Lettucebig-vein disease (LBVD) is an important disease of lettuce (Lactuca sativa L.) worldwide, which was found in 2014 in Saudi Arabia (AL-Saleh et al. 2015). LBVD is associated with a complex of two viruses, lettucebig-vein associated virus (LBVaV) and Mirafiori lettuce... The finding of a second soil-borne virus in lettuce, Mirafiori lettucevirus (MiLV), led to a re-investigation of the role of LBVV in big-vein disease, with evidence emerging that both MiLV and LBVV are vectored by O. brassicae, and that MiLV, not LBVV, is the cause of BV (Lot et al. Mirafiori lettucebigveinvirus (MiLBVV) and lettucebigvein associated virus (LBVaV) were found in association with bigvein disease of lettuce in Iran. Analysis of part of the coat protein (CP) gene of Iranian isolates of LBVaV showed 97.1–100 % nucleotide sequence identity with other... Mirafiori lettucebig-veinvirus (MLBVV) and Lettucebig-vein associated virus (LBVaV) are found in association with big-vein disease of lettuce. Discrimination between the two viruses is critical for elucidating the etiology of big-vein disease. Lettucebig-vein disease (LBVD) is an economically damaging disease that occurs in most lettuce production areas worldwide. Several studies have associated LBVD with a complex of two viruses, Lettucebig-vein associated virus (LBVaV) and Mirafiori let-tucebig-veinvirus (MiLBVV). Bigveinlettucevirus is a viral disease. Both Mirafiori LettuceBigVeinVirus (MLBVV) and LettuceBigVein Associate Virus (LBVaV) are associated with bigvein infected lettuce plants, but only MLBVV has been identified as a causal agent. Lettuce varieties resistant to big-veinvirus are available. If so much of the farm is infected that crop rotation does not work, it makes sense to plant one of these varieties. Tipburn Tipburn is a calcium deficiency that causes burning of the leaf edges, especially the younger leaves. Abstract. The lettucebig-veinvirus (BVV) was recovered from 2 of 23 lettuce plants (Lactuca sativa L.) and 2 of 24 sow thistle (Sonchus oleraceus L.) plants sampled in 1962 and 1963 in areas of the lower Sacramento Valley where lettuce had not previously been grown. LettuceBigVeinVirus is transmitted by a fungus which inhabits the roots. Virus infection causes tissues next to veins to become clear, resulting in an enlarged appearance of the veins. The bigveinviruslettuce Mirafiori lettucebigveinvirus (MLBVV) (formerly Mirafiori lettucevirus MiLV) was reported for the first time in California on lettuce. Since then, its presence has been recognized in some twenty countries. Lettucebig-veinvirus (LBVV) is the type species of the genus Varicosavirus and is a two-segmented negative-sense single-stranded RNA virus. The larger LBVV genome segment (RNA1) consists of 6797 nt and encodes an L polymerase that resembles that of rhabdoviruses. Preferred name: lettucebig-veinvirus. Other scientific names.lettucebig-vein associated varicosavirus. Several studies have associated LBVD with a complex of two viruses, Lettucebig-vein associated virus (LBVaV) and Mirafiori lettucebig-veinvirus (MiLBVV). Both viruses are transmitted through soil by the zoospores of the chytridiomycete fungus Olpidium virulentus. Symptomology includes vein-band chlorosis, stunted growth, crinkled leaves, and absence of heads ( 1 ). LBVD is associated with two unrelated negative-stranded RNA viruses, lettucebigvein associated virus (LBVaV) and Mirafiori lettucebigveinvirus (MiLBVV) ( 2 – 4 ).
