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Early Blight
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Late Blight
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Septoria
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Photo
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Cause
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fungus: Alternaria solani
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fungus: Phytophthora infestans
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fungus: Septoria lycopersici
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Characteristics
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Dark, concentric spots ¼ – ½” on lower leaves and stems.
Spots on fruit near stems.
Lower leaves yellow and drop.
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Blue-gray spots on leaves which turn brown.
Dropped leaves.
Irregular brown, greasy spots on fruit.
White mold rings on spots.
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Small black or brown spots on the lower leaves.
Lower leaves yellow and drop.
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Parts affected
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leaves
stem
fruit
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leaves
stem
fruit
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leaves
stem
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Timing
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early- to mid-season
in wet weather
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mid- to late-season
in wet weather
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early- to mid-season
in wet weather
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