Folia Horticulturae

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The study of new fungus species causing apple sooty blotch

Marek Grabowski

Department of Plant Protection
Faculty of Horticulture, Agricultural University in Kraków
29 Listopada 54, 31-425 Kraków, Poland

In southern Poland sooty blotch symptoms are caused by 8 fungus species and 3 fungus forms. In addition to Tripospermum myrti (Lind.) Hughes, Phialophora sessilis de Hoog and Peltaster fructicola (John.) Sutton et Hodges described previously, the occurrence of 5 new fungus species and 3 fungus forms was found. They are the cause of the occurence various sooty colored spots on the surface of apple fruit. The newly recognized species comprise the two belonging to Tripospermum (T. camelopardus (Ing.) Dann et Mc Dougall, T. acerinum Syd.). The next group includes 3 fungi recognized as sooty molds, among them the most common Aureobasidium pullulans (de Bary) Arnoud and Cladosporium cladosporioides (Fres.) de Vries and the rare Torula herbarum (Pers.) Link. These fungi grow on fruits in orchards where no honeydew insects are present. Very interesting and lesser-known groups were fungus isolates from genera Septoria, Ramularia and Pseudocercosporella. Psessilis occurred rarely and P. fructicola only exceptionally.

Grabowski M., 2007. The study of new fungus species causing apple sooty blotch. Folia Horticulturae 19/2: 89-97.