Search Results

You are looking at 1 - 10 of 351 items for :

  • All content x
Clear All
Free access

Yuefang Wang, Carol D. Robacker, and S. Kristine Braman

azalea lace bug colonies and plants in the field plots and G.D. Buntin (Dept. of Entomology), M. Van lersel, and J.G. Latimer (Dept. of Horticulture) for reviewing this manuscript. We also thank Yongfu Ge for his assistance with data analysis. The

Free access

Carolyn F. Scagel, Guihong Bi, Leslie H. Fuchigami, and Richard P. Regan

biomass, can be found in Bi et al. (2007) . Plants used in this experiment were an evergreen rhododendron ( Rhododendron ‘H-1 P.J.M.’, ARS #874) and deciduous azalea ( Rhododendron ‘Cannon's Double’, ARS #922) obtained from a commercial nursery as 1

Free access

Grant T. Kirker, Blair J. Sampson, Cecil T. Pounders, James M. Spiers, and David W. Boyd Jr

The azalea lace bug (ALB), Stephanitis pyrioides (Scott), is an economically important hemipteran pest on azalea and a serious problem to azalea production nurseries in the southeastern United States. Eggs overwinter in midribs of leaves and

Full access

Domenico Bertetti, M. Lodovica Gullino, and Angelo Garibaldi

conditions. In the Lake Maggiore area, the market for acid-loving plants is valued at 13 million euros per year. Azalea is the most popular species grown, accounting for 50% of total production. More than one million plants are sold each year ( Rabbogliatti

Free access

Bing Liu, Hong Zhou, Sha Cao, Yi-ping Xia, and Rajeev Arora

-leaved evergreens, one with olive ( Eris et al., 2007 ) and the other with a woody liana, Hedera helix ( Parker, 1962 ), however, the third study focused on red pine needles ( Pomeroy et al., 1970 ). Evergreen azaleas belong to the genus Rhododendron section

Free access

Yuefang Wang, Carol D. Robacker, and S.K. Braman

Azalea lace bug is the most serious pest of cultivated azalea. Though deciduous azaleas are generally considered to be more resistant to lace bug than are evergreen azaleas, some variation in resistance has been reported. The identification of the genetic and physiological basis of resistance is important to eventual development of resistant cultivars of both the deciduous and evergreen azaleas. The first step in this program is to evaluate a wide range of deciduous azaleas for level of resistance. Laboratory evaluations were conducted on nine species and two hybrid cultivars of deciduous azalea and a known susceptible cultivar of evergreen azalea, `Delaware Valley White'. Oviposition rate, rate of egg hatch, number of nymphs surviving, and percent damaged leaf area were evaluated for each of the tested genotypes. Results indicated a wide range of susceptibility, with R. canescens and R. periclymenoides plants highly resistant to infection, while R. atlanticum and R. viscosum were highly susceptible.

Free access

Ryan N. Contreras, Thomas G. Ranney, Susana R. Milla-Lewis, and G. Craig Yencho

with the Royal Horticulture Society (RHS), including 14,298 rhododendrons, 12,989 azaleas, and 108 azaleodendrons (intersubgeneric hybrids between azaleas and rhododendrons) ( Leslie, 2002 ). Thus, this genus is among the most extensively developed and

Free access

Warren E. Copes and Eugene K. Blythe

Azalea web blight, caused by certain binucleate species of Rhizoctonia , occurs yearly on some azalea cultivars during nursery production in the southern and eastern United States. Azalea shoots collected for stem cutting propagation can harbor the

Full access

Tongyin Li, Guihong Bi, Richard L. Harkess, and Eugene K. Blythe

of specific biocontainers on plant nutrient uptake require investigation. Therefore, the objective of this study was to investigate the influence of N rate, container type, and irrigation frequency on mineral nutrient uptake of Encore ® azalea

Free access

Michael C. Long, Stephen L. Krebs, and Stan C. Hokanson

), different disease symptoms are seen on deciduous azaleas (subgenus Pentanthera) and broad-leaved evergreen rhododendrons (subgenus Hymenanthes), and different causal organisms may be involved. Although three fungal genera ( Microsphaera , Sphaerotheca , and