TY - JOUR ID - 32710 TI - Results of Screening on 89 Apple Cultivars for Fire Blight Resistance Using USDA System in Karaj Conditions JO - Journal of Iranian Plant Protection Research JA - JPP LA - en SN - 2980-8170 AU - Hajnajari, H. AD - Y1 - 2012 PY - 2012 VL - 26 IS - 3 SP - 261 EP - 268 KW - Apple cultivars KW - Erwinia amylovora KW - Fire blight KW - Native KW - Resistance DO - 10.22067/jpp.v26i3.15486 N2 - Fire blight disease caused by Erwinia amylovora is a destructive disease of pome fruits including apple worldwide. Use of resistant cultivars is the most efficient method of disease control. In the present research, we investigated genetic resistance of 89 local and imported commercial apple cultivars in natural contaminated conditions to the bacterial disease using Beltsville scoring system (USDA) in horticulture Research station of Kamalshahr, Karaj (Iran), during triennial observations, 2007-2009. Apple cultivars differed significantly (P UR - https://jpp.um.ac.ir/article_32710.html L1 - https://jpp.um.ac.ir/article_32710_f79f74a9e20121356d7cb0352a47024c.pdf ER -