Diseases and prevention methods of hibiscus chandelier

Diseases of Chandelure Hibiscus: Leaf Spot

symptom

Leaf spot is a true chrysanthemum disease that often occurs in late autumn when the weather turns cold, especially in northern regions where warmth is not kept in place.

The initial symptom is the appearance of light yellow or reddish-yellow spots on the leaves. The spots gradually expand and become round or oval. If the environment is relatively humid, black particles will appear on the spots, which are the conidia of the pathogen.

In the later stages, the disease worsens and the leaves gradually dry up until they fall off.

Prevention and treatment methods

The best way to prevent and control leaf spot disease is to do a good job of cold prevention. When the wind blows hard and the temperature drops in autumn, take protective measures for the chandelier hibiscus, place it in a place with higher ambient temperature, and maintain a certain temperature.

On the basis of keeping warm, timely spraying of 500-800 times diluted mancozeb or 1500 times % ammonium can also have a good preventive effect.

Diseases of Chandelure Hibiscus: Stem Rot

symptom

Stem rot is a serious fungal disease with a wide range of occurrence. It often occurs in the rainy season and is more serious under high temperature and heavy rain conditions.

The pathogen will infect the chandelier hibiscus from the root and stem junction. The initial symptoms are not obvious. The cortex of the affected area is wrinkled and slightly dark brown, but the subcutaneous tissue has actually begun to rot.

Afterwards, the yellow-brown spots gradually expand inward, the leaves dry up and fall off, and after the spots circle the stem, the plant will dry up and die.

Prevention and treatment methods

The key to preventing stem rot is to prevent heavy rain from eroding the chandelier hibiscus for a long time, and to apply 200-500 times of thiophanate-methyl liquid to the branches and trunk of the chandelier hibiscus every 10 days or so before and after the rainy season.

Diseases of Chandelure Hibiscus: Root-knot nematode disease

symptom

Root-knot nematode disease mainly occurs in the branches and leaves of the chandelier hibiscus. In the early stage, the leaf growth is weak, and reddish-brown dead spots appear on the edges of the leaves. In the later stage, the spots gradually expand inward, and the leaves dry up and fall off.

If you observe the underground part of the chandelier hibiscus, you will find large and small tumors between the roots of the plant. They are smooth and flesh-colored at first, and rough and brown in the later stage. They contain pear-shaped female nematodes the size of a needle tip.

Prevention and treatment methods

This disease is difficult to prevent and treat. If the number of plants is small, the soil should be changed. The believers should expose the plants to the sun for a long time, and the old soil can be discarded.

If there are many plants, you can apply aldicarb granules, about 0.5 grams per 5-inch pot.