Laboratory bioassays and field-cage trials of Metarhizium spp. isolates with field-collected Mormon crickets (Anabrus simplex)

被引:0
作者
Chad A. Keyser
Éverton K. K. Fernandes
Drauzio E. N. Rangel
R. Nelson Foster
Larry E. Jech
K. Chris Reuter
Lonnie R. Black
Stefan Jaronski
Darl D. Flake
Edward W. Evans
Donald W. Roberts
机构
[1] Utah State University,Department of Biology
[2] Universidade Federal de Goiás,Instituto de Patologia Tropical e Saúde Pública
[3] USDA APHIS PPQ CPHST,Pest Management Research Unit
[4] USDA ARS NPARL,Department of Mathematics and Statistics
[5] Utah State University,undefined
来源
BioControl | 2017年 / 62卷
关键词
spp.; Orthopteran; Virulence; Biological control; Mormon cricket;
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摘要
The Mormon cricket (MC) is an important pest in the western United States. This study evaluated the virulence in the laboratory of 32 isolates of Metarhizium spp. towards field-collected MCs. Additionally, four isolates were tested in outdoor field-cage studies. All 32 Metarhizium isolates were pathogenic towards the MC (could induce some mortality in the laboratory), including four isolates of the grasshopper-specialist species M. acridum. Virulence varied considerably among the isolates. Field studies, conducted in 2008–2009, showed a statistically significant effect of fungal treatments in both years. Pairwise comparison of the survival curves, however, revealed that, in 2008, three of the isolates did not differ statistically from the non-fungus control treatment. In 2009, all three of the isolates tested had significantly lower survival rates than the control treatment: MCs exposed to M. robertsii isolate DWR 346 had the lowest survival with a LT50 of 16 days. We hypothesize that the poor field performance resulted from a combination of negative environmental effects and isolate selection, and propose that further field studies with additional isolates are needed to identify an efficacious fungal agent for MC biocontrol.
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页码:257 / 268
页数:11
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