Enza Zaden Issues Terminology Update on Lettuce Mosaic Virus Resistance
The Eazyleaf® lettuce variety. | Enza Zaden
As part of an industry-wide harmonization effort coordinated through Euroseeds and aligned with the International Seed Federation (ISF), the terminology used to communicate resistance to Lettuce Mosaic Virus (LMV) in lettuce has been updated by Enza Zaden. As a result of this harmonization, varieties previously carrying the resistance designation LMV:1 will now be communicated as LMV:2.
What is Changing with Lettuce Mosaic Virus Terminology?
This change relates solely to the way LMV resistance is described and communicated.
Historically, many lettuce varieties were marketed with the resistance claim LMV:1. Following a review of resistance classifications, the European seed sector agreed to align its terminology with the ISF differential set. Under this harmonized approach, the common type of LMV isolates for which resistance claims are made is now designated as Race 2 (LMV:2).
As a consequence, resistance claims previously communicated as LMV:1 will gradually be updated to LMV:2 across product information, catalogues, technical sheets, labels, and other materials.
What Does This Change Mean for Growers?
Importantly, nothing changes in the genetics or performance of the lettuce varieties themselves.
This update does NOT indicate:
- A new resistance source
- A change in the effectiveness of the resistance
- A modification of the variety’s genetic makeup
- Any change in how the variety performs in the field.
The update is intended to improve consistency and transparency in resistance communication across the vegetable seed industry.
For additional information on the LMV terminology change, click here. Enza Zaden’s current global lettuce portfolio can also be viewed here.