Seed Production Best Practices
What LMV Indexing Actually Means, and Why It Matters
Every commercial lettuce crop starts with a seed. And every seed can carry Lettuce Mosaic Virus. LMV is seed-transmitted, spreads rapidly via aphids, and can devastate a field before symptoms are obvious. The only way to know what you're planting is to test before it goes in the ground.
The Gold-Standard Test: DAS ELISA
The industry-standard detection method, validated by the International Seed Federation and approved by the US National Seed Health System as a Standard A method, is DAS ELISA (Double Antibody Sandwich Enzyme-Linked Immunosorbent Assay). It has been used commercially since 1990 and can detect a single infected seed in a sub-sample of 500, or one infected seedling in a group of 100.
Seeds or seedlings are ground in extraction buffer to release any viral particles, which are then captured by antibody-coated ELISA plates. A conjugated antiserum and substrate solution produce a measurable color change when LMV is present. Results are read by spectrophotometer against validated thresholds. It is precise, reproducible, and backed by decades of published research.
Clean Seed Is the Only Reliable Starting Point
For seed companies, a single positive in a lot means that lot cannot go to market. For breeders, contamination at the multiplication stage can set a program back years. The cost of rigorous indexing is nothing compared to the cost of a contaminated seed lot reaching a grower.
It is also worth noting that the DAS ELISA method is validated for untreated seed. Seed treated with protective chemicals or biological substances falls outside the validated scope, and any interference with the assay must be empirically determined by the user. This is one reason Bullseye Seeds focuses exclusively on clean, untreated production — it eliminates that variable entirely.
Why Bullseye Seeds Is Built Around It
Based in California's Central Valley with 35-plus years of production experience, Bullseye Seeds produces 100% LMV-indexed lettuce seed from fields specifically located to maintain isolation from mosaic sources and commercial tomato production. LMV indexing is not a post-production checkpoint here. It is the standard every lot is built toward from day one.
Ready to work with a partner who takes seed health seriously?
Whether you need LMV-indexed seed production, parent line increases, or a reliable R&D production partner, reach out to me at jerry@bullseyeseeds.com.
The Gold-Standard Test: DAS ELISA
The industry-standard detection method, validated by the International Seed Federation and approved by the US National Seed Health System as a Standard A method, is DAS ELISA (Double Antibody Sandwich Enzyme-Linked Immunosorbent Assay). It has been used commercially since 1990 and can detect a single infected seed in a sub-sample of 500, or one infected seedling in a group of 100.
Seeds or seedlings are ground in extraction buffer to release any viral particles, which are then captured by antibody-coated ELISA plates. A conjugated antiserum and substrate solution produce a measurable color change when LMV is present. Results are read by spectrophotometer against validated thresholds. It is precise, reproducible, and backed by decades of published research.
Clean Seed Is the Only Reliable Starting Point
For seed companies, a single positive in a lot means that lot cannot go to market. For breeders, contamination at the multiplication stage can set a program back years. The cost of rigorous indexing is nothing compared to the cost of a contaminated seed lot reaching a grower.
It is also worth noting that the DAS ELISA method is validated for untreated seed. Seed treated with protective chemicals or biological substances falls outside the validated scope, and any interference with the assay must be empirically determined by the user. This is one reason Bullseye Seeds focuses exclusively on clean, untreated production — it eliminates that variable entirely.
Why Bullseye Seeds Is Built Around It
Based in California's Central Valley with 35-plus years of production experience, Bullseye Seeds produces 100% LMV-indexed lettuce seed from fields specifically located to maintain isolation from mosaic sources and commercial tomato production. LMV indexing is not a post-production checkpoint here. It is the standard every lot is built toward from day one.
Ready to work with a partner who takes seed health seriously?
Whether you need LMV-indexed seed production, parent line increases, or a reliable R&D production partner, reach out to me at jerry@bullseyeseeds.com.
