Study of Fire blight disease using pathogenicity and streptomycin resistance diversity

Subject Areas : Plant Protection

Esfandiar Zohour Paralak ¹ ()

Received: 2011-02-06 Accepted : 2011-10-30 Published : 2010-11-22

Keywords:

Abstract :

Fire blight of pome friut trees caused by Erwinia amylovora (Burrill) Winslow et al., 1920 has become one of the most important diseases of pome fruits in Iran.Ninty five strains of bacteria were isolated from affected tissuses (leaves,branches, flowers and fruits).  All samples were compared according to the standard physiological, biochemical and pathogenicity tests. Sensitivity of  strains against some antibiotics such as streptomycin, oxytetracyclin and copper were determined.All strains produced  hypersensitive reaction to tobacco and geranium. All strains were the same in phenotypic characteristics.  Moreover, there was not any difference in disease severity  between different  strains. None of  strains tested were resistant to streptomycin, oxytetracyclin and copper. All strians had homogenous phenotypic characteristics and anyibiotics resistance, regardless of their original hosts or geographical areas. There was no chance of finding new species of E.pyrifoliae.

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