Onion yellow dwarf disease(Onion Yellow Dwarf Virus)

Symptoms

• The disease is characterized by severe stunting of the plants, and dwarfing and twisting of the flower stalk.
• The affected leaves and stems change their normal green colour to various shades of yellow and leaves tend to flatten and crinkle and as a result bend over.
• Mild chlorotic stripes to bright yellow stripes, mosaic, curling of leaves and stunted growth.
• It is transmitted mechanically as well as by insect vectors.

Management

• Removal and destruction of the diseased plants check the spread of the disease.
• Healthy bulbs should be used for seed production.
• Follow crop rotation of at least three years.
• Use blue sticky trap.
• Conserve the predators such as coccinellids, lacewings, spiders, wasps etc. for controlling thrips.

Chemical Control

Extremely Toxic

Highly Toxic

Moderately Toxic

Slightly Toxic