Causal Agent:
Potyvirus (Shallot yellow stripe virus- SYSV)
| Characteristic Symptoms: | |
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Affected plants show yellow stripes and bending of leaves. |
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Bulb remains firm but size is reduced.
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| Transmission and Spread: | |
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The virus is transmitted by aphids in a non-persistent manner and through the use of infected planting materials or bulbs. |
| Management and Control: | |
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Use tolerant varieties, if available.
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Remove infected plants as early as the symptoms is observed to prevent or minimize spread.
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Remove weeds that serve as alternate host.
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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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