Yellow dwarf virus is a viral disease that affects onion leaves, leading to poor growth and decreased productivity. This article from the “WORLD OF PLANTS” website provides an explanation of the symptoms of yellow dwarf virus on onion leaves and methods of prevention and control.
Causes of yellow dwarf virus on onion leaves
- Disease name: Onion yellow dwarf virus
- Scientific name: Onion yellow dwarf virus (OYDV)
- Type of disease: viral
- Disease family: Potyviridae
The yellow dwarf virus targets onion plants and is transmitted mainly by aphids, which transmit it quickly to the plant and do not retain it for a long time. Therefore, controlling aphids does not prevent the infection from occurring, but it reduces the severity of the spread of the disease.
Symptoms of yellow dwarf virus on onion leaves
The initial symptoms of infection appear on the leaves, ranging from the appearance of yellow lines to complete yellowing of the leaf. The leaves become flat, wrinkled, and bend downward, and leaves close to the soil fall. Over time, the plants wither and become stunted, and the fruits usually remain firm but do not reach their full size.
Development cycle of yellow dwarf virus on onion leaves
The yellow dwarf virus is transmitted during vegetative propagation or through insects such as the green peach aphid in addition to other aphids, where it spreads the virus from one plant to another in a non-continuous manner.
Suitable conditions for the spread of yellow dwarf virus on onion leaves
The disease affects the plant throughout the season, but it may increase at the beginning of summer with the spread of aphids.
Losses resulting from the spread of yellow dwarf virus on onion leaves
The virus stimulates the vegetative growth of onions during storage, and seeds taken from infected plants are of poor quality.
Controlling yellow dwarf virus on onion leaves
- Organic control: Getting rid of plant remains and weeds in the field and eradicating infected plants limits the spread of the virus, and using neem oil to combat aphids helps limit the spread of the disease.
- Chemical control: There is no chemical pesticide that fights the virus.
Preventive measures for yellow dwarf virus on onion leaves
- Use disease-resistant varieties.
- Planting in virus-free soil.
- Sterilize agricultural tools before use.
- Monitor the crop constantly for early detection of infection.
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Sources:
Onion Yellow Dwarf – UNIVERSITY OF CALIFORNIA AGRICULTURE
Onion Yellow Dwarf – Vegetables by Bayer
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