Home › Nursery Stock › Article

How to prevent and treat anthracnose in Euonymus japonicus in landscaping?

Nursery Stock 0 views
[Symptoms] Anthracnose of Euonymus japonicus is distributed nationwide. At the early stage of the disease, water-soaked yellowish-brown small spots appear on the leaves, and the boundary between diseased and healthy tissue is not obvious, after which the spots expand. Later, the affected areas turn yellow, and small black dots (conidial acervuli) appear on the spots, arranged in obvious or inconspicuous concentric rings. It often causes leaf blight and premature leaf drop. [Pathogen and disease pattern] It is caused by the fungi Colletotrichum griseam Heaidet Waif and Gloeosporium frigidium Sate. of the Deuteromycetes

[Symptoms] Anthracnose of Euonymus japonicus is distributed nationwide. At the early stage of the disease, water-soaked yellowish-brown small spots appear on the leaves, and the boundary between diseased and healthy tissue is not obvious, after which the spots expand. Later, the affected areas turn yellow, and small black dots (conidial acervuli) appear on the spots, arranged in obvious or inconspicuous concentric rings. It often causes leaf blight and premature leaf drop.

[Pathogen and disease pattern] It is caused by infection by the fungi Colletotrichum griseam Heaidet Waif and Gloeosporium frigidium Sate. of the Deuteromycetes. The sexual stage is Glomerella, a genus of the Ascomycetes, and pathogens of this genus also attack many flowers and flowering shrubs. It overwinters as conidial acervuli in diseased residues and soil, and can also overwinter as conidia and mycelium on diseased plant tissues. In late spring of the following year, conidia are spread by insects and wind and rain. Conidia invade through stomata or wounds, and Euonymus can be repeatedly infected multiple times during the growing season. The disease is severe in summer and autumn each year. Generally, conditions such as more wounds on the plants, overly dense planting, poor ventilation, excessive nitrogen fertilizer, and weak, spindly plant growth can all worsen the disease.

[Integrated control]

(1) Eliminate sources of inoculum: promptly remove dead branches, fallen leaves and diseased residues, and burn them to reduce reinfection and sources of inoculum.

(2) Strengthen management: do not plant too densely when raising seedlings; try to avoid causing wounds during maintenance; promptly control scale insects; do not sprinkle water when irrigating; and apply more phosphorus and potassium fertilizers, etc.

(3) Chemical control: at the early stage of the disease, spray 80% Carbendazim Thiram wettable powder at 500-800 times dilution, or 25% Oruiyou at 2000 times dilution for control.

Related Articles