Primrose disease control

Primrose mosaic disease

symptom

The mosaic disease of primrose is a plant-wide disease caused by the mosaic virus, which can cause the leaves of the plant to become deformed or smaller, and is characterized by dark green stripes distributed throughout the plant. If affected by this type of disease, the infected plants will not bloom, and the flowers will be small and deformed. The virus is mainly spread by aphids, and the disease mainly infects the diseased plants of the surrounding weeds.

Prevention and treatment methods

First, remove weeds and diseased grass and destroy them in batches to reduce the source of infection. Secondly, eliminate aphids in time to prevent the spread of the virus.

Primrose brown spot

symptom

Primrose brown spot disease often occurs on Primrose and is caused by bacteria. Infected plants will have brown spots on their leaves. The virus from the diseased plants is spread to other plants through wind and rain.

Prevention and treatment methods

At the early stage of the disease, spray 70% of Benomyl for spraying and prevention.

Botrytis cinerea

symptom

Primrose gray mold is the most common disease of primroses and occurs throughout the country. When the plant is infected by the disease, it will turn yellow and shed its leaves. The disease mainly infects leaves and tender stems. It often occurs at leaf tips and leaf margins.

When the disease first occurs on the plant, water-like spots will appear, which will gradually grow larger to form brown spots and gradually rot. In the later stage, gray-yellow layers will be formed, which will gradually rot and fall off. If the climate is relatively humid, the disease is characterized by the appearance of a gray mold layer, which mostly occurs when the temperature is 20℃ and is most likely to occur when the air humidity is high.

Prevention and treatment methods

Planting should be done reasonably and the planting density should not be too close. Pay attention to keeping the environment well ventilated and reducing the humidity in the air. Cut off diseased leaves and dead branches in time to reduce the source of infection, so that the incidence rate will be reduced. During the outbreak period, spray 50% of cypermethrin for prevention and control.