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Causal Agent: 

Potyvirus (Onion yellow dwarf virus- OYDV)

Characteristic Symptoms:
 
Early symptoms in young onion plants are yellow streaks at the base of the first leaf.
   
Severe infection result to complete yellowing of leaves, twisting and bending.
   
Bulb remains firm but  size is reduced.
   
Transmission and Spread:
   
It can be transmitted by aphids in a non-persistent manner and through the use of infected planting materials or bulbs.
   
Management and Control:
 
Use tolerant varieties, if available.
   
Remove infected plants as early as the symptoms is observed to prevent or minimize spread.
   
Remove weeds that serve as alternate host.
   
Control minimize aphid population by using plastic mulch, yellow sticky traps and/or use of insecticides such as azadirachtin (neem), cartap hydrochloride (e.g.  PadanⓇ, Barena 50 SP, Gemtrak®), acetamiprid (e.g. MospilanⓇ), acephate (e.g. AcetamⓇ, CompeteⓇ), chlorphenapyr (e.g. Kotetsu) or penthoate (e.g. PennantⓇ, VidexⓇ).

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