Alternariosis
WHAT IS AND HOW TO ELIMINATE
Early Blight Or Alternariosis
Alternaria Solani / Alternaria Alternata
Pathogen:
Fungus
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Alternaria solani and Alternaria alternata are phytopathogenic fungi that cause the disease known as early blight or alternariosis in potatoes. These fungi produce spores that spread through air, water and soil, infecting potato plants primarily in warm, humid conditions. The fungus can survive in soil and infected plant remains for long periods. During the growing season, spores can infect potato leaves, stems and tubers, causing significant damage.
SYMPTOMS
Early blight or alternariosis produces lesions on the leaves, stems and tubers of the potato. On leaves, symptoms include dark, concentric Taches, which can cause premature defoliation. On the stems, the fungus can cause lesions and weaken the plant. In tubers, infections can cause rot and reduce the quality of the crop.
• Dark, concentric Taches on the leaves.
• Injuries to the stems and weakening of the plant.
• Rot and lesions on the tubers.
• Premature defoliation and reduction in crop quality.
TEMPERATURE AND HUMIDITY
20°C - 30°C
80% - 100%
HOW IS IT SPREAD?
Spores carried by air, water, soil, infected plant remains, contaminated growing tools.
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• AZOXISTROBIN 25% [SC] P/V
• CYMOXANIL 2.85% + FOSETIL-AL 30% + COPPER OXYCHLORIDE 16% (EXPR. IN CU) [WG] P/P
• CYMOXANIL 3% + CUPROCALCIC SULFATE 22.5% (EXPR. IN CU) [WP] P/P
• CYMOXANILE 4% + FOLPET 25% + FOSETIL-AL 50% [WG] P/P
• DIFENOCONAZOLE 1.67% [EC] P/V
• DIFENOCONAZOLE 25% [EC] P/V
• FOLPET 10% + CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WP] P/P
• FOLPET 50% [SC] P/V
• FOLPET 80% [WG] P/P
• CUPRIC HYDROXIDE 13.6% (EXPR. IN CU) + COPPER OXYCHLORIDE 13.6% (EXPR. IN CU) [SC] P/V
• CUPRIC HYDROXIDE 20% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 50% (EXPR. IN CU) [WP] P/P
• Mandipropamide 25% + DIFENOCONAZOLE 25% [SC] P/V
• METALAXIL 8% + COPPER OXYCHLORIDE 40% (EXPR. IN CU) [WP] P/P
• METIRAM 70% [WG] P/P
• COPPER OXYCHLORIDE 25% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 30% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 35% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 37.5% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 38% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 70% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 70% [SC] P/V
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
• CUPROCALCIC SULFATE 20% [WP] P/P
• TRIBASIC COPPER SULFATE 19% (EXPR. IN CU) [SC] P/V
• ZOXAMIDE 5.88% + COPPER OXYCHLORIDE 25% (Exp. in Cu) [WG] P/P
Authorized treatments in organic farming
• CUPRIC HYDROXIDE 13.6% (EXPR. IN CU) + COPPER OXYCHLORIDE 13.6% (EXPR. IN CU) [SC] P/V
• CUPRIC HYDROXIDE 20% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 25% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 30% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 35% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 37.5% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 38% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 70% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 70% [SC] P/V
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
• CUPROCALCIC SULFATE 20% [WP] P/P
• TRIBASIC COPPER SULFATE 19% (EXPR. IN CU) [SC] P/V
Insect allies
EFFECTIVE PRODUCTS TO ELIMINATE THIS PEST
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• Use potato varieties resistant to Alternaria solani and Alternaria alternata.
• Apply specific fungicide treatments in the critical phases of plant development.
• Avoid excess moisture in the soil and foliage, as it favors the development of fungi.
• Improve ventilation in the crop through pruning and proper spacing management.
• Remove and destroy the remains of infected plants to reduce the presence of spores in the field.
• Carry out crop rotation with non-host plants to reduce the persistence of fungi in the soil.
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