Control methods of Root Rot of Dendrobium

Dendrobium root rot, also known as nematode disease, nematodes parasitic on the root of Dendrobium, causing root rot, poor growth of aboveground leaves, leaf color faded, yellowing, and even caused plant wilting. Nematode damage caused a large number of wounds, but also caused the infection of other soil-borne bacteria, resulting in plant disease and accelerated plant death.

Etiology of root rot of Dendrobium

Nematodes generally overwinter as eggs, larvae and adults in diseased and residual tissues or cultural substrates. Generally, it is infected by contact with infected soil, irrigation water and human operation, and the damage caused by wound invasion caused by plant transplantation in early spring is more serious when it is hot and humid.

The root rot of Dendrobium mostly occurs in the cultivation bed with moss as the cultivation substrate. Nematodes exist in the dry moss plants in a dormant state. After watering, the bryophytes absorb water and swell, and the nematodes change from dormancy to active state, and then harm Dendrobium. The damaged plants, stems and leaves form white curved lines, and nematodes can be seen clearly under the microscope, which is harmful to Dendrobium.

Symptoms of root rot of Dendrobium

If the leaves of mature Dendrobium plants lose color, have cyan wrinkles, or the leaf tips are scorched, or the new buds are delayed, and the growth is abnormally slow, root rot may occur. If it is found that there are annular or long circular brown spots on the rhizome, root tip or other parts during the examination, there are obvious signs of water-filled rot on the spots, and there are white or brown attachments, you can be sure to suffer from Dendrobium root rot. If you squeeze the brown spot hard, you can be sure to have the disease. It will spill water.

Control methods of Root Rot of Dendrobium

Since most germicidal pesticides can only be transported upward, not two-way transport, the effect of spraying on root rot is not good, and the method of root watering must be adopted to be effective. The commonly used method is to irrigate the root with 600x solution of Dikesong or 600x solution of Fenru Ling, and other agents can also irrigate the root with the solution of 600x of 70% carbendazim and 1000 times of "Lubang 98".

1. When selecting bark and bryophytes as substrate, it must be soaked in water for 1 week and then used.

2. For wild seedlings, bryophytes on stems and roots should be carefully removed and destroyed by fire.

3. Apply nematicidal agents: such as aldicarb, C-line phosphorus, kexidan, etc., the dosage shall be applied according to the instructions.