Identification of resistance to azalea lace bug among deciduous azalea taxa.

摘要

The susceptibility of 17 deciduous species or cultivars and 1 evergreen cultivar of azalea (Rhododendron spp.) to azalea lace bug (Stephanitis pyrioides) was evaluated in the laboratory and in the field in Georgia, USA. R. canescens and R. periclymenoides were the most resistant species, followed by R. prunifolium. Ratings were based on oviposition rate, percentage emergence from the egg, feeding damage, and nymphal growth rate. The most susceptible genotypes were TNLV1, R. oblongifolium, R. alabamense, R. serrulatum, R. viscosum, Buttercup and My Mary. Leaf water content and leaf pubescence were significantly different among taxa. However, leaf water content was not significantly correlated with azalea lace bug performance, and insufficient evidence was available to conclude that leaf pubescence was involved in resistance.