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.

Dee Pend

Active

Cucumis sativus L. · Cucumber

Enza Zaden Beheer B.V.

4 records

Dee Freece

Active

Cucumis sativus L. · Cucumber

Enza Zaden Beheer B.V.

4 records

Dee Rect

Active

Cucumis sativus L. · Cucumber

Enza Zaden Beheer B.V.

4 records

Climont

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

7 records

Chopin

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

3 records

Cladostar

Active

Solanum lycopersicum L. · Tomato

Sakata Vegenetics (Pty) Ltd (ZA)/Sakata Seed Sudamerica Ltd (BR)

3 records

Corentine

Active

Cucumis sativus L. · Cucumber

Seminis Vegetable Seeds

5 records

Coldsun

Withdrawn

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Cappricia

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Cetia

Application submitted

Solanum lycopersicum L. · Tomato

Clause Vegetable Seeds

4 records

Cloud

Active

Cucumis sativus L. · Cucumber

Wing Seed

4 records

Carpenter

Active

Solanum lycopersicum L. · Tomato

Gautier Semences SAS (FR)

3 records

Clarabella

Protection expired

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)

3 records

Buvena

Active

Solanum lycopersicum L. · Tomato

SYNGENTA SEEDS B.V.

5 records

Bozak

Terminated

Solanum lycopersicum L. · Tomato

Enza Zaden Beheer B.V.

5 records

Bostina

Protection expired

Solanum lycopersicum L. · Tomato

Syngenta Seeds, NL

3 records

Carambole

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Braganza

Active

Cucumis sativus L. · Cucumber

Enza Zaden Beheer B.V.

5 records

Blueheaven

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Boreal

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Bigdena

Active

Solanum lycopersicum L. · Tomato

SYNGENTA SEEDS B.V.

3 records

Bonera

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Benvolietto

Active

Solanum lycopersicum L. · Tomato

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Bohemia

Active

Cucumis sativus L. · Cucumber

SEMO A.S., CZ

3 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

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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.