What benefits of Laccaria laccata have been cited in the scientific literature?
On plant growth, the literature cites Laccaria laccata as producing the largest growth response among a tested panel of ectomycorrhizal fungi — including Descolea maculata isolates and Pisolithus tinctorius — in pot-grown Eucalyptus diversicolor seedlings. A separate study reports that a mixed inoculant of L. laccata, Suillus bovinus, and Lactarius deterrimus improved growth and nutrition of Pinus pinaster nursery seedlings without added chemical fertilizer.
Peer-reviewed research also documents biocontrol-adjacent activity: Laccaria laccata inhibited Trichoderma virens and T. harzianum in co-culture, with hyphae coiling around competing structures and causing measurable cell damage. It additionally suppressed Mucor hiemalis sporangiospore germination on mycorrhizal Pinus sylvestris roots, with mycoparasitic behavior observed in each case. These are reported laboratory findings, not approved label claims.
Finally, research on the Douglas fir (Pseudotsuga menziesii) — Laccaria laccata pairing shows that mycorrhization helper bacteria (MHBs) promote L. laccata mycorrhizal development and improve ectomycorrhizal inoculation success in forest nurseries, as cited in the literature.
1AAPFCO-accepted claims
Listing details- Beneficial to plants and/or soils.
Accepted wording, shown verbatim · source: AAPFCO Plant Biostimulant list
2Potential claims from the literature
Reported to form ectomycorrhizal associations with Allocasuarina littoralis, Casuarina equisetifolia, and C. cunninghamiana in aseptic in vitro synthesis systems
Reported to form ectomycorrhizal associations with Eucalyptus diversicolor (karri) seedlings
Reported to form ectomycorrhizal associations with Pinus sylvestris
Reported to produce the largest plant growth response among tested ectomycorrhizal fungi (Descolea maculata isolates, Pisolithus tinctorius, and Laccaria laccata) in pot-grown Eucalyptus diversicolor seedlings
Reported, as part of a mixture with Suillus bovinus and Lactarius deterrimus, to improve plant growth and nutrition of Pinus pinaster seedlings in nursery conditions without the need for chemical fertiliser
Reported to inhibit the growth of Trichoderma virens in co-culture, with mantle hyphae coiling around conidia and causing deformation and partial degradation of conidial walls on mycorrhizal Pinus sylvestris roots
Reported to inhibit the growth of Trichoderma harzianum hyphae in co-culture, with hyphae coiling around and sporadically penetrating T. harzianum hyphae, causing vacuolation, protoplasm granulation, and wall breaks
Reported to suppress germination of Mucor hiemalis sporangiospores on mycorrhizal Pinus sylvestris roots and to exhibit mycoparasitic behaviour including coiling around sporangiophores and degradation of M. hiemalis structures
Reported to be promoted in mycorrhizal development by mycorrhization helper bacteria (MHBs) in the Douglas fir (Pseudotsuga menziesii) – Laccaria laccata ectomycorrhizal combination, with MHBs shown to improve ectomycorrhizal inoculation success in forest nurseries
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