1. Diseases caused by improper management of root rot or stem and leaf rot, followed by leaf shrinkage, dark spots, and then the whole plant shrinks. This is because the humidity is too high, the temperature is too high, and poor ventilation or seedling density is caused. Can be sprayed with fungicides such as bacillus bacillus or carbendazim (800 to 1000 times solution). But do not spray it frequently!
The sudden drop of leaves in the short term is often due to a large temperature change or insufficient lighting.
The leaves turned yellow and soon fell off, most of which was caused by insufficient watering. This phenomenon can also occur in winter when the temperature is too low.
The tip of the leaf or the edge of the leaf blade is charred, sometimes due to excessive light or air drying. Sometimes it is caused by excessive fertilization or drying of potted soil.
Branches and leaves are long, mainly due to insufficient lighting, too much nitrogen fertilizer, improper irrigation, should be transferred to light, pruning branches.
There are yellow spots or brown spots on the leaves that resemble water spots, which may be the result of excessive watering, muddy spots flying to the leaves.
2, the soil is too alkaline to cause disease, short stature, slow growth, easy yellow leaves. In particular, leaves without cause eventually cause premature death and premature death. Or caused by water containing high alkali content. Saline is easy to accumulate on the surface of potted soil. If you regularly remove the topsoil and add new soil, it will reduce the alkalinity. Therefore, it is necessary to change soil. Apply a small amount of 0.2% dilution of ferrous sulfate regularly to improve the alkalinity of the soil!
3. The physical diseases caused by drought, such as dehydration and leaf wilting, should put a pot of water under the pot to make it slowly absorb water, but it is also not possible to water too much at once.
4. Symptoms of viral disease: The virus is generally invisible to the naked eye. It is a tiny, granular body composed of nucleic acids and proteins that can only be observed with an electron microscope. Parasitic in the plant living tissue, living cells, organic substances with the host, spread to the body of the host, interfere with the host's metabolism, resulting in various symptoms. Therefore, in the case of rapid propagation, the material should be taken from plants that are strong and disease-free.
5, pest control
(1) The soil pest is a general term for scarabs and insects. Adults call gold turtles or scarabs milky white and bend into a "C" shape. Graze the plant roots and allow them to wither. From May to June, it stays in the night and damages the leaves. The prevention and control method is to pay attention to picking up and eradicating when plowing or on the basin. Can be used 50% phoxim EC 1000 to 1500 times liquid irrigation rhizosphere (50 to 100 ml per plant.
(2) Dark brown or brownish brown, which will cause criss-cross tunnels in the water, causing uplift of the floating soil, as well as the separation of the root from the soil, and the plants will dehydrate and wither. And like to bite the roots, the spring and fall season is serious, the prevention and control method is: manual elimination. It is also possible to mix wheat bran with 90% trichlorfon 30 times and sprinkle it at the base of the seedlings in the evening. Or use 50% phoxim EC 1000 to 1500 times solution to water the rhizosphere.
(3) Small tigers commonly known as silkworms, gray-brown, 16-23 mm, lurking in the surface of the soil during the day, unearthed at night, bite the root! April is more serious! Can be extinguished manually, or with 50% phoxim EC 1000 to 1500 times the liquid poured root.
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