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.
Brassica napus var. napus · Rapeseed
Hodowla Roslin Strzelce Sp z.o.o. Grupa IHAR
Lactuca sativa L. · Lettuce
Nunhems B.V.
Solanum lycopersicum L. · Tomato
Yuksel Tohumculuk LTD
Cucurbita pepo L. · Field pumpkin
BEJO ZADEN
Capsicum annuum L. · Bell pepper
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Cucumis sativus L. · Cucumber
RIJK ZWAAN ZAADTEELT EN ZAADHANDEL B.V.
Cucumis sativus L. · Cucumber
SVS HOLLAND BV , NL
Lolium perenne L. · Perennial ryegrass
Innoseeds B.V.
Phaseolus vulgaris L. · Common bean
Blumen Group S.p.A. (IT)
Zea mays L. subsp. mays (Sweet Corn Group) · Sweet corn
Harris Morran, USA
Solanum lycopersicum L. · Tomato
Nunhems B.V., 6083 AB Nunhem
Lactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Cucumis sativus L. · Cucumber
Syngenta, NL
Lactuca sativa L. · Lettuce
Vilmorin-Mikado S.A.S.
Solanum lycopersicum L. · Tomato
Syngenta, NL
Capsicum annuum L. · Bell pepper
Enza Zaden Beheer B.V.
Lactuca sativa L. · Lettuce
Victor Carl Heintzberger, John Carl Heintzberger
Solanum lycopersicum L. · Tomato
MARTIJN VAN STEE
Lactuca sativa L. · Lettuce
Syngenta Seeds B.V.
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Capsicum annuum L. · Bell pepper
Orosco KFT, H
Phaseolus vulgaris L. · Common bean
OLTER SRL
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Capsicum annuum L. · Bell pepper
Enza Zaden Beheer B.V.