Antracnosis
Anthracnose
Colletotrichum Circinans
Pathogen:
Fungus
Type:
Risk to the plant:
INTERMEDIATE
DESCRIPTION
WHO CAUSES IT?
Colletotrichum circinans is a phytopathogenic fungus that causes the disease known as anthracnose in onion crops. This fungus is characterized by forming sporulation structures (conidia) in concentric circles, hence its name. These spores are released into the air and water, facilitating the spread of the disease. The pathogen can survive in infected plant remains and in the soil, thus being able to reactivate the infection in the following growing season.
SYMPTOMS
The anthracnose caused by this fungus on onions manifests itself as dark, sunken or depressed Taches on the leaves and bulbs. These Taches can enlarge and become lesions with dark edges, affecting the plant's growth capacity and reducing the quality of the bulbs.
• Dark, sunken or depressed Taches on the leaves.
• Lesions with dark borders that expand and may cover significant areas.
• Decomposition and necrosis of infected tissues.
• Reduction in the quality and quantity of the harvest due to damage to the bulbs.
TEMPERATURE AND HUMIDITY
20 ºC - 28°C
70% - 90%
HOW IS IT SPREAD?
Air, water, infected plant remains.
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• CUPRIC HYDROXIDE 20% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 25% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 36% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 30% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 35% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 38% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• CUPROUS OXIDE 75% (EXPR. IN CU) [WG] P/P
• 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
• TRIBASIC COPPER SULFATE 40% (EXPR. IN CU) [WG] P/P
Authorized treatments in organic farming
• CUPRIC HYDROXIDE 20% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 25% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 36% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 30% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 35% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 38% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• CUPROUS OXIDE 75% (EXPR. IN CU) [WG] P/P
• 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
• TRIBASIC COPPER SULFATE 40% (EXPR. IN CU) [WG] P/P
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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To prevent and control this disease in onion, it is important to follow a comprehensive crop management approach that includes cultural practices and the proper use of fungicides.
• Rotate crops to reduce fungal pressure on the soil.
• Eliminate infected crop remains and plant residues to minimize spread.
• Make sure to maintain good air circulation between the plants.
• Apply specific fungicides according to local recommendations.
• Use onion varieties resistant to the disease.
• Carry out regular monitoring to detect and treat the infection in time.
Recommendations
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