At present stills is lacking the general theory capable to explain the essence of factors determining the nature of relationships between the parasitic organisms and higher plants. This is associated with the crisis of the dominant theoretical system which suggests that plants possess active protective reactions to definite species and races of parasites having developed in the process of the evolution. Heuristic analysis of various conceptions and hypotheses has shown that the general theory of parasite resistance of plants can be based only on the ecological conception of parasitism and V. P. Efroimson's theory of uncomplete medium.

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parasite resistance ecological conception uncomplete parasitism

U R, Riispere,.[Certain theoretical and methodological problems of phytoparasitology].. 11 (3),193-201.

U R, Riispere,"[Certain theoretical and methodological problems of phytoparasitology]." 11

U R, Riispere,"[Certain theoretical and methodological problems of phytoparasitology]."