Virus
Beet yellows virus: what it is, how it originates, and how to eliminate it effectively.
Beet Yellowness Virus
Beet Yellow Virus (Byv)
Pathogen:
Virus
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Beet Yellow Virus (BYV) is a pathogenic virus that belongs to the Closteroviridae family and mainly affects sugar beet. This virus is transmitted by aphids, especially the peach aphid (Myzus persicae), in a process that involves the insect acquiring the virus while feeding on an infected plant. The virus then replicates within the aphid's body and is introduced into healthy plants during subsequent feeding. Once inside the plant, BYV moves through the phloem, affecting nutrient transport and causing a variety of symptoms. Infection can persist throughout the host's life cycle, with the ability to overwinter in perennials and emerge in subsequent seasons, contributing to the spread of the virus. Virus replication and the appearance of symptoms are favored by certain environmental conditions, such as moderate temperatures and high density of aphids.
SYMPTOMS
Beet yellowness virus, caused by BYV, produces a debilitating disease in sugar beet, significantly affecting plant growth and yield. The disease is characterized by yellowing and necrosis of the leaves, which reduces the photosynthetic capacity and, consequently, the sugar content in the roots.
- Progressive yellowing of old leaves.
- Necrosis and death of affected leaves.
- Curling and fragility of the leaves.
- Reduction in the size of the roots.
- Decrease in the sugar content of the roots.
- Lower general vigor of the plant.
TEMPERATURE AND HUMIDITY
15°C - 25°C
60% - 80%
HOW IS IT SPREAD?
Aphids, Infected planting material, Perennial plants, Remains of infected crops
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
There are no effective treatments against viruses, the treatments are focused on combating the insect or vector carrying the virus (SEE AVAILABLE TREATMENTS AGAINST INSECTS)
Authorized treatments in organic farming
There are no effective treatments against viruses, the treatments are focused on combating the insect or vector carrying the virus (SEE AVAILABLE TREATMENTS AGAINST INSECTS)
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 sugar beet varieties resistant or tolerant to BYV.
- Implement an aphid control program through the use of specific insecticides and natural predators.
- Promote crop rotation to reduce pathogen and vector pressure on the soil.
- Maintain clean cultivation practices, eliminating infected plant residues and weeds that may harbor aphids.
- Avoid sprinkler irrigation that favors the dispersal of aphids.
- Regularly monitor crops for early detection of aphids and BYV symptoms.
- Implement physical barriers such as anti-insect mesh to reduce the entry of aphids into crops.
- Apply mineral oils that interfere with the transmission of the virus by aphids.
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