Polystigma rubrum diffusion, intensity and disease dynamics at the territory of the Republic of Serbia [Yugoslavia]
1993
Stojanovic, S. (Institut za zastitu bilja i zivotnu sredinu, Beograd (Yugoslavia))
Polystigma rubrum (Per.) D.C. is very diffused plum parasite in Serbia (Yugoslavia). In all the localities in the 1986-1988 and 1990-1991 period, the appearance of this fungus was registered. During 1986 the plum orchards with the disease intensity of 20-50 prevailed. In 1987, in the most plum orchards, the intensity ranged from 20 to 40, and in 1988, 1990 and 1991 in the most localities it was 10. The insignificant increase of disease intensity was proved by investigating the disease growth during the vegetation, although the number of stroma per leaf did not increase significantly, which was the results of the enlargement of the existing stroma of Polystigma rumbrum, and not of new infections.
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