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Zum Auftreten von Phoma nigrificans (P. Karst.) comb. nov. (Teleomorph Didymella macropodii Petrak) an Winterraps ( Brassica napus L. var. oleifera Metzger)
Author(s) -
Boerema G. H.,
Loerakker W. M.,
Wittern I.
Publication year - 1986
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1986.tb00884.x
Subject(s) - phoma , leptosphaeria maculans , biology , botany , blackleg , conidium , brassica
Abstract On the occurrence of Phoma nigrificans (P. Karst.) comb. nov. (teleomorph Didymella macropodii Petrak) on winterrape ( Brassica napus L. var. oleifera Metzger) With a screening for resistence of winterrape to Phoma lingam (teleomorph Leptosphaeria maculans ), in various places in North Germany, another species of Phoma was repeatedly isolated from plants with blackleg symptoms. This Phoma species could easily be distinguished from P. lingam by its larger conidia and its lower optimal temperature. Comparative study with isolates in the Phoma ‐collection of the “Plantenziektenkundige Dienst” (Wageningen) showed that it, represents the anamorph of Didymella macropodii , an Eurasian Ascomycete occurring on different wild crucifers and originally described from Macropodium nivale in Siberia. The Phoma ‐anamorph of this fungus was first described in Finl, and from Armoracia rusticana as Sphaeronaema nigrificans. This binomial is now transferred to Phoma (“section Sclerophomella ”). Inoculation of rape seedlings with Phoma nigrificans ( Didymella macropodii ) resulted, in dark discolorations and constrictions of the hypocotyls of the seedlings.