Neck Rot
Botrytis Allii
Pathogen:
Fungus
Type:
Risk:
HIGH
Botrytis
Cebolla
WHO CAUSES IT?
Botrytis alli is a phytopathogenic fungus that causes the disease known as neck rot in onions. This fungus can mainly affect the neck of the plant, as well as the leaves and bulbs. It thrives in conditions of high humidity and moderate temperatures, and produces spores that can spread quickly, infecting other nearby plants.
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SYMPTOMS
Neck rot caused by Botrytis alli can cause the onion neck tissues to decay, which in turn can weaken the plant and lead to premature death. The lesions are usually soft and watery at the beginning of the infection and vary to a brown or gray appearance with the appearance of the typical grayish mold or dust.
• Decomposition of neck tissues.
• Brown or gray appearance in affected areas.
• Appearance of grayish mold
• General weakening of the plant.
• Premature leaf fall.
• Reduction in the quality and quantity of bulbs.
• Bulb rot
TEMPERATURE AND HUMIDITY
15 ºC - 25ºC
80% - 100%
TRANSMISSION PATHS
Spores carried by wind, contaminated irrigation water, direct contact with infected plants, pruning tools.
Do you want to remove this pest? Choose how you want to treat it.
TREATMENTS
Chemical treatment
• AZOXISTROBIN 25% [SC] P/V
• CIPRODINIL 37.5% + FLUDIOXONIL 25% [WG] P/P
• PHENHEXAMIDE 50% [SC] P/V
• FLUOPYRAM 20% + TEBUCONAZOLE 20% [SC] P/V
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% ( ) [WG] P/P
• PYRIMETANIL 40% [SC] P/V
• TEBUCONAZOLE 20% [EW] P/V
• TEBUCONAZOLE 25% [EW] P/V
• TEBUCONAZOLE 50% + TRIFLOXISTROBIN 25% [WG] P/P
Authorized treatments in organic farming
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
Biological control
• CLONOSTACHYS ROSEA CEPA J1446 (GLIOCLADIUM CATENULATUM (CEPA J1446)) (1 x 10E 9 cfu/g) 900 g/kg [WG] P/P
• PYTHIUM OLIGANDRUM (strain M1) 17.5% [WP] P/P
Recommendations
• Maintain good soil drainage to avoid excess moisture.
• Avoid overhead irrigation to minimize moisture on leaves and collars.
• Use specific fungicides during critical stages of the growth cycle.
• Remove and destroy affected parts of the plant to prevent spread.
• Promote air circulation between plants to reduce humidity.
• Carry out a crop rotation to avoid the accumulation of pathogens in the soil.
• Clean and disinfect pruning and harvesting tools.
• Perform constant monitoring to identify early infections.
• Avoid storing bulbs in high humidity conditions.
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TREATMENTS
Homemade 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.
RECOMMENDATIONS
- Check the back of the leaves frequently, especially in dry weather.
- Spray water on the leaves to increase humidity and prevent them from settling.
- Keep plants healthy with good watering and adequate light.
- If you see cobwebs or damage, clean the leaves with a damp cloth or pressurized water.
- Use potassium soap or neem oil every few days until they disappear.
REPELLENT PLANTS
Rosemary, Dill, Coriander
RECOMMENDED PRODUCTS TO ELIMINATE THIS PEST
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*The recommended treatments are still recommendations according to the databases of the authorities and at no time do they replace the guidelines established according to the legislation of each country
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