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Dendrobium candidum is mainly distributed in Anhui, Zhejiang, Fujian and other places in China. Its stem is used as medicine, and it is a yin medicine in the tonic medicine. The root rot of Dendrobium candidum is also known as nematode disease. The nematode is parasitic on the root of Dendrobium candidum, causing the roots to decay. The leaves on the ground are poorly grown, the leaves are green, yellow, and even the plants are wilting. Nematode damage constitutes many wounds, and also causes infection by other soil-borne bacteria, causing the disease to occur and accelerating plant death.
The cause of root rot of Dendrobium candidum
Nematodes generally overwinter in eggs, larvae and adults in diseased arrangements or culture media. Generally, it is infected by insect-bearing soil, irrigation water and human operation. In the early spring, the wounds invaded from the plant transplants, and the disease is more serious when the temperature is high and the humidity is high.
The root rot of Dendrobium candidum is often in the culture bed with moss as the culture medium. The nematodes exist in the dry bryophytes in the dormant state. After the watering, the bryophytes grow up and the nematodes change from dormancy to activity, and thus damage. Dendrobium candidum, the damaged plants, stems and leaves constitute a white meandering line, under the microscope can clearly see the nematodes, damage to Dendrobium candidum.
Symptoms of Dendrobium candidum root rot
If the leaves of mature Dendrobium candidum are lost, there is a blue stagnation, or the leaves are scorched, or the sprouts are delayed, and the growth is abnormally slow. There is a possibility of root rot. If you find roots, root tips or other parts when you look at it, if you find roots, root tips or other parts. It has a ring-shaped or long-ringed brown spot with obvious water-filled and decaying marks on the spot, and it has a white or brown attachment. It can be confirmed that it has a root rot of Dendrobium candidum. If it is hard to knead the brown spot, it will splash. Come out of the water.
Prevention and treatment of Dendrobium candidum root rot
Since most bactericidal pesticides can only be transported upwards and do not have bidirectional transport, it is necessary to use the method of spraying to prevent root rot, and it is necessary to use the rooting method. The commonly used method is 600 times of the ceke pine. Or powder rust (yun Dapu Ling) 600 times liquid rooting, other agents can also use 70% cardamox 600 times liquid and "Lvbang 98" 1000 times liquid rooting.
1. When using bark and bryophytes as substrates, it is necessary to use them after soaking for 1 week.
2. For wild seedlings, stems and root bryophytes should be carefully removed and burned with fire.
3. Application of nematicidal agents: such as nourishing, propylphosphonate, ketone, etc., the application amount is applied according to the instructions.
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