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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Garlic > Flecks, spots, streaks or blotches on leaves

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Garlic > Leaves > Flecks, spots, streaks or blotches on leaves

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  • Image: Onion Yellow Dwarf Virus 1
  • Image: Onion Yellow Dwarf Virus 2
  • Image: Onion Yellow Dwarf Virus 2

Garlic rust
Puccinia alli

  • Small bright orange spots on leaves and stems
  • Black spots develop on the edge of orange spots
  • If many leaf spots occur, leaves wilt, turn yellow, dry out
  • Bulbs are small, poor quality, and may lack outer dry skin
  • More information on Garlic rust ...
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  • Image: Onion Yellow Dwarf Virus 1
  • Image: Onion Yellow Dwarf Virus 2

Onion yellow dwarf virus

  • First see yellow streaks at the base of young leaves
  • Eventually all leaves show yellow streaking to complete yellowing
  • Leaves are crinkled, flattened and fall over
  • Bulbs fail to form if plants are infected when young or are firm but small when infected later in the season
  • Disease spread by the green peach aphid
  • More information on Onion Yellow Dwarf Virus ...
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  • Image: Downy Mildew 1
  • Image: Downy Mildew 2
  • Image: Downy Mildew 3

Downy mildew
Peronospora destructor

  • Leaves develop elongated pale green to tan spots
  • Purplish gray fuzzy growth develops on leaves
  • Severely infected leaves collapse and die
  • Plants may produce small bulbs
  • Disease is most severe in cool wet weather
  • More information on Downy Mildew...

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