Abstract
Health state of <em>Rhus typhina</em> was evaluated in 59 localities and 74 sites over the years 2001-2003 with scope (1) to identify the parasitic mycoflora of <em>R. typhina</em> in Slovakia and (2) to identify the occurrence of <em>Cryphonectria parasitica</em>, declared as an quarantine pest by the EPPO, besides the chestnut (<em>Castanea sativa</em> Mill.) and oak (<em>Quercus</em> sp.) also on <em>R. typhina</em>. The fungus <em>Botryosphaeria ribis</em> (Gross.) Dugg. (pycnidial state <em>Dothiorella mali</em> (Ell.) Ev) caused damage to the <em>R. typhina</em>. Damage to <em>R. typhina</em> caused by <em>B. ribis</em> was only recorded in 15 localities. Mean growth rate of hyphae of the fungus ranged from 25.7 to 48.3 mm after 96 hours of cultivation. The most appropriate medium for cultivation was 3% potato dextrose agar. The occurrence of the fungus <em>Fusarium oxysporum</em> Schlecht and mainly of quarantine fungus <em>C. parasitica</em> has not been recorded in the evaluated sites.
Highlights
Dieback of the ornamental tree Rhus typhina L. in consequence of infection with the fungus Botryosphaeria ribisGross (Dugg.) pycnidium stateDothiorella mali (Ell.) Ev has been recorded in several localities in Slovakia
The fungus B. ribis was for the first time recorded in
Typhina from a total number of 445 evaluated in Slovakia were damaged by B. ribis
Summary
Dieback of the ornamental tree Rhus typhina L. in consequence of infection with the fungus Botryosphaeria ribisGross (Dugg.) (teleomorph) pycnidium state (anamorph)Dothiorella mali (Ell.) Ev has been recorded in several localities in Slovakia. Dieback of the ornamental tree Rhus typhina L. in consequence of infection with the fungus Botryosphaeria ribis. Gross (Dugg.) (teleomorph) pycnidium state (anamorph). Dothiorella mali (Ell.) Ev has been recorded in several localities in Slovakia. Dangerous pathogens of the R. typhina disease are the fungi Fusarium oxysporum Schlecht., B. ribis and Endothia parasitica syn. Barr in North America (Toole 1949; Bragonier 1949). The fungus F. oxysporum has caused damage with symptoms of drying branches to other host trees in North America and Great Britain. C. parasitica, the chestnut blight fungus, was found on R. typhina in USA (Peace 1962). R. typhina is one of the many hosts of C. parasitica (Stipes et al.1978). The fungus C. parasitica destroyed a whole plantation of R. typhina on which the plant was cultivated to obtain tannin (Pøíhoda 1999)
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