Reduction in fitness of female Asian longhorned beetle (Anoplophora glabripennis) infected with Metarhizium anisopliae |
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Authors: | Hajek Ann E Lund Jennifer Smith Michael T |
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Institution: | a Department of Entomology, Cornell University, Comstock Hall, Ithaca, NY 14853-2601, USA b USDA, Agricultural Research Service, Beneficial Insect Introduction Research Laboratory, Newark, Delaware 19713, USA |
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Abstract: | Bioassays were conducted to document the effects of Metarhizium anisopliae infection on adult female Asian longhorned beetle (Anoplophora glabripennis) reproduction before death and subsequent survival of offspring. The effect of infection on fecundity was evaluated for females already laying eggs and for newly eclosed females using M. anisopliae isolates ARSEF 7234 and 7711, respectively. Decreased longevity and oviposition compared with controls were observed in females that were already laying eggs when exposed to M. anisopliae ARSEF 7234. Newly eclosed females exposed to M. anisopliae ARSEF 7711 displayed shortened longevity (10.0 ± 0.7 days vs 74.3 ± 6.8 days for controls) and decreased oviposition (1.3 ± 0.7 eggs per ARSEF 7711-exposed female vs 97.2 ± 13.7 eggs per female for controls) compared with controls. Percentages of eggs that did not hatch were greater for both groups of fungal-treated females compared with controls and 60.0% of unhatched eggs contained signs of fungal infection. The percentage of larvae dying within 9 weeks of oviposition was higher for sexually mature females exposed to ARSEF 7234 compared with controls and >40% of dead larvae displayed signs of fungal infection. Thus, for both stages of females and both fungal isolates, fewer surviving larvae were produced after female fungal infection compared with controls. M. anisopliae infection affects female fitness by decreasing female longevity, by decreasing female oviposition before death and through horizontal transmission of M. anisopliae to offspring. |
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Keywords: | Asian longhorned beetle Anoplophora glabripennis Metarhizium anisopliae Reproduction Effect of infection on Entomopathogenic fungi Biological control Horizontal transmission Invasive species |
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