Skip to Main navigation Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension

Extension is almost done building a new website! Please take a sneak peek or read about our redesign process.

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

Print Icon Email Icon Share Icon

Spinach > Leaves > Spots or blotches on leaves

1 of 4
  • Image: Apple Scab 1
  • Image: Apple Scab 2
  • Image: Apple Scab 3

Spinach 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...
2 of 4
  • Image: Apple Scab 1
  • Image: Apple Scab 2
  • Image: Apple Scab 3

White 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
3 of 4
  • Image: Winter Injury 1
  • Image: Winter Injury 2
  • Image: 3

Flea 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...
4 of 4
  • Image: Apple Maggot 1
  • Image: Apple Maggot 2

Downy 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...

Don't see what you're looking for?

  • © Regents of the University of Minnesota. All rights reserved.
  • The University of Minnesota is an equal opportunity educator and employer. Privacy