Abstract
Spores of Glomus caledonium and Acaulospora laevis , which had been germinated in untreated or steamed field soil without plants, retained their capacity to infect plants for periods up to 4 months. Retention of infectivity was greater for A. laevis than G. caledonium in either soil. Decreased infectivity appeared to be due to the loss of the capacity of the hyphae to form pre-penetration and penetration structures. For equivalent amounts of inoculum (the same number of germinated spores that were similar in size), A. laevis had a greater capacity than G. caledonium to colonize roots. Germination of the spores of either species prior to sowing increased the extent of colonization of young roots.
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