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Stem Rot

Stem Rot

Didymella lycopersici

fungi

In a Nutshell

    Dark sunken spots on the lower part of stalksFruits turn black and shrivelPlant withers

Hosts: %1$s

· Tomato

Symptoms

Black to brown, sunken spots appear on the stalks near the ground. The plant starts to wither. Fruits turn black and start to shrivel up.

Trigger

Spore cushions appear on the affected spots. The fungus spreads in the population via the spores that are transported through wind and rain. Spores can be stirred up from the soil by precipitation. Hibernation of the fungus takes place in plant residues, transmission via seeding material is also possible.

Biological Control

Remove infected plants as fast as possible. Disinfect poles and tools. Replacing the soil can produce good results.

Chemical Control

Dicloran and Chlorotalonil can be useful to prevent new infections.

Preventive Measures

    Avoid contact of leaves with the soilRemove lower leavesWater plants in the morningWater plants only at the baseEnsure diversified crop rotationBe careful to use only healthy seedling material