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Univ. Delaware Rose Rosette progress report

henry_kuska
6 years ago


Title: Evaluation of rose germplasm for resistance to Rose rosette disease

Danielle Novick and Thomas A. Evans, University of Delaware, Newark, DE, U.S.A.

"Rose rosette disease (RRD) is a lethal disease of roses (Rosa spp.) caused by Rose rosette emaravirus and vectored by the eriophyid mite Phyllocoptes fructiphilus. It is one of the most devastating diseases of landscape roses, producing aesthetically disfiguring symptoms within months and eventually killing the plant. Unfortunately, there is no known resistance among commercial rose cultivars and the few rose species that have demonstrated resistance are not ideal candidates for introgression of resistance genes into commercially viable cultivars. This study hopes to identify rose genotypes that merit consideration as candidates in a breeding scheme for resistance to RRD. A total of 151 genotypes are being screened in an ongoing field trial at the University of Delaware in Newark, DE. In addition to high natural disease pressure, the field has received multiple augmentations since its establishment in May 2015. Augmentation consisted of using twist ties to affix symptomatic shoots of RRD-infected Rosa multiflora to actively growing shoot tips of target roses. The vector preferentially feeds on symptomatic tissue, so augmentation artificially enhanced vector populations. Any roses that developed symptoms were subsequently tested by RT-PCR to confirm the presence of RRV. Thus far 85 genotypes have been verified as susceptible to RRD. The study will continue through 2018 and any roses remaining symptom-free will be assayed to confirm the absence of viral replication."

http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO-107-7-S4.1

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