Effects of preplant inoculation of apple (Malus domestica Borkh.) with arbuscular mycorrhizal fungi on population growth of the root-lesion nematode, Pratylenchus penetrans

摘要: Six species of arbuscular mycorrhizal (AM) fungi (Glomus aggregatum, G. clarum, etunicatum, intraradices, mosseae and versiforme) were evaluated, in three greenhouse experiments, for their effects on reproduction the root-lesion nematode, Pratylenchus penetrans, growth Ottawa 3 apple rootstock. Glomus increased total dry weights nematode-inoculated non-inoculated rootstock all intraradices two experiments. Plants inoculated with generally supported fewer P. penetrans per gram root than plants other AM fungi, but did not differ significantly from controls any experiment. Colonization roots by was reduced at initial inoculum densities greater 250 nematodes/L soil. In field trials, preplant inoculation either or leaf concentrations P, Mg, Zn Cu fumigated plots non-fumigated plots, indicating that colonization native may have been sufficient adequate nutrient acquisition. The abundance vesicles arbuscules before planting plants, both plots. 50 ml soil lower mosseae-