Effect of Inoculum Type and Inoculation Dose on Ectomycorrhizal Development, Root Necrosis and Growth of Douglas fir Seedlings Inoculated with Laccaria laccata in a Nursery

1988

S. 301-310

1 Abb., 1 Tab., 16 Lit. Ang.

Unselbständiges Werk

200014551

A fumigated nursery bed on a sandy loam was inoculated with the ectomycorrhizal fungus Laccaria laccata and seeded with Douglas fir. Twotypes of inoculum were compared: mycelium grown in a vermiculite/peat mixture, and mycelium grown in liquid medium and entrapped in a calcium alginate gel wi th different quantities of mycelium. At the end of the first growing season, the alginate inoculum at the dose of 5 g mycelium (dry weight) per m2 proved to be the most efficient. The top dry weight of the seedlings in this treatment was2.3 fold that of the non-inoculated fumigated controls. This inoculation treat ment also ensured nearly total mycorrhizal infection by L. laccata and reduced root necrosis caused by fungal pathogens.