboo stick, or use tweezers to pinch out the insect body, but be careful not to damage the leaf surface, or combine pruning to cut off the diseased leaves.

Spraying

During the outbreak period, fungicides should be sprayed promptly, 1000 times diluted 40% oxydemeton-methyl emulsifiable concentrate, or 80-100 times diluted acaricide, spray once every 7 days, and spray continuously 2-3 times.

Alternatively, you can bury 15% iron chlorpyrifos granules in the pots, 1-2 grams per pot (15 cm diameter).