Determination of antagonistic efficiencies of apple phyllosphere micoflora aganist apple scab agent, Venturia inaequalis (Cke.) wint

ABSTRACT MSc THESIS DETERMINATION OF ANTAGONISTIC EFFICIENCIES OF APPLE PHYLLOSPHERE MICOFLORA AGAINST APPLE SCAB AGENT, Venturia inaequalis (Cke.) Wint. H. Handan (MİMTAŞ) ALTINOK DEPARTMENT OF PLANT PROTECTION INSTITUTE OF NATURAL AND APPLIED SCIENCES UNIVERSITY of ÇUKUROVA Supervisor :Assoc. Prof. Dr. Ali ERKILIÇ Year: 2000, Page: 55 Jury :Assoc. Prof. Dr. Ali ERKILIÇ :Prof. Dr. N. Kemal KOÇ : Assist. Prof. Dr. Akif ESKALEN In this study, 43 different fungus species or isolats which have various suscebility against apple scab pathogen, Venturia inaequalis (Cke.) Wint. have been determined after 5 periodical isolations from leaves of Granny Smith, Starkspur Golden and Starkrimson apple species. Cryptococcus (white yeast), Sporobolomyces (pink yeast), Alternaria, Penicillium, Cladosporium, Epicoccum, Heterosporium, Papularia, Peyronellaea andPapularia fungal species have been determined on apple phyllosphere. It is observed that Aurebasidium and Cryptococcus species are the major part, of all fungus population for each of three apple species, after calculation of fungal population on 1 cm2 by suspensing leaf surface microorganisms in water. In. In vitro studies, Cryptococcus (A21), Sporobolomyces (A3), Penicillium (A8, All) and Papularia (Al) species are determined best fungus isolats to inhibit mycelial development of V. inaequalis, with various antagonistic methods. Results of dual culture studies shown that volatile antibiotics produced by Cryptococcus, Sporobolomyces, Alternaria altenata, Papularia and Epicoccum species have better efficiency compared to other isolats by 100% inhibiting mycelial development of V. inaequalis. KeyWords: Venturia inaequalis, Mycoflora, Fungal Antagonism, Apple, Dual Culture n