What are the causes of yellowing leaves in flowers and what are the main pests and diseases?
Today the consumption of flower products has become fashionable, and flower bonsai and potted flowers remain the mainstream of flower products, but many people have had this experience: a perfectly good flower, as it is being grown, develops yellow leaves. So what causes yellowing leaves in flowers? What are the main pests and diseases?
1. What causes yellowing leaves in flowers?
1. Too much watering
Generally, too much watering causes the young leaves at the top of the flower to turn pale yellow, while the old leaves yellow and wither, because overwatering creates standing water in the pot, the soil becomes oxygen-deficient, and the roots rot. When watering flowers normally, do not pour a lot at once; try it 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 and yellowing.
3. Lack of fertilizer
If you find that the flower's leaves are 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 causes nutrient excess 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, yellow leaves caused by unsuitable light are very likely to occur.
2. What are the main pests and diseases of flowers?
In fact, besides the care-related factors above, 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 blight, leafminer, thrips, aphids and whiteflies, etc.
2. Factors affecting the occurrence of 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 pests breed.
(2) Environmental problems
The growth of flowers requires suitable temperature and humidity, but this not only favors the growth of flowers, it also favors the development of pests and diseases. In such an environment, dew often forms on the surface of the flowers, which to a certain extent leads to soft rot and phytophthora blight in flowers.
(3) Plant characteristics
Different varieties have different growth characteristics, and the southern environment easily causes disease in flowers and plants. For example: Phalaenopsis orchids and Chinese fan palms (Livistona chinensis) show yellowing leaves when exposed to relatively strong sunlight.
Overall, for flower pests and diseases, the principle of “prevention is more important than treatment” should be upheld. When planting flowers, choose loose soil with strong drainage and ventilation and good light transmission as far as possible, so that flower pests and diseases cannot survive under such conditions.