What causes yellowing leaves in flowers and what are the main pests and diseases?
Today the consumption of floral products has become a fashion, and flower bonsai and potted flowers remain the mainstream of floral products, but many people have had this experience: a perfectly healthy flower, as it is being grown, turns yellow in the leaves. So what causes yellowing leaves in flowers? And what are the main pests and diseases?
I. What causes yellowing leaves in flowers?
1. Too much watering
Generally, too much watering causes the tender new leaves at the top of the flower to turn light yellow, while the old leaves yellow and wither, because overwatering creates standing water in the pot, the soil becomes oxygen-deprived, and the roots rot. When watering flowers normally, do not pour a lot at once; try to go gradually.
2. Soil too dry
If the soil is not watered for too long and becomes too dry, the leaves at the bottom of the flower age and show symptoms of drying up.
3. Lack of fertilizer
If the leaves of the flower are found to be very thin and yellowing over a large area, it is very likely caused by insufficient fertilizer.
4. Too much fertilizer
In addition, if too much fertilizer is applied, it leads to excess nutrients and fertilizer burn; generally the newly grown leaves become very thick, while the old leaves gradually turn yellow.
5. Unsuitable light
Some flowers like light and some like shade. If you have not figured out the growth habits of the flower you are growing, yellowing leaves caused by unsuitable light can easily occur.
II. What are the main pests and diseases of flowers?
In fact, besides the above care-related factors, yellowing leaves can also appear when flowers suffer from pests and diseases.
1. Flower pests and diseases
Black spot, anthracnose, leaf spot, soft rot, phytophthora rot, leafminer, thrips, aphids and whiteflies, etc.
2. Factors that cause pests and diseases in flowers
(1) Soil problems
Soil is a very important condition in the process of growing southern flowers, and it is also a place where fungi and insect pests breed.
(2) Environmental problems
The growth of flowers requires suitable temperature and humidity, but this is not only beneficial to the growth of flowers, it is also beneficial to the development of pests and diseases. In such an environment, dew often forms on the surface of flowers, which to a certain extent leads to soft rot and phytophthora rot in flowers.
(3) Plant characteristics
Different varieties have different growth characteristics, and the southern environment easily leads to disease in flowers and plants. For example, with Phalaenopsis and Chinese fan palm, yellowing leaves appear when they are exposed to relatively strong sunlight.
Overall, the principle of "prevention is more important than treatment" should be upheld for flower pests and diseases. When planting flowers, try to choose loose soil with strong drainage and ventilation capacity and good light transmission, so that flower pests and diseases cannot survive under such conditions.