Mildew
Peronospora Farinosa
Pathogen:
Type:
Oomycete
Risk:
HIGH
Acelga
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.
TEMPERATURE AND HUMIDITY
10ºC - 20ºC
85% - 100%
TRANSMISSION ROUTES
Wind, water, contact between plants, gardening tools, infected crop residues.
Do you want to remove this disease? Choose how you want to treat it.
TREATMENTS
Chemical treatments
• ORANGE OIL 6% [SL] P/V
• CYMOXANIL 2.85% + FOSETIL-AL 30% + COPPER OXYCHLORIDE 16% (EXPR. IN CU) [WG] P/P
• CYMOXANIL 45% [WG] P/P
• COS-OGA 1.25% [SL] P/V
• FOSETIL 31% + Propamocarb 53% [SL] P/V
• CUPRIC HYDROXIDE 13.6% (EXPR. IN CU) + COPPER OXYCHLORIDE 13.6% (EXPR. IN CU) [SC] P/V
• LAMINARIN 4.5% [SL] P/S
• MANDIPROPAMID 25% [SC] P/V
• METALAXIL 25% [WP] P/P
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 70% (EXPR. IN CU) [SC] P/V
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% (I) [WG] P/P
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WP] P/P
Authorized treatments in organic farming
• ORANGE OIL 6% [SL] P/V
• COS-OGA 1.25% [SL] P/V
• CUPRIC HYDROXIDE 13.6% (EXPR. IN CU) + COPPER OXYCHLORIDE 13.6% (EXPR. IN CU) [SC] P/V
• LAMINARIN 4.5% [SL] P/S
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 70% (EXPR. IN CU) [SC] P/V
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WP] P/P
Biological control
• BACILLUS SUBTILIS (strain IAB/BS03) (1 x 10E8 cfu/ml) 10 g/l [SL] P/V
Recommendations
• Select mildew-resistant chard varieties.
• Maintain good air circulation between plants, spacing them appropriately and avoiding overhead irrigation.
• Implement a drip irrigation system to reduce moisture in the foliage.
• Apply preventive fungicides according to local recommendations and climatic conditions.
• Remove and destroy infected leaves to reduce the source of inoculum.
• Practice crop rotation, avoiding planting chard or other susceptible plants in the same area for at least two years.
• Maintain adequate fertilization, avoiding excess nitrogen, which can favor the development of the fungus.
• Clean and disinfect garden tools to prevent the spread of the pathogen.
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*The recommended treatments are recommendations based on the authorities' databases and do not replace in any way the guidelines established by the legislation of each country.
*Products shown are recommendations and not our own products. As Amazon Associates, we earn revenue from purchases of recommended products.
TREATMENTS
Homemade remedies
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.
RECOMMENDATIONS
REPELLENT PLANTS
EFFECTIVE PRODUCTS TO ELIMINATE THIS DISEASE
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*The recommended treatments are recommendations based on the authorities' databases and do not replace in any way the guidelines established by the legislation of each country.
*Products shown are recommendations and not our own products. As Amazon Associates, we earn revenue from purchases of recommended products.
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