How to prevent and treat common diseases of chrysanthemum

Black spot

symptom

As long as the disease harms the leaves, the main manifestation is the appearance of dark brown spots on the leaves.

Prevention and treatment methods

Remove any sick leaves immediately

For chrysanthemums in the fields, you can change the crops you plant once a year, and for chrysanthemums in pots, you can just replace the soil every year.

After cutting the dead branches in the ground in winter, burn them in one go or bury them by deep plowing the soil.

powdery mildew

symptom

The disease is mainly characterized by the appearance of white powdery substances in the diseased areas, which in most cases appear on leaves and petioles, and sometimes also in other parts of the body.

Prevention and treatment methods

Quickly clean up diseased leaves and diseased debris, gather them together and burn them.

Watering should be done in a ventilated manner, lower the humidity, and use fertilizers reasonably.

Stem rot

symptom

The seedlings are easily infected by this disease. The bottom of the diseased seedlings is watery at first, and then slowly turns brown, causing the death of the seedlings. When adult plants are infected with this disease, the leaves, buds and flowers slowly wilt.

Prevention and treatment methods

Avoid exposure to the sun during the seedling stage, water appropriately, and drain excess water quickly after rain.

Master the cultivation density, use fertilizers reasonably, and use nitrogen fertilizers in moderation.

Do not let the seedlings get hurt during maintenance.

If you see diseased plants, pull them out and burn them immediately.

Mosaic

symptom

Diseased leaves have unevenly distributed necrotic spots of varying sizes. Severe cases may appear as brown spots, which can cause the entire leaf to necrotize and fall off.

Prevention and treatment methods

Do not use diseased chrysanthemums as breeding materials to fundamentally eliminate the disease.

After the cultivation material is selected, a heat treatment process must be carried out.

Disinfect commonly used tools to reduce damage to chrysanthemums and remove weeds and other parasites.

Strengthen pest control to prevent the spread of this disease.

If you see diseased plants, pull them out and burn them.

Others are too concentrated, ventilation and light transmission should be good, to cultivate strong seedlings and improve the disease resistance of chrysanthemums.