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Warning: The information in this archived item was not confirmed with the appropriate National Plant Protection Organization and is provided solely for informational purposes. Please use this information with caution.

Subject: New sub-tropical distribution and etiology of Lettuce big-vein disease
Date posted: July 03, 2003
Source: Promed
Lettuce big-vein disease (LBVD) was reported for the first time in the sub-tropical area of Brazil (Sao Paulo State) and was associated with Mirafiori lettuce virus (MiLV). Previously Lettuce big-vein virus (LBVV) was considered the causal agent for LBVD with a distribution limited to temperate climates. Both MiLV and LBVV share the same chytrid fungal vector, Olpidium brassicae, and have recently been found together in lettuce samples in Europe, the United States, and Japan. With these mixed infections the presence or absence of LBVV appears to have little effect on symptom development. Typical symptoms of LBVD include: vein clearing, uneven leaf growth, and delayed maturity.

For the full story go to:
Archive No. 20030614.1462

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