1. Symptoms: when the disease occurs, there will be long strip or oval light brown red spots on the leaves of the Korean pine. There is a green circle around the lesion, and then it expands into irregular large plaque, and black spots appear on the lesion.
2. Control methods: the diseased leaves should be removed immediately and destroyed in a centralized way. At the same time, 50% tobuzin should be sprayed to the diseased strains for treatment.
1. Symptoms: at the beginning of the disease, there will be small brown spots on the leaves, and then gradually expand into large round or oval spots. In the later stage, the disease spots gradually dried up, and the whole plant would be damaged if it was serious.
2. Prevention and control method: if it is kept indoors, windows shall be opened for ventilation to reduce the air humidity. It is necessary to spray the plants with thiophanate methyl, thiophanate methyl, Fumei anthrax and other chemicals to prevent the aggravation of the disease.
1. Symptoms: red spider is the main pest of Podocarpus. It will destroy the chlorophyll of the plant and fade the leaves. There will be dense yellow spots on the surface of the leaves, which will cause the leaves to turn yellow and wither gradually, and even fall off when it is serious.
2. Prevention and control method: when the disease occurs, 20% trichlorfon emulsion or 50% dichlorvos emulsion should be used to spray the disease plant for treatment to kill the pests.
