If the virus is present at a high concentration in an infected vine, it can be reliably detected in a composite sample of up to ten vines. However, if a vine has recently become infected, the virus concentration may be much lower, and may not be detected in a large composite sample. The recommended sampling protocol for vineyard or nursery block surveys combines three shoot tips from each of five vines into one composite sample.
Verbal results are available within ten business days after receipt of samples.
A full written report follows within an additional three business days. We will also FAX or e-mail results upon request. If you have any questions about sample collection, or would prefer to have samples collected by us, please contact us .