Disease and Pest Control of Meiguanlan

Scaly mushroom

They usually appear on the surface of leaves, and some small bags may grow on branches, containing orange, rust or black dot-shaped spores. Having this rust disease is not a serious problem and the leaves will not wither, but it will cause the plant to become weak and affect its growth.

Prevention and control methods: First, you can directly cut off the diseased leaves, and second, you can spray with 500-600 times diluted 65% Zineb powder or copper-containing fungicide.

Sclerotium rolfsii

White rot is prone to occur during the rainy season. In the early stage of the disease, many white filaments will appear on the leaves. These hyphae will gradually cause serious rot of the rhizomes.

Prevention and control methods: Replace all the contaminated potting soil, and then sprinkle pentachloronitrobenzene powder or lime. This method can temporarily cure white rot, but if you want to fundamentally prevent the occurrence of white rot, you still need to pay attention to ventilation and drainage to create a good growth environment for the beautiful crown orchid.

anthrax

Anthrax is also relatively common. There is no fixed season for the disease to occur. It is more likely to occur and more serious when the weather is hot and humid. In the early stage of the disease, earthy brown spots will appear on the leaves, and then the spots will gradually increase and expand, and small black dots will appear, gradually spreading from the tip of the leaves to the branches. In severe cases, it will directly cause the death of the plant.

Prevention and control methods: To treat this disease, you can use methyl thiophanate wettable powder to spray the diseased branches and leaves once a week or so; then use Bordeaux mixture for auxiliary spraying, once every half a month, and three to five times will gradually improve.

Scale insects

Scale insects often gather in groups on the branches and leaves of plants to suck sap, causing the branches and leaves to wither and die, and in severe cases, the plants may die. This insect grows fastest and reproduces in large numbers in a humid, high-temperature, and poorly ventilated environment, which is very detrimental to the health of the plant.

Prevention and control methods: Spray the branches and leaves with omethoate or malathion to kill insects. If the number of insects is small, you can also manually remove the insects.