In vitro Inoculation Studies for Estimating the Susceptibility of Ornamental Plants to Phytophthora ramorum
Kaminski, K. | Wagner, S.
Susceptibility evaluation of plant species towards Phytophthora ramorum is essential for pest risk assessment of the pathogen in Europe. An in vitro inoculation method on detached leaves and twigs was used to estimate the susceptibility of some leading ornamental plant species in Germany. Ratings in susceptibility of plant species and cultivars were classified according to the degree of symptoms caused by P. ramorum. Buxus sp., Hedera helix, Vaccinium corymbosum and V. macrocarpon were classified as not susceptible whereas most Calluna vulgaris cultivars, Erica carnea'Schneekuppe', E. gracilis, Vaccinium myrtillus and Vaccinium oxycoccus ranged in the 'highly susceptible' category. Erica carnea 'Rubinfeuer' and E. cinerea were classified as moderately susceptible whereas E. x darleyensis and Rhododendron simsii were classified as slightly susceptible. Different susceptibility reactions between cultivars were only found for R. simsii and C. vulgaris. Symptom development was effected by wounding only for R. simsii, V. corymbosum and V. oxycoccus.Show more [+] Less [-]