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The experiments were carried out with peach (Prunus persica L. Batch) and apple (Malus hupehensis Rehd.) seedlings planted in pots. The soils were collected from peach and apple nursery, respectively. Non inoculated seedlings grew poorly in autoclaved, formaldehyde and ozone treated, or unsterilized soils. Plants inoculated with Glomus spp. produced excellent growth in these treated soils. All mycorrhizal plants had a greater dry weight than non mycorrhizal plants.