Diseases
Viral mosaic diseases are a group of systemic infectious plant diseases manifesting in variegated leaf coloration, tissue deformation, and reduced productivity. These diseases are caused by various pathogens, spread by pests and through contact, and are virtually untreatable.
Mentioned in descriptions 22 022 varieties reference book.
Viral mosaic diseases are characterized by the appearance of alternating spots of different colors on plant organs, including light rings, star-shaped spots, or stripes. In addition to specific variegated coloration, affected plants often exhibit leaf blade curling, wrinkling, and crinkling, as well as stunted overall growth and deformation of fruits and flowers. Sometimes the infection is latent, where visual symptoms are absent, yet crop productivity is significantly reduced.
Pathogen dissemination occurs through vectors such as aphids, true bugs, mites, and nematodes, as well as through mechanical transfer of sap from diseased plants during care, pruning, or physical contact. Infection is possible via seeds, planting material, soil, and crop residues. The intensity of infection development depends on weather conditions, particularly temperature regimes, and crop density, which facilitates rapid virus transmission.
Varietal resistance to mosaics is determined by the presence of specific or recessive genes affecting translation initiation. During breeding and variety testing, resistance is evaluated under artificial inoculation on infectious disease plots. Modern diagnostics for controlling viral load include enzyme-linked immunosorbent assay (ELISA) and polymerase chain reaction (PCR), while field resistance is determined by a variety's ability to not accumulate the pathogen throughout the growing season.
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.
Lactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Triticum aestivum L. · Bread wheat
CREA-CENTRO DI RICERCA INGEGNERIA E TRASFORMAZIONI AGROALIMENTARI (CREA-IT-RM)
Phaseolus vulgaris L. · Common bean
Harris Moran Seed Company (USA) (US)
Cucumis sativus L. · Cucumber
SYNGENTA SEEDS B.V , NL
Cucumis sativus L. · Cucumber
Enza Zaden, NL
Phaseolus vulgaris L. · Common bean
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Lactuca sativa L. · Lettuce
Enza Zaden Beheer
Lactuca sativa L. · Lettuce
Enza Zaden Beheer B.V.
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.
Cucurbita pepo L. · Field pumpkin
Syngenta Seeds B.V.
Capsicum annuum L. · Bell pepper
Paul Degreef
Solanum lycopersicum L. · Tomato
Sakata Seed Corporation, JP
Phaseolus vulgaris L. · Common bean
HOLLAND SELECT
Capsicum annuum L. · Bell pepper
SEMILLAS FITO, S.A.
Lactuca sativa L. · Lettuce
Enza Zaden Beheer B.V. / Enza Zaden Beheer B.V.
Lactuca sativa L. · Lettuce
Syngenta Crop Protection AG
Lactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Enza Zaden Beheer B.V.
Capsicum annuum L. · Bell pepper
Monsanto Vegetable IP Management B.V.
Lactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Solanum lycopersicum L. · Tomato
Bayer Holland B.V.
Phaseolus vulgaris L. · Common bean
FERRY MORSE
Pisum sativum L. · Pea
Syngenta Seeds B.V.
Triticum aestivum L. · Bread wheat
Peter Franck^^^Norbert Starck