Disease and Pest Control of Dendrobium officinale

1. Black spot disease

When black spot disease first occurs, there will be dark brown spots on the leaves with yellow surroundings, and then they will slowly spread to the entire leaf, and finally the leaves will wither and fall off. March to May every year is the peak period of this disease. You can spray Bordeaux mixture or Multi-Spirit liquid to prevent the disease and control its development.

2. Snail

Snails like to eat the leaves and stems of Dendrobium nigrofuranum, which is particularly harmful. They often eat the entire plant into a mess. Usually, you should pay attention to cleaning up dead branches and leaves to keep the place clean and hygienic. You can mix dichlorvos with bran and place it in places where snails often appear to poison and kill them. You can also directly spray dichlorvos and other pesticides or quicklime and salt water on the planting site.

3. Anthrax

Wind and rain can spread anthrax, and it usually invades through the wounds of Dendrobium nigrofusum, so the disease usually occurs when there is a lot of rain. In the early stage of the disease, small black round spots will grow on the stems and leaves of Dendrobium officinale. Gradually, pink sticky substances will appear on the small black spots, and finally the leaves will wither and fall off. Clean up fallen leaves and dead branches in time every winter to prevent pathogens from storing over the winter, and spray carbendazim or methyl thiophanate.

4. Soil pollution

March to May every year is also the outbreak period of sooty mold disease. As the name suggests, when this disease and pest occurs, all leaf surfaces will be covered with a layer of black powder like soot, affecting the photosynthesis of the leaves. Prevention and control measures: dilute carbendazim or malathion emulsion and spray.

5. Philippine shield scale

The Philippine shield scale is a common parasite. It often hides on the back or edge of the leaves of Dendrobium black hair and sucks leaf juice, causing the leaves of Dendrobium black hair to wither and fall off. If it is not controlled well, it will cause the Dendrobium black hair to wither and die, and it will also cause sooty mold disease. When the Philippine shield scale grows into shells but there are not many of them, you can cut off the branches and leaves that have been infected by the disease and insects and burn them together or simply pinch them to death. Late May is the hatching period of this insect. When the number of pests is large, you can spray dimethoate emulsifiable concentrate or lime sulfur mixture.