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The present investigation was aimed at analyzing the role of fumigants,  i.e ., different concentrations of carbon disulphide (CS 2 ) and formalin, on soil mycoflora including mycorrhizal fungi in the sunflower rhizosphere. Fungi were greatly reduced immediately after fumigant application but with the passage of time these started to reappear. In qualitative analyses of mycoflora,  Aspergillus niger, Aspergillus terreus  and  Penicillium nigricans  reappeared only after 20 days at all CS 2  concentrations. The quantitative study showed the boosting up of the population of  Trichoderma viride  with increasing concentrations of formalin and CS 2  after 20 days. High concentrations of both fumigants initially decreased mycorrhizal spore number. However, the mycorrhizal spore number increased later on. Mycorrhizal root colonization reached maximum after 40 days in treated soils.  Glomus mosseae  was resistant to CS 2  application but  Glomus geosporum  and  Acaulospora laevis  were inhibited by high concentrations of the fumigant.

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MYCOFLORA OF SUNFLOWER RHIZOSPHERE IN RELATION TO SOIL FUMIGATION / MICROFLORA DE LA RIZÓSFERA DE GIRASOL EN RELACIÓN A LA FUMIGACIÓN DEL SUELO / LA MYCOFLORE DE LA RHIZOSPHÈRE DU TOURNESOL EN RAPPORT AVEC LA FUMIGATION DU SOL