Micosis/Hongos
Bad Vinous
Rhizoctonia Violacea
Pathogen:
Fungus
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Rhizoctonia violacea is a pathogenic fungus that causes serious diseases in various plants, including beets. This fungus is characterized by the formation of resistance structures called sclerotia, which are compact masses of purple or violet mycelium, capable of surviving in the soil for several years in the absence of a host. When environmental conditions are favorable, especially moist soils and moderate temperatures, sclerotia germinate and produce infectious hyphae. These hyphae grow and penetrate the roots and the base of the stem of the plants, causing necrosis and deterioration of the plant tissue. As the fungus develops, a visible cottony mycelium forms around the infected areas, making it easier to identify.
SYMPTOMS
Wine disease, caused by Rhizoctonia violacea, severely affects beets, compromising both their development and productivity. The disease initially manifests itself as purple Taches on the roots and crown of the plant, which expand and darken over time. These Taches are the result of the breakdown of plant tissue, which turns brown and then black as the disease progresses. Affected plants show poor growth, wilting and, in severe cases, may die.
- Purple Taches on the roots and crown
- Decomposition of plant tissue
- Darkening of Taches to brown and black
- Poor plant growth
- Wilting
- Death of severely affected plants
TEMPERATURE AND HUMIDITY
15°C - 25°C
70% - 90%
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
Treatments allowed 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 PEST
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Effective against all types of fungi
- Implement crop rotation with non-susceptible species to reduce the accumulation of sclerotia in the soil.
- Use resistant beet varieties when available on the market.
- Avoid planting in soils with a history of the disease and improve soil drainage.
- Apply specific fungicides according to technical recommendations and in accordance with current regulations.
- Carry out constant monitoring of the crop to detect early symptoms of the disease.
- Avoid excess irrigation and maintain good soil moisture management.
- Disinfect agricultural tools and equipment to prevent the spread of the fungus.
- Remove and destroy infected crop residues to reduce the presence of sclerotia in the soil.
Recommendations
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