🍅 Tomato How hard it is to control: ★★★☆☆ 3/5

Bacterial speck of tomato

The most common bacterial disease of tomato. Early infection delays ripening and reduces yield. Development favored by 21-23°C and high humidity.

Symptom photos

Bacterial speck of tomato — Leaf — tiny black, angular specks scattered over the blade — Leaf — tiny black, angular specks scattered over the blade Photo: Alan Collmer, Cornell University, licence CC0

Bacterial speck of tomato — Leaf against the light — specks merging into larger black necrotic patches — Leaf against the light — specks merging into larger black necrotic patches Photo: Alan Collmer, Cornell University, licence CC0

Symptoms

Small round watery spots on leaves
Spots with yellow halo
Perforation and frayed leaf edges
Dark necrotic dots on fruits (approx. 1mm)
Black oval spots on stems and peduncles

What it does to the crop

Delayed fruit ripening
Reduced fruit quality
Yield loss
Premature flower and leaf drop

What encourages it

Infected seeds
Plant debris
Temperature 21-23°C
High humidity

Prevention

Sowing seeds free from pathogen
Disinfection of greenhouse and tools
Care procedures when leaves are dry
Optimal nitrogen fertilization
2-year crop rotation

⚠️ Before you reach for a spray

This atlas is informational and still growing — different diseases can look almost identical. Confirm the diagnosis and read the product label before applying any plant protection product. If you are unsure, ask your local extension or advisory service.

Keep the disease atlas with you in the garden

In the app you can identify a disease from photos, work out the spray dose for your own bed and log the treatment in your task calendar. Free, no sign-up, works offline.

Open the atlas in the app →

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