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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Spinach > Spots or blotches on leaves

Spinach > Leaves > Spots or blotches on leaves

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  • Image: Apple Scab 1
    Credit: Kathy Urberg
  • Image: Apple Scab 2

    Credit: Whitney Cranshaw, Colorado State University, Bugwood.org

  • Image: Apple Scab 3

    Credit: Whitney Cranshaw, Colorado State University, Bugwood.org

  • - CLICK PHOTOS TO ENLARGE -

green arrowSpinach Leafminer
Pegomya hyoscyami

  • Larvae tunnel into leaves creating mines that begin long and narrow and eventually becoming an irregularly shaped blotch area
  • Mines are opaque at first and then later turn brown.
  • Larvae are a carrot-shaped, whitish maggot
  • Present throughout the growing season
  • More information on Spinach Leafminer...
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  • Image: Apple Scab 1
    Credit: Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
  • Image: Apple Scab 2

    Credit: Dr. Meg McGrath, Cornell University

  • Image: Apple Scab 3

    Credit: Dr. Meg McGrath, Cornell University

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green arrowWhite Rust
Albugo occidentalis

  • Leaf surfaces have raised white pustules or blisters
  • Pustules may be surrounded by a yellow halo or occur in concentric rings
  • Leaf surface around pustule eventually turns brown and dies
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  • Image: Winter Injury 1
    Credit: Whitney Cranshaw, Colorado State University, Bugwood.org
  • Image: Winter Injury 2

    Credit: Whitney Cranshaw, Colorado State University, Bugwood.org

  • Image: 3

    Credit: Eric Burkness, University of Minnesota

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green arrowFlea Beetles
Disonycha xanthomelas, Systena blanda, and Phyllotreta spp.

  • Adult feeding on leaves creates shallow pits and small, irregular holes giving it a "shot hole" appearance
  • Heavy feeding may cause wilting
  • Adults are small (1/16 to 1/8 inch long), and vary in color from black, bronze, bluish, or brown to metallic gray, while some species have stripes
  • Present throughout the growing season
  • More information on Flea Beetles...
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  • Image: Apple Maggot 1
    Credit: L.J. du Toit, Washington State University Mount Vernon NWREC
  • Image: Apple Maggot 2

    Credit: L.J. du Toit, Washington State University Mount Vernon NWREC

  • - CLICK PHOTOS TO ENLARGE -

green arrowDowny Mildew
Peronospora farinose f.sp. spinaciae

  • Irregular yellow spots on upper leaf surface
  • Fuzzy gray growth on leaf spots on the underside of the leaves
  • Leaves become water soaked, turn yellow, than brown, finally black and rotten
  • Disease is common in cool wet weather
  • More information on Downy Mildew...

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