Micosis/Hongos
Brown crown and root rot: what it is, how it occurs, and how to effectively eliminate it
Brown Crown And Root Rot
Rhizoctonia Solani
Pathogen:
Fungus
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Rhizoctonia solani is a soil pathogenic fungus that affects a wide variety of plants, including beet. This fungus is capable of producing sclerotia, which are dark brown to black tough structures that can survive in soil for long periods, even in the absence of a suitable host. When environmental conditions are favorable, especially in the presence of high humidity and moderate to warm temperatures, sclerotia germinate and produce hyphae that invade the roots and crowns of susceptible plants. The hyphae grow through plant tissue, causing necrosis and decomposition of infected tissues. Rhizoctonia solani can also produce spores, although its main method of survival and propagation is through sclerotia.
SYMPTOMS
Brown crown and root rot, caused by Rhizoctonia solani, is a devastating disease of beet. This fungus infects the underground parts of the plant, causing a series of symptoms that affect both the development and yield of the crop. The disease initially manifests itself as brown Taches at the base of the plant, which progressively expand. The roots and crown are affected, showing dark brown decay and tissue collapse. Affected plants usually show stunted growth and may die if the infection is severe. The roots become soft and give off an unpleasant odor as the rot progresses.
- Brown Taches at the base of the plant
- Dark brown decay on roots and crown
- Stunted growth
- Death of severely infected plants
- Soft roots with an unpleasant odor
TEMPERATURE AND HUMIDITY
18°C - 28°C
60% - 80%
HOW IS IT SPREAD?
Sclerotia in soil, contaminated tools, irrigation water, infected planting material, crop residues
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• AZOXISTROBIN 25% [SC] P/V
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% ( ) [WG] P/P
Authorized treatments in organic farming
-
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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- Rotate crops with non-susceptible plants to reduce the accumulation of sclerotia in the soil.
- Use resistant beet varieties when available.
- Avoid planting in soils with a history of the disease or in poorly drained fields.
- Implement soil management practices that improve drainage and reduce compaction.
- Apply specific fungicides as a preventive measure, following the dose and frequency recommendations.
- Carry out constant monitoring of the culture to detect the first signs of the disease and act quickly.
- Avoid excess watering and maintain adequate soil ventilation.
- Disinfect agricultural tools and equipment to prevent the spread of the fungus.
Recommendations
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