Virus
Onion Yellow Dwarf
Oydv (Onion Yellow Dwarf Virus)
Pathogen:
Virus
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Onion yellow dwarf virus (OYDV) is a virus that belongs to the genus Potyvirus within the family Potyviridae. This pathogen is known to affect plants in the Alliaceae family, including garlic. OYDV is a positive single-stranded RNA virus that is primarily transmitted through vectors such as aphids, as well as by the use of infected plant material. Once the virus enters the plant, it replicates in the cytoplasm of infected cells, systematically spreading through the phloem vessels. Symptoms of infection appear when the virus interferes with the normal metabolism of the plant, resulting in the manifestation of visible signs of the disease. The virus can survive in perennial plants and infected plant material, facilitating its persistence and dissemination in crops.
SYMPTOMS
The disease caused by OYDV in garlic is known as onion yellow dwarf, which also severely affects garlic plants. OYDV infection causes a significant reduction in the growth and development of garlic, affecting both the quality and quantity of production. Symptoms begin with yellowing and downward curvature of the leaves, followed by dwarfing of the plant and reduction in the size of the bulbs.
- Yellowing of the leaves
- Descending curvature of the leaves
- Plant dwarfism
- Reduction in bulb size
- Deformation of the leaves
- Yellow streaks on the leaves.
TEMPERATURE AND HUMIDITY
15-25°C
60-80%
HOW IS IT SPREAD?
Aphids, infected planting material, contaminated tools, grafts, plant contact
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 of certified and virus-free planting material.
- Implementation of vector control programs to reduce the aphid population.
- Eradication of infected plants to prevent the spread of the virus.
- Regular monitoring of crops for early detection of symptoms.
- Application of specific insecticide treatments to control aphids.
- Maintain an adequate distance between plantations to limit the spread of the virus.
- Use of garlic varieties resistant to the OYDV virus.
- Sanitation practices, including disinfection of agricultural tools and equipment.
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