Abstract
Grapevine leafroll-associated virus 3 (GLRaV-3) is an economically significant virus of grapevines, with secondary spread mediated by several species of mealybug and soft scale insects. To better understand virus-vector interactions, sensitive virus detection in these insects is a key tool. In this research, two new hydrolysis-probe-based real-time assays for GLRaV-3 detection were developed and compared to three existing assays. Of the five assays compared, the one-step RT-qPCR probe-based assay was the most sensitive and reliable, with as few as 10 virus RNA copies detected. This is the first description of a real-time molecular assay for virus detection in mealybugs with such sensitivity.
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