Why are there black spots on the leaves of plants?

Why there are black spots on the leaves of plants: This is a fungal disease, belonging to plant anthracnose.

1. Cause analysis:

Anthrax is a disease caused by anthrax and a common plant disease. Almost all plant leaves are likely to get sick, especially in rainy season and typhoon season. There are also some lurking on some healthy leaves. Once the environment is hot and humid, or plants are aging and rotting, these germs will start to break out, and plants will easily get sick.

2. What are the characteristics of black spots?

In the early stage of plant disease, the leaves will grow into needle-like faded spots, which will gradually become larger, the color of the spots will become darker, brown and finally black. Of course, the shape of spots on plant leaves will be different.

The changes of these lesions will change with the health status of plants. Some spots are round while others are irregular. When the condition is the most serious, small lesions begin to gather and become patches. When the disease is the most serious, the whole leaf dries, and finally holes appear and the leaves fall off.

3. Methods of disease control:

Pay attention to keep the environment ventilated and transparent to avoid high temperature and humidity and water accumulation in basin soil.

When you see diseased branches and leaves, you should prune them in time to keep the plants strong and improve the disease resistance.

Plants can be controlled by spraying drugs after onset, and can be controlled at an early stage. Thiophanate methyl, carbendazim, carbofuran and anthrax can be used interchangeably.