Alternariosis
Brown Citrus Spot
Alternaría Citri
Pathogen:
Fungus
Type:
Risk to the plant:
INTERMEDIATE
DESCRIPTION
WHO CAUSES IT?
Alternaria citri is a phytopathogenic fungus that affects citrus trees, causing the disease known as citrus brown spot or alternariosis. This fungus produces spores (conidia) that spread through the air, infecting new plants. Alternaria citri can survive on infected plant debris as well as in soil. The fungus germinates under favorable conditions, invading plant tissues and causing lesions on leaves, stems and fruits.
SYMPTOMS
Citrus brown spot caused by Alternaria citri manifests itself with the appearance of brown Taches on the leaves, stems and fruits. The lesions can expand and cause necrosis, weakening the plant and affecting its productivity. In fruits, lesions can cause a reduction in commercial quality.
• Appearance of brown Taches on leaves, stems and fruits.
• Lesions that can expand and cause necrosis.
• Weakening of the plant and reduction in the quality of the fruits.
• Possible premature fall of affected fruits.
TEMPERATURE AND HUMIDITY
20°C - 30°C
75% - 90%
HOW IS IT SPREAD?
Air, contact with infected plants, water, contaminated tools.
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• CUPRIC HYDROXIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 30% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 35% (exp. 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
• PIRACLOSTROBIN 20% [WG] P/P
• CUPROCALCIC SULFATE 12.4% (EXPR. IN CU) [SC] P/V
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
• TRIBASIC COPPER SULFATE 19% (EXPR. IN CU) [SC] P/V
Authorized treatments in organic farming
• CUPRIC HYDROXIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 30% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 35% (exp. 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
• CUPROCALCIC SULFATE 12.4% (EXPR. IN CU) [SC] P/V
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
• TRIBASIC COPPER SULFATE 19% (EXPR. IN CU) [SC] P/V
Insect allies
PREDATORY MITES
LADYBUGS
LACEWINGS
PARASITIC WASPS
HOVERFLIES OR PARASITIC FLIES
PREDATORY BUGS
There are no natural allies
Mycodiplosis oidii (predatory mosquito)
EFFECTIVE PRODUCTS TO ELIMINATE THIS DISEASE
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• Use citrus varieties resistant or tolerant to Alternaria citri.
• Practice proper pruning to improve air circulation and reduce humidity.
• Disinfect pruning tools and equipment to prevent the spread of the fungus.
• Apply specific fungicides following local recommendations.
• Avoid excess humidity in crops, maintaining good irrigation management.
• Remove and destroy infected plant parts and plant remains.
Recommendations
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