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How to recognize and combat mildew on chard
Mildew
Oomycete
Type:
Risk to the plant:
HIGH
Peronospora Farinosa
Pathogen:
Mildiu
WHO CAUSES IT?
Peronospora farinosa is an oomycete fungus that causes downy mildew on various plants, including chard. This pathogen develops and thrives in moist, cool conditions, producing spores that are spread by wind and water. The life cycle of Peronospora farinosa begins with the germination of spores on the surface of the leaves of the host plant. The spores produce germ tubes that penetrate the leaf tissues, where the fungus develops intercellularly, extracting nutrients from the cells through haustoria. As the fungus grows, it produces reproductive structures called sporangiophores, which emerge through the stomata of the leaves, releasing new spores into the environment. This process can be repeated several times during a growing season, especially under favorable weather conditions, allowing for rapid spread of the fungus.
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SYMPTOMS
In chard, mildew caused by Peronospora farinosa causes symptoms that seriously affect the quality and yield of the plant. Infection generally begins on the youngest leaves, where chlorotic or yellowish Taches appear on the upper surface of the leaves. These Taches can expand and merge, forming large, necrotic areas. On the underside of the leaves, grayish or purple downy growth can be observed, which is a distinctive feature of downy mildew.
• Chlorotic or yellowish Taches on the upper surface of the leaves.
• Necrotic areas on the leaves.
• Grayish or purple hairy growth on the underside of leaves.
• Premature defoliation.
• Delay in plant growth.
• Reduction in the quality and quantity of the harvest.
DEVELOPMENT CONDITIONS
Temperature:
10ºC - 20ºC
Humidity:
85% - 100%
HOW IS IT SPREAD?
Wind, water, contact between plants, gardening tools, infected crop residues.
HOW TO ELIMINATE IT?
Home treatments
There are no home treatments
Natural allies
Chemical treatments
There are no treatments for this disease. Treatments are directed at the insect vectors that transmit it. See insect treatments.
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RECOMMENDATIONS
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