Royas
Rust
Uromyces Betae
Pathogen:
Fungus
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Uromyces betae is a fungus belonging to the Pucciniaceae family, responsible for causing rust in sugar beets. This pathogen is characterized by its complex life cycle that includes several stages and different spore forms. The cycle begins with the germination of spores on the surface of beet leaves, where the fungus penetrates through the stomata and develops mycelium within the leaf tissue. Subsequently, urediniospores form, which spread rapidly by wind and can reinfect plants during the same season, causing new infections. In the last stage of the cycle, the fungus produces teliospores, which are resistance structures capable of surviving adverse conditions during the winter. With the arrival of spring, the teliospores germinate and release basidiospores, which restart the infection process. The ability of Uromyces betae to produce multiple types of spores and survive in different environmental conditions makes disease control especially challenging.
SYMPTOMS
Rust, caused by Uromyces betae, negatively impacts sugar beets, affecting their growth and productivity. The disease manifests itself mainly on the leaves, but can also affect other parts of the plant.
- Appearance of orange or brown pustules on the surface of the leaves.
- These pustules develop into rounded Taches of necrotic tissue.
- Loss of chlorophyll in the affected areas, causing yellowing of the leaves.
- Premature defoliation in severe infections, which decreases photosynthetic capacity.
- Reduction in the general growth of the plant.
- Lower yield in sugar production due to the weakening of the plants.
- In severe cases, death of leaves and significant reduction in the size and quality of the roots.
TEMPERATURE AND HUMIDITY
15-25°C
60-80%
HOW IS IT SPREAD?
Wind, irrigation water, agricultural tools, infected crop remains, direct contact between plants
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• AZOXISTROBIN 20% + TEBUCONAZOLE 20% [SC] P/V
• DIFENOCONAZOLE 10% + FENPROPIDIN 37.5% [EC] P/V
• DIFENOCONAZOLE 25% [EC] P/V
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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- Use rust-resistant sugar beet varieties.
- Carry out crop rotation to minimize the accumulation of spores in the soil.
- Apply preventive and curative fungicides according to technical recommendations and in a timely manner.
- Maintain an adequate planting density to improve air circulation and reduce humidity.
- Remove and destroy remains of infected crops to reduce sources of inoculum.
- Regularly monitor fields to detect disease symptoms early.
- Avoid sprinkler irrigation late in the day to reduce humidity on the leaves.
- Promote the general health of the crop through balanced fertilization and proper irrigation management.
- Implement cultural measures such as weed control that can serve as alternative hosts.
- Use sustainable agricultural practices that favor biological control and biodiversity in the agroecosystem.
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