Why do yellow spots appear on the leaves of plants?

If the soil is too wet and poorly ventilated, which is generally leaf spot, spray "carbendazim" for treatment. ?

Leaves with yellow spots may also have leaf spot disease, which belongs to fungal diseases. Some fungicides can be used to deal with this disease. Plants can be sprayed with broad-spectrum fungicides such as azoxystrobin and mancozeb.

Before spraying, the whole plant should be pruned, the diseased leaves should be cut off, and the branches with serious leaves, inner branches and too dense branches should be cut off. One thing to pay attention to is to strengthen ventilation (I wonder if the leaves are sprayed with water or something). Too dense branches, insufficient ventilation and too wet soil will all cause leaf spot. Flowers with conditions in autumn can be temporarily moved to outdoor cultivation, and then moved indoors for wintering when the temperature is lower than 15 degrees.

It may also be sunburn, or hot and cold (turn on the air conditioner), or splash cold water at noon. At this time, cut off the damaged leaves without spraying.

Leaves are the vegetative organs of higher plants, and their lateral causes develop from the leaf primordium of plant stems. Leaves contain chloroplasts, which are the main organs of photosynthesis in plants. At the same time, the transpiration of plants is also realized through the stomata of leaves. Leaves can have various shapes, sizes, colors and textures.

Leaves only appear on real stems, that is, only vascular plants have leaves. All higher plants such as ferns, gymnosperms and angiosperms have leaves. In contrast, mosses, algae, fungi and lichens have no leaves. Only leaf-like structures can be found in these bacteria, but they can only be used as Analoga.

Leaves can have various shapes, sizes, colors and textures. The petiole supports the leaves and connects them with the stems. Stipules protect young leaves.

reference data

Baidu encyclopedia-leaves