Common diseases of Dendrobium officinale: black spot diseaseSymptoms of black spot disease of Dendrobium safflowerWhen the disease occurs, dark brown spots appear on young leaves, with yellow surrounding the spots, which gradually spread to the leaves. In severe cases, the black spots connect to each other on the leaves, and finally wither and fall off. This disease often occurs in early summer. Prevention and control methods of black spot disease of Dendrobium officinaleIf the symptoms are severe, the diseased leaves can be manually cut off. Chemical control: Use 1:1:150 Bordeaux mixture or 1000 times solution of Dolin to prevent and control its development. Common diseases of Dendrobium officinale: AnthracnoseSymptoms of Anthracnose in Dendrobium officinaleIt harms leaves, stems and branches, and brown or black spots appear on the affected leaves. It occurs from January to May. Prevention and control methods of anthracnose of Dendrobium officinaleSpray 1000 times diluted 50% carbendazim or 1000 times diluted 50% thiophanate-methyl for 2-3 times. Common diseases of Dendrobium officinale: Sooty moldSymptoms of Dendrobium officinale sooty diseaseWhen the disease occurs, the entire surface of the plant's leaves is covered with a layer of soot-black powder, which seriously affects the photosynthesis of the leaves and causes plant stunting. March to May is the main outbreak period of this disease. Prevention and control methods of Dendrobium officinale sooty diseaseSpray 1000 times diluted 50% carbendazim or 1500 times diluted 40% dimethoate emulsion 1-2 times for prevention and control. The domesticated Dendrobium requires a good ventilation environment and good drainage performance of the pot soil. Always pay attention to maintaining the air humidity, otherwise it is easy for the Dendrobium to develop these nasty diseases. |
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