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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.

Myrthos

Active

Cucumis sativus L. · Cucumber

NL
3 records

Majestosa

Active

Cucumis sativus L. · Cucumber

NL
3 records

Hamlet

Active

Solanum lycopersicum L. · Tomato

NL
6 records

Elio

Active

Oryza sativa L. · Rice

IT
5 records

Desperado

Active

Solanum lycopersicum L. · Tomato

NL
3 records

Bowing

Active

Cucumis sativus L. · Cucumber

NL
3 records

Bologna

Active

Cucumis sativus L. · Cucumber

NL
3 records

Asef

Active

Cucumis sativus L. · Cucumber

NL
3 records

Babystar

Active

Cucumis sativus L. · Cucumber

NL
3 records

Gravina

Terminated

Cucumis sativus L. · Cucumber

NL
2 records

Natasja F1

Active

Cucumis sativus L. · Cucumber

HR UA
2 records

Singored

Active

Solanum lycopersicum L. · Tomato

CZ
2 records

Salima

Terminated

Cucumis sativus L. · Cucumber

NL
2 records

Montebelo

Terminated

Solanum lycopersicum L. · Tomato

NL
2 records

Mini Star

Active

Solanum lycopersicum L. · Tomato

NL
2 records

Delioso

Terminated

Solanum lycopersicum L. · Tomato

NL
2 records

Dirigent

Active

Cucumis sativus L. · Cucumber

NL
2 records

Corvey

Terminated

Solanum lycopersicum L. · Tomato

NL
2 records

Airbus

Active

Cucumis sativus L. · Cucumber

NL
2 records

Zentai

Active

Cucumis sativus L. · Cucumber

HU
2 records

Verdon

Active

Cucumis sativus L. · Cucumber

NL
2 records

Top Marzia

Terminated

Solanum lycopersicum L. · Tomato

HU
2 records

Top Amit

Terminated

Solanum lycopersicum L. · Tomato

HU
2 records

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