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Relationship between corky root disease and yield of crisphead lettuce


, : Relationship between corky root disease and yield of crisphead lettuce. Journal of the American Society for Horticultural Science 117(1): 54-58

The effects of corky root (CR) disease, caused by Rhizomonas suberifacienis(van Bruggen, Jochimsen, and Brown) on fresh and marketable weights of lettuce (Lactuca sativa L.) were assessed during the 1988 and 1989 cropping seasons in several commercial lettuce fields. The resistant crisphead cultivars Raleigh and South Bay and the susceptible cultivars Ithaca and Shawnee produced similar yields in fields either planted in lettuce for the first time or in continuous lettuce production for three cropping cycles. Average yields of the resistant cultivars, from two fields cropped for six cycles naturally infested with CR, ranged from 875 to 1062 g/head fresh weight and 674 to 907 g/head marketable weight. The average yields of the susceptible cultivars in these infested fields ranged from 419.8 to 668.7 g/head fresh weight (37% to 52% yield loss) and 317.5 to 488.2 g/head marketable weight (46% to 53% yield loss). CR severity ratings were highly negatively correlated with root dry matter accumulation and whole and marketable head weights of lettuce.

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Related references

Mou, B.Q.; Hayes, R.J.; Ryder, E.J., 2007: Crisphead lettuce breeding lines with resistance to corky root and Lettuce mosaic virus. Breeding lines were derived form crosses between crisphead lettuce cultivars Salinas 88 and Glacier. The F1 plants were backcrossed to Salinas 88 once, and the BC1F1 and BC1F2 generations were screened for resistance to Lettuce mosaic virus (LMV)....

Lucas, R.; Guzman, V., 1980: Corky root rot on crisphead lettuce. II. Greenhouse study on sterilized soil. Belle Glade AREC research report EV Florida University Agricultural Research and Education Center: 980 (1980-12)

Guzman, Vl, 1984: South Bay and Raleigh: two crisphead lettuce cultivars resistant to corky root rot for organic soils. Circular S Agricultural Experiment Stations Institute of Food and Agricultural Sciences University of Florida: (310) 1-8

Amin, K.S.; Sequeira, L., 1966: Role of certain soil factors in the etiology of corky root rot of Lettuce. Phytotoxic substances from decomposing Lettuce residues in relation to the etiology of corky root rot of Lettuce. Extracts from soils amended with lettuce residues inhibited germination, killed 6-day-old seedlings, and induced typical corky root in mature plants. One of the toxic components, active at 25 p.p.m. was identified as m-ethyl-aminobenzoic acid.

Ryder, E.; Waycott, W., 1994: Crisphead lettuce resistant to corky root: cultivars Glacier and Misty Day and 16 resistant breeding lines. HortScience: a ication of the American Society for Horticultural Science 29(4): 335-336

O'-Brien, R.; Van-Bruggen, A., 1992: Accuracy, precision and correlation of yield loss of disease severity scales for corky root of lettuce. A method for comparing disease severity scales using accuracy, precision, and correlation to yield loss was tested using disease assessment scales developed for corky root of lettuce. Two qualitative interval scales, a seven-level scale developed...

O'brien R.D.; Van Bruggen A.H.C., 1992: Accuracy precision and correlation to yield loss of disease severity scales for corky root of lettuce. A method for comparing disease severity scales using accuracy, precision, and correlation to yield loss was tested using disease assessment scales developed for corky root of lettuce. Two qualitative interval scales, a seven-level scale developed...

O'brien R.D.; Van Bruggen A.H.C., 1990: A comparison of discrete and continuous disease severity keys for accuracy precision and prediction of yield loss caused by corky root of lettuce. Phytopathology 80(10): 989

Van Bruggen A.H.C.; Rubatzky V.E., 1992: Use of transplants instead of direct seeding to reduce corky root severity and losses due to corky root in iceberg lettuce. Severity of corky root and reduction in fresh and dry weights of heads were lower in transplanted than in direct-seeded iceberg lettuce (Lactuca sativa) in microplots infested with Rhizomonas suberifaciens. Disease severity was also lower in trans...

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