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Onion yellow dwarf
Onion yellow dwarf virus
  • allium virus 1 

Plant hosts
All Allium species are susceptible to onion yellow dwarf including onions, garlic, ornamental alliums, and shallots. 

Infected leaves have symptoms ranging from yellow streaks to complete yellowing. Leaves tend to flatten, crinkle, twist, and fall over. Plants may be wilted and dwarfed and bulbs usually remain solid but do not reach their normal size. In seed crops, plants produce smaller flower clusters and fewer florets.
Symptomatic onion plant
Healthy onion plant on the left and a symptomatic onion plant on the right.

Onion yellow dwarf virus is transmitted during propagation and by the aphid vector Myzus persica and several other aphids. It is not transmitted by contact between plants, seed, or pollen.

Geographic distribution
Onion yellow dwarf has been reported from most countries where onions and shallots are cultivated.

Applicable regulations
603-052-0350, Control area order; Onion yellow dwarf
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