Biocontrol Science and Technology (2012) 22, 1284-1304

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Mark A. Boetel, Ayanava Majumdar, Stefan T. Jaronski and Richard D. Horsley (2012)
Cover crop and conidia delivery system impacts on soil persistence of Metarhizium anisopliae (Hypocreales: Clavicipitaceae) in sugarbeet
Biocontrol Science and Technology 22 (11), 1284-1304
Abstract: The sugarbeet root maggot, Tetanops myopaeformis (Röder), is a major North American pest of sugarbeet, Beta vulgaris L. Previous research suggests that moderate T. myopaeformis control is possible with the entomopathogen Metarhizium anisopliae (Metch.) Sorok. We conducted a three-year (2002-2004) experiment to assess impacts of oat, Avena sativa L. and rye, Secale cereale L., cover crops on persistence of corn grit-based granular or spray formulations of M. anisopliae isolate ATCC 62176 (i.e. MA 1200) applied at 8×1012 viable conidia/ha in sugarbeet. More colony forming units (CFUs) were detected immediately after application [0 days after treatment (DAT)] in spray plots than granule-treated plots. However, 76-92% declines in CFUs per gram of soil occurred in spray plots within 30 DAT. Substantially (i.e. 83-560%) more rainfall occurred in June 2002 than during June of any other year. Subsequently, 71-670% increases in CFU concentrations occurred by 60 DAT in M. anisopliae granule-treated plots with oat or rye cover crops that year. CFU density increases were higher in cover crops in 2002, but no significant cover crop effects were detected. Conidia persisted for up to 30 DAT in M. anisopliae spray plots and 60 DAT in granule-treated plots in 2002; however, no increases occurred in the years with less June rainfall. Trends suggest that M. anisopliae aqueous sprays result in greater conidia concentrations than granules at sugarbeet plant bases in June during T. myopaeformis oviposition and larval establishment on host plants. Increases are possible when delivering conidia via granules, but high post-application rainfall could be necessary for conidia production.
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Database assignments for author(s): Mark A. Boetel, Richard D. Horsley

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
population dynamics/epizootiology
environment/habitat manipulation

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.
Tetanops myopaeformis Beet/sugarbeet (Beta vulgaris)
Metarhizium anisopliae (entomopathogen) Tetanops myopaeformis