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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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
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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
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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
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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
