Agri-Analysis :: Grapevine Testing :: Seed Testing since 1981.

You are here: ATTENTION GROWERS: Agri-Analysis is the first laboratory to test for Grapevine Red Blotch Associated Virus (GRBaV). Please call us today at 1.800.506.9852 for more details.
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Testing for:
Lettuce Mosaic Virus Bacterial diseases Grapevine diseases Fungal diseases Seed Health Genetic Traits GMOs

Our New Location
930 Riverside Parkway, Suite #30
West Sacramento, CA 95605


Agri-Analysis LLC is a proud member of:

The Napa Valley Grape Growers Association

The California Seed Association

The American Phytopathological Society

Lettuce Mosaic Virus Testing

The ELISA assay method that is used to detect lettuce mosaic virus (LMV) developed by our laboratory is combined with a highly refined statistical analysis of the data. It is a very sensitive and specific test which can be routinely used to detect 1 infected seed in 30,000, as required in California counties where lettuce is grown commercially. We test both seed and leaf tissue for LMV.

SAMPLING: Please submit a sample of 3-4 oz (75-100gm), and include specific seedlot identification for the certificate. Our delivery address is:

Agri-Analysis LLC
930 Riverside Parkway, Suite #30
West Sacramento, CA 95605

Service options:

  • Regular (Samples are processed in the order of arrival)

  • Rush (Quaranteed 2nd-Day Delivery of Results)

  • NEW in 2008:  Speed-LMV : Results available the same day!

Statistical Evaluation of Lettuce Seed Lots

Lettuce seed lots which are received for evaluation by the standard 30,000 seed assay are subdivided into 60 samples (sublots) of approximately 500 seeds each. Research conducted at the University of California, Davis, and the University of Florida has previously shown that assaying sublots of this size maximizes both the sensitivity and efficiency of the assay. Each sublot is then analyzed by an Enzyme-Linked Immunosorbent Assay (ELISA) for the presence of LMV. Based on the results obtained from the assay of the 60 sublots, two rates are deduced:

Observed Rate of Infection: The number of LMV-infected seeds detected from the 30,000 seeds actually assayed.

Statistical Rate of Infection: An extrapolation of the Observed Rate of Infection which attempts to estimate the rate of infection in the entire seedlot.

Mosaic Symptoms on Lettuce

Young plants first show a slight leaf rolling, followed by light green to yellow mottling. Foliage has a yellowish color and plants are small or dwarfed. Symptoms vary according to type or variety of lettuce. The virus is seed-borne and overwinters in wild hosts and weeds. Infected seed is the most common source of infection. Once infected plants are present in the field, aphids will continue to spread the virus. There is no cure for mosaic once a plant is infected. The control is to use virus-free seed.

Soil Content Assays

If determination of soil content of the seedlot is needed, please submit a 100 gm sample, and include specific seedlot identification for the report. Our delivery address is:

Agri-Analysis LLC
930 Riverside Parkway, Suite #30
West Sacramento, CA 95605