Early Blight vs Late Blight on Tomatoes

Early blight and late blight are often confused, but they are very different problems that require different responses. Knowing which blight you’re dealing with can mean the difference between saving your crop and losing it completely.

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This guide clearly explains the differences, symptoms, causes, and what action to take for each.

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What Is the Difference Between Early Blight and Late Blight?

Feature	Early Blight	Late Blight
Speed of spread	Slow to moderate	Very fast
Severity	Manageable if caught early	Highly destructive
Weather preference	Warm, damp	Cool, wet
Affects	Mainly leaves, sometimes fruit	Leaves, stems, fruit
Crop survival	Often salvageable	Rarely salvageable

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Early Blight on Tomatoes (Alternaria)

Early blight is the more common and less aggressive of the two. Plants can often continue cropping if action is taken early.

Symptoms of Early Blight

• Brown or dark spots on lower leaves
• Yellowing around leaf spots
• Distinct concentric “ring” patterns (bullseye effect)
• Gradual leaf drop from the bottom upwards
• Occasional dark lesions on fruit near the stem

Early blight usually starts on older, lower leaves and progresses slowly.

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Conditions That Cause Early Blight

Early blight thrives when:

• Weather is warm and humid
• Leaves stay damp for long periods
• Plants are stressed or underfed
• Airflow is poor

It often appears mid to late season.

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Can You Save Plants with Early Blight?

Yes — in many cases.

What to do immediately:

• Remove affected leaves
• Improve airflow
• Keep foliage dry
• Feed and water consistently

Plants often continue producing healthy fruit after treatment.

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Late Blight on Tomatoes (Phytophthora)

Late blight is far more serious and spreads extremely quickly in the right conditions.

Symptoms of Late Blight

• Dark brown or black patches on leaves
• Oily or water-soaked appearance
• Rapid wilting and collapse of foliage
• Black lesions on stems
• Firm, brown patches on fruit

Plants can collapse within days, sometimes overnight.

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Conditions That Cause Late Blight

Late blight thrives when:

• Temperatures are cool (10–20°C)
• Humidity is high
• Rainfall is frequent
• Leaves remain wet

These conditions are common in UK summers.

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Can You Save Plants with Late Blight?

Usually no once it is established.

What to do immediately:

• Harvest all usable fruit
• Remove and destroy the plant
• Do not compost infected material

Leaving plants in place risks spreading blight to nearby crops.

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Key Visual Differences

Early Blight

• Yellowing leaves with dark spots
• Ringed or target-like patterns
• Slow progression

Late Blight

• Dark, blotchy patches
• Oily or greasy appearance
• Rapid plant collapse

If the plant deteriorates very quickly, it is almost always late blight.

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How Control Methods Differ

Controlling Early Blight

• Remove affected leaves promptly
• Improve spacing and airflow
• Avoid overhead watering
• Keep plants well fed but not overfed

Early blight control is about management and plant health.

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Controlling Late Blight

• Remove plants immediately
• Harvest fruit straight away
• Dispose of plants off-site

Late blight control is about containment, not cure.

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Which Blight Is More Common?

• Early blight: More common overall
• Late blight: More destructive, especially outdoors

Late blight is more closely linked to wet, cool summers.

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How to Reduce Risk of Both Types

• Grow tomatoes under cover where possible
• Remove lower leaves touching the soil
• Space plants generously
• Water at the base only
• Avoid excessive nitrogen feeding
• Practise strict hygiene

These steps reduce risk for both early and late blight.

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Common Mistakes When Blight Appears

• Waiting too long to act
• Composting infected leaves
• Overwatering stressed plants
• Ignoring early symptoms
• Assuming both blights behave the same

Correct identification is crucial.

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Final Thoughts

Early blight and late blight may share a name, but they behave very differently. Early blight is often manageable, while late blight requires immediate removal of plants to protect the rest of your garden.

If blight spreads slowly and starts on lower leaves, act quickly — you may save the crop. If plants collapse rapidly in cool, wet weather, harvest what you can and remove plants immediately.

Knowing the difference gives you control — and can save your tomatoes.

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