Abstract
The persistence and penetration into soilof surface-applied unformulated conidia of twoisolates of Metarhizium anisopliae and one of Beauveria bassiana at sites with clay, peat andtwo kinds of sand as their soil types and at depthsof from 0 to 20 cm was studied in 1988–1991 underconditions characterized by permanent snow cover andfrozen soil in the winter time. At 0–5 cm depth, M. anisopliae persisted throughout the experiment atall sites, clay being the most and peat the leastfavourable soil for persistence. Clay and one of thesandy soils were the least and peat the most conducivesoil to penetration of M. anisopliae from thesurface to deeper soil layers and persistence therein.Differences in persistence were evident between thetwo M. anisopliae isolates in the sandy and peatsites, but not in the clay site. Three yearspost‐application there were still enough infectiouspropagules of M. anisopliae in soil of allsites to infect over 80% of the Tenebriomolitor larvae used as baits in samples taken fromthe cylinders of all soils. All the augmentedpropagules of B. bassiana disappeared duringthe first winter after application in clay and one ofthe two sandy sites, but some persistence one yearpost‐inoculation was evident at 0–5 depth in one ofthe sand soils and at 0–5 and 5–10 cm depths in peat.
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Vänninen, I., Tyni-Juslin, J. & Hokkanen, H. Persistence of augmented Metarhiziumanisopliae and Beauveria bassiana in Finnishagricultural soils. BioControl 45, 201–222 (2000). https://doi.org/10.1023/A:1009998919531
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DOI: https://doi.org/10.1023/A:1009998919531