Merengue
ActiveCucumis sativus L. · Cucumber
SVS HOLLAND BV , NL
NL
4 records
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.
Breakdown by crop
Found in these crops
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.
Marvellion
ActiveSolanum lycopersicum L. · Tomato
Nunhems B.V., 6083 AB Nunhem
NL
6 records
Mirage
ActiveCucumis sativus L. · Cucumber
Syngenta, NL
NL
4 records
Martinique
ActiveSolanum lycopersicum L. · Tomato
MARTIJN VAN STEE
NL
7 records
Macapule
ActiveSolanum lycopersicum L. · Tomato
Martjin van Stee
NL
6 records
Maritimo
ActiveCucumis sativus L. · Cucumber
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
6 records
Marinice
ActiveSolanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
NL
6 records
Marejada
ActiveSolanum lycopersicum L. · Tomato
Vanesa Morales Montoya, Nunhems B.V.
NL
6 records
Landolino
ActiveSolanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
NL
6 records
Kybria
ActiveCucumis sativus L. · Cucumber
Rijk Zwaan Welver, D
NL
4 records
Logure
TerminatedSolanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
4 records
Kybele
ActiveCucumis sativus L. · Cucumber
Vilmorin SA (FR)
FR
5 records
Jungla
ActiveCucumis sativus L. · Cucumber
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
6 records
Jaguar
ActiveFestuca arundinacea Schreb. · Tall fescue
PURE SEED TESTING
FR
4 records
Hi Force
ActiveCucumis sativus L. · Cucumber
Nunhems B.V.
NL
8 records
Inspired
ActiveSolanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
NL
6 records
Harrier
ActiveLolium perenne L. · Perennial ryegrass
Seed Research of Oregon & Rutgers, The State University of New Jersey
CZ
4 records
Grandice
ActiveSolanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
NL
6 records
Halley
ActiveCucumis sativus L. · Cucumber
Seminis Vegetable Seeds
PL
5 records
Gerakl
ActiveCucumis sativus L. · Cucumber
RIJK ZWAAN ZAADTEELT EN ZAADHANDEL B.V.
NL
4 records
Fenda
ActiveSolanum lycopersicum L. · Tomato
HM.CLAUSE
FR
4 records
Euforia
ActiveSolanum lycopersicum L. · Tomato
Syngenta Seeds, NL
NL
4 records
Edu
ActiveSolanum lycopersicum L. · Tomato
Syngenta Seeds, NL
NL
6 records
Elpida
ActiveSolanum lycopersicum L. · Tomato
ENZA ZADEN BEHEER B.V.
NL
5 records