Evaluation of susceptibility of different pear hybrid populations to fire blight (Erwinia amylovora)

Evrenosoğlu Y., Mısırlı A. , Saygılı H., Bilen E., Boztepe Ö., Acarsoy Bilgin N.

Notulae Botanicae Horti Agrobotanici Cluj-Napoca, vol.39, no.1, pp.226-236, 2011 (Journal Indexed in SCI Expanded)

  • Publication Type: Article / Article
  • Volume: 39 Issue: 1
  • Publication Date: 2011
  • Doi Number: 10.15835/nbha3915619
  • Title of Journal : Notulae Botanicae Horti Agrobotanici Cluj-Napoca
  • Page Numbers: pp.226-236


Fire blight disease caused by pathogenic bacterium
Erwinia amylovora
, is the serious disease of pear, and there is not a certain
chemical management against this disease except antibiotic-type compounds such as streptomycin. It is very important to improve new
fire blight resistant cultivars in case of integrated disease management. With this purpose, different crosses have been made between
varieties that have good fruit characteristics and resistant cultigens. Besides, self and open pollination treatments have been
carried out in maternal plants. The disease resistance level of the hybrids obtained from these combinations was determined by artificial
inoculations by
Erwinia amylovora
in greenhouse conditions. A total of 3284 hybrids were inoculated, and 2631 of them survived and
were distributed to different susceptibility classes. 19.88% of the inoculated hybrids was killed by
Erwinia amylovora
. Total distribution
of the hybrids to susceptibility classes was as 6.18% in class “A- slightly susceptible”, 3.11% in class “B- less susceptible”, 8.89% in class
“C- mid-susceptible”, 20.28% in class “D- susceptible”, and 61.54% in class “E- very susceptible”. Majority of class “A- slightly susceptible”
hybrids were obtained from ‘Magness’ x ‘Ankara’ combination. ‘Kieffer’ x ‘Santa Maria’, ‘Kieffer’ open pollination, ‘Magness’ x ‘Akça’,
‘Magness’ x ‘Kieffer’, ‘Magness’ x ‘Santa Maria’, ‘Mustafa Bey’ x ‘Moonglow’ treatments displayed good results with respect to “A- slightly
susceptible” character. It is very important to evaluate these hybrid pear populations through different fruit and tree characteristics in
the future.