Das Verhalten einiger pilzlicher Antagonisten in der Rhizosphäre resistenter und anfälliger Gewächshaustomaten

Action of some fungal antagonists in the rhizosphere of resistant and susceptible tomato plants in the greenhouse The quantitative presence of the rhizospheric mycoflora fungi: Aspergillus alutaceus, Paecilomyces lilacinus, Penicillium herquei, P. nigricans and Trichoderma viride known for its antagonistic action to many pathogens is essentially differentiated in the two cultivars – the sensitive ‘Early pack’ and the resistant to tracheomycosis ‘GC 204′. It seems that the presence of the cultivar ‘GC 204’ favours the growth of these fungi. The first establishment of the fungi Penicillium chrysogenum and P. funiculosum, which are isolated from both cultivars, in the ‘Early pack’ rhizosphere might facilitate the colonization of this zone by the above mentioned antagonist which is not favoured by the sensitive cultivar. Such a changein the rhizospheric mycoflora of the sensitive cultivar may introduce some resistant to soil borne fungi diseases and open new perspectives of the biological control of these diseases.