Location: Crop Improvement and Protection ResearchTitle: Lettuce dieback: New virus found to be associated with soilborne disease in lettuce
Submitted to: Progressive Crop Consultant
Publication Type: Trade Journal
Publication Acceptance Date: 7/2/2020
Publication Date: 7/15/2020
Citation: Wintermantel, W.M. 2020. Lettuce dieback: New virus found to be associated with soilborne disease in lettuce. Progressive Crop Consultant. 5(4):30-31.
Technical Abstract: Lettuce dieback causes necrosis, stunting and death of lettuce plants throughout all western lettuce production regions in California and Arizona. The disease was traditionally known to be caused by either of two viruses from the genus Tombusvirus; Tomato bushy stunt virus (TBSV) and Moroccan pepper virus (MPV, formerly known as lettuce necrotic stunt virus), but these viruses are not present in all infected plants. High throughput sequencing identified a novel virus distantly related to a virus found in watermelon from China. The genome of the virus was fully sequenced and detection methods developed. The new virus, tentatively named lettuce dieback associated virus (LDaV), is present in nearly all associations between the presence of LDaV and lettuce dieback disease symptoms and lack of association with healthy lettuce. Studies are in progress to confirm that LDaV causes lettuce dieback disease when inoculated to lettuce, and to determine whether LDaV is controlled by the resistance gene that prevents development of lettuce dieback disease.