Treatments of antagonists and commercial biological products to control blossom infections by Erwinia amylovora.

aktepe b. p., HORUZ S., AYSAN Y.

2nd INTERNATIONAL BALKAN AGRICULTURE CONGRESS, Tekirdağ, Turkey, 16 - 18 May 2017, pp.67

  • Publication Type: Conference Paper / Full Text
  • City: Tekirdağ
  • Country: Turkey
  • Page Numbers: pp.67
  • Erciyes University Affiliated: Yes


Fire blight is the most serious bacterial disease of rosaceous plants. Erwinia

amylovora, causes severe infections in blossoms. Since copper compounds are

phytotoxic at blooming stage and antibiotics are restricted in Turkey, investigation

of alternative control strategies is  important while plant trees are bloomed.

Biological control of fire blight using commercial biological products provides an

effective disease management on blooming period. In this study, the efficacy of

commercial biological products (Blossom Protect, Serenade Opti) and 99

individual antagonists (92 bacteria and seven yeasts) isolated from natural floras

of five district provinces (Adana, Amasya, Mersin, Osmaniye, and Siirt) in Turkey

during 2014 and 2015 were investigated for their antagonistic effects on blossom

infections by Erwinia amylovora  using apple blossom tests under semi  in vivo

conditions with three replicates. Antagonistic microorganisms suppressed disease

development among 8,33-58,33% on apple blossoms. The most effective

antagonistic bacterium suppressed pathogen development by 58,33%, even

though the efficacy of this antagonist was higher than streptomycin and tested

commercial biological products. However, while the disease pressure of another

antagonistic bacterium was similar to streptomycin and Blossom Protect

containing the fungus, Aureobasidium pullulans by 41,67%, Serenade Opti which

contains the antagonistic bacterium, Bacillus subtilis was 50% effective in

reducing disease development. According to results, 10 antagonists were

promising in fire blight disease control. These antagonists will be treated to

evaluate their ability of disease control on the apple orchard in spring of 2017 as

further studies. This study was financially supported with Project numbers FBA-

2016-5287 and FUI-2016-6563.