CULTURAL GROWTH-PATTERNS AND INCOMPATIBILITY REACTIONS IN DIAPORTHE AND PHOMOPSIS POPULATIONS

Comparative studies were carried out with cultures isolated from Phomo psis condiomata and/or Diaporthe ascomata found on naturally-infected living stems or on overwintered stem fragments of Arctium lappa L., He lianthus annuus L., Glycine max (L.) Merr., and Xanthium italicum More tti, growing in or nearby the same fields in Vojvodina. Results unders cored the heterogeneity of the Phomopsis anamorphs in the D. arctii (L asch) Trav. complex. Intra-specific vegetative incompatibility groups were distinguished among Phomopsis and/or Diaporthe populations from A . lappa. More than one phytopathogenic Phomopsis and/or Diaporthe spec ies were identified on X. italicum. P. longicolla Hobbs was isolated f or the first time in Yugoslavia from soybean stem debris. The holomorp h Diaporthe (Phomopsis) helianthi Muntanola-Cvetkovic, Mihaljcevic et Petrov showed distinguishing characteristics with respect to other con generic fungi.