Methods for the Control and Prevention of Flower Fungal Leaf Spot Disease
Today, the editor will explain the content related to flower clinics, specifically the methods for the control and prevention of flower fungal leaf spot disease. Next, let's introduce the details.
The leaf spot fungus overwinters in diseased residues or on the soil surface, and in the following year, it is spread and infects the host through wind and rain. The leaf spot disease in Celosia, especially during the summer and autumn months (August-September), is severe. The leaf spot disease in Caryota is severe during the high-temperature summer months, while the leaf spot disease in Clivia occurs in spring and autumn, but it can occur all year round in greenhouses. Continuous cropping, excessive dense planting, poor ventilation, and high humidity all favor the occurrence of the disease.
Symptoms:
① Celosia leaf spot disease infects leaves, petioles, and stems. The spots on the leaves are circular, then expand to become large irregular spots with concentric rings, changing from reddish-brown to dark brown, with a grayish-brown center. The spots on stems and petioles are brown and elongated.
② Caryota leaf spot disease. Small black-brown circular spots appear on the leaves, which then expand or merge into large irregular patches with slightly elevated edges, and small black dots are scattered on both sides of the leaves.
③ Clivia leaf spot disease. There are elliptical, elongated light reddish-brown spots on the leaves with a chlorotic ring around them, which then expand to become large irregular patches with black dots on them.
Incidence Pattern: The leaf spot fungus overwinters in diseased residues or on the soil surface, and in the following year, it is spread and infects the host through wind and rain. The leaf spot disease in Celosia is severe during summer and autumn, the leaf spot disease in Caryota is severe during the high-temperature summer months, the leaf spot disease in Clivia occurs in spring and autumn, but it can occur all year round in greenhouses. Continuous cropping, excessive dense planting, poor ventilation, and high humidity all favor the occurrence of the disease.
Control Methods:
① Timely removal of diseased tissue and incineration.
② Crop rotation (soil replacement in greenhouses).
③ Avoid spraying water on the plants.
④ Start spraying fungicides at the early stage of the disease to prevent the spread and progression. Common fungicides include 25% carbendazim wettable powder at 300-600 times dilution, 50% thiophanate-methyl at 1000 times, 70% mancozeb at 500 times, 80% mancozeb-zinc at 400-600 times, and 50% captan at 500 times. It is important to alternate fungicides to prevent the development of resistance.
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