Diseases

Leaf mold (brown leaf spot)

Passalora fulva

Leaf mold is a dangerous fungal disease of tomatoes causing premature leaf drying and yield loss. It develops predominantly in greenhouses under high humidity, manifesting as spotting and a velvety coating.

Mentioned in descriptions 5 283 varieties reference book.

Leaf mold manifests as chlorotic light-yellow spots on the upper side of the leaf blade, which eventually turn brown. On the underside of the leaf in the affected areas, a characteristic velvety coating develops, changing color from gray-white to olive or brown. The disease usually begins with the lower tier of leaves, leading to their abscission and a significant decrease in the photosynthetic activity of the plant.

The development of the pathogen depends directly on the microclimate in protected ground, where a high relative humidity of 75% and temperatures in the 20–27°C range create a favorable environment. A critical factor is the presence of condensation on the leaf surface, which promotes the germination of fungal spores. The incubation period of the infection ranges from 10 to 15 days.

Varietal resistance is provided by genetic Cf-genes that operate on the principle of recognizing parasite effectors and triggering a hypersensitive response. Since the fungus has high variability and the ability to form new races that overcome protection, gene pyramiding is used in breeding. Resistance assessment in variety testing is conducted using laboratory methods and in infectious backgrounds based on the absence of sporulation.

Sources10

Breakdown by crop

Tomato Leaf Mold 1 086 Cucumber Scab 568 Tomato Leaf Mold 22 Leaf mold — Tomato (interspecific hybrids) 18 Cladosporium leaf blotch — Soft wheat 15 Melon Scab 5 Cladosporium Spot of Barley 3 Leaf mold of Solanum lycopersicum x Solanum pimpinellifolium interspecific hybrid 3

Found in these crops

Tomato 1 141 Cucumber 474 Tomato 23 hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner 21 Tall fescue 16 Bread wheat 9 Perennial ryegrass 8 Garden strawberry 6 Barley 5 Melon 4 Tomato 3 Potato 3

Varieties that feature this in their description

Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.

Duc de Bordeau

Active

Pyrus communis L. · European pear

2 records

Dometica

Active

Solanum lycopersicum L. · Tomato

2 records

Global

Terminated

Solanum lycopersicum L. · Tomato

2 records

Datis

Active

Cucumis sativus L. · Cucumber

2 records

Gualdino

Terminated

Solanum lycopersicum L. · Tomato

2 records

Delicacy

Active

Solanum lycopersicum L. · Tomato

2 records

Dreamliner

Active

Cucumis sativus L. · Cucumber

3 records

Cypria

Terminated

Cucumis sativus L. · Cucumber

2 records

Cydora

Active

Cydonia oblonga Mill. · Quince

3 records

Elegance

Terminated

Solanum lycopersicum L. · Tomato

2 records

Claree

Terminated

Solanum lycopersicum L. · Tomato

2 records

Casania

Terminated

Solanum lycopersicum L. · Tomato

2 records

Cherubino

Terminated

Cucumis sativus L. · Cucumber

2 records

Denali

Active

Cucumis sativus L. · Cucumber

3 records

Extase

Terminated

Solanum lycopersicum L. · Tomato

2 records

Delano

Terminated

Cucumis sativus L. · Cucumber

2 records

Bubu

Active

Solanum lycopersicum L. · Tomato

2 records

Brunito

Active

Solanum lycopersicum L. · Tomato

2 records

Efialto

Terminated

Solanum lycopersicum x Solanum pimpinellifolium · Tomato

2 records

Cirano

Active

Solanum lycopersicum L. · Tomato

2 records

Bucanero

Active

Solanum lycopersicum L. · Tomato

2 records

Bocati

Active

Solanum lycopersicum L. · Tomato

3 records

Dias

Terminated

Cucumis sativus L. · Cucumber

2 records

Echelon

Active

hybrids between Solanum lycopersicum L. and S. habrochaites S. Knapp & D.M. Spooner

2 records

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Diseases

Powdery mildew 33 570
Fusarium wilt and blight 29 887
Viral mosaic diseases 22 022
Downy mildew 16 384
Leaf spot diseases 15 926
Rust 14 859
Verticillium wilt 12 175
Scab 12 064

All terms →

Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.