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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 European pear 3 Tomato 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.

Marguerite

Terminated

Solanum lycopersicum L. · Tomato

NL
3 records

Matthew

Terminated

Solanum lycopersicum L. · Tomato

NL
3 records

Montebello

Terminated

Cucumis sativus L. · Cucumber

NL
2 records

Kirill

Active

Solanum lycopersicum L. · Tomato

HU
2 records

Maxima

Active

Solanum lycopersicum L. · Tomato

NL
2 records

IS Maltea

Protection expired

Hordeum vulgare L. · Barley

SK
3 records

Kunzita

Active

Solanum lycopersicum L. · Tomato

HU
2 records

Kierano

Terminated

Solanum lycopersicum L. · Tomato

NL
2 records

Hansa

Active

Cucumis sativus L. · Cucumber

HU
2 records

Lorena

Terminated

Solanum lycopersicum L. · Tomato

NL
2 records

Lacitrine

Active

Solanum lycopersicum L. · Tomato

HU
2 records

Jud

Active

Cucumis sativus L. · Cucumber

HU
2 records

Lachaman

Active

Solanum lycopersicum L. · Tomato

HU
2 records

Julia

Terminated

Cucumis sativus L. · Cucumber

DK
2 records

Forenza

Active

Solanum lycopersicum L. · Tomato

NL
2 records

Flyer

Terminated

Cucumis sativus L. · Cucumber

NL
3 records

Kalimero

Active

Cucumis sativus L. · Cucumber

CZ
2 records

Kaikura

Active

Cucumis sativus L. · Cucumber

CZ
2 records

Encore

Active

Solanum lycopersicum L. · Tomato

NL
2 records

Helmos

Active

Cucumis sativus L. · Cucumber

NL
2 records

Ilonca

Terminated

Cucumis sativus L. · Cucumber

NL
2 records

Furon

Terminated

Solanum lycopersicum L. · Tomato

NL
2 records

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