What is the reason why the leaves of flowers turn yellow? What are the main diseases and insect pests?

Nowadays, the consumption of flower products has become fashionable, and bonsai and potted flowers are still the mainstream of flower products, but many people have such an experience that flowers turn yellow with leaves, so what is the reason for the yellowing of flower leaves? What are the main diseases and insect pests.

First, what is the reason for the yellowing of flower leaves.

1. Too much water

In general, too much water will cause the young leaves on the top of the flowers to show light yellow, the old leaves yellow and wither, because too much water will produce stagnant water in the flowerpot, the soil will lack oxygen, and the roots will rot. Don't water the flowers all at once, try to come.

The soil is too dry

If the soil is too dry without watering for too long, the leaves at the bottom of the flowers will age and the symptoms of dry springs will appear.

3. Lack of fat

If the leaves of flowers are found to be very thin and yellowed on a large scale, it is likely to be caused by a lack of fertilizer.

4. Much fatter

In addition, if you apply too much fertilizer, it will lead to overnutrition. Generally speaking, the new leaves will become very thick, and the old leaves will slowly turn yellow.

5. Light discomfort

Some flowers like light, some flowers like shade, if you do not understand the growth habits of their own flowers, it is easy to produce leaf yellow due to discomfort of light.

Second, what are the main diseases and insect pests of flowers.

In fact, in addition to the above conservation factors, the symptoms of yellowing of leaves may also occur when there are diseases and insect pests in flowers.

1. Flower diseases and insect pests

Black spot, anthrax, leaf spot, soft rot, Phytophthora, Liriomyza huidobrensis, thrips, aphids and whitefly.

2. Factors affecting the occurrence of diseases and insect pests in flowers.

(1) soil problems

Soil is a very important condition in the process of flower cultivation in the south, and it is also a place where germs and insect pests are breed.

(2) Environmental problems

The growth of flowers needs appropriate temperature and humidity, but this is not only conducive to the growth of flowers, but also conducive to the development of diseases and insect pests. In such an environment, the surface of flowers is often accompanied by dew, which to a certain extent leads to soft rot and Phytophthora.

(3) Plant characteristics.

Different varieties have different growth characteristics, and the environment in the south can easily lead to diseases of flowers and plants. For example, Phalaenopsis and Phalaenopsis have yellowing leaves when exposed to intense sunlight.

Generally speaking, flower diseases and insect pests should adhere to the principle of "prevention is more important than control". When planting flowers, try to choose some loose soil, strong drainage and ventilation capacity, and have good light transmittance, so that flower diseases and insect pests can not survive under such conditions.