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Thrips (Order Thysanoptera) species are agriculturally important pests and vectors of plant disease. These tiny insects are commonly found in all life stages on imported commodities at the New Zealand border. Morphological identification of thrips is able to be performed on adults, but the identification keys for immature stages are inadequate and so DNA barcoding is regularly used for their identification. Here, we have generated cytochrome oxidase I (COI) DNA barcode data for 29 thrips species from 124 individuals, focusing on  Frankliniella occidentalis,  a dominant species intercepted at New Zealand border, followed by  F. panamensis ,  Thrips palmi  and  T. tabaci . In addition, a multiplex real-time PCR assay has been developed to target the four thrips species. This assay is intended to facilitate the identification of quarantine interceptions with greater accuracy and faster diagnostic turnaround times, regardless of the developmental stages of the thrips. The developed assay demonstrated a high level of specificity for all the four target species and could detect as few as 10 copies/µL of the target DNA. Linear responses and high correlation coefficients between the amount of DNA and  Cq  values for each species were also achieved. The method was successfully tested on single egg, larva and adult samples and proved to be applicable for all life stages of the four species. Overall, this study has shown that the developed assay is an effective biosecurity tool for rapid and reliable identification of the target thrips species.

new zealand entomologist

DNA Barcodes for thrips species and development of multiplex real-time PCR assay for  Frankliniella occidentalis  Pergande,  Frankliniella panamensis  Hood,  Thrips palmi  Karny and  Thrips tabaci  Lindeman (Thysanoptera: Thripidae)