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- W2048654225 abstract "► Spodoptera exigua adults (16.1%) RT-PCR positive for covert SeMNPV infection. ► Covert infection varied with sex and sample date. ► Lethal disease occurred in offspring of transcript-positive and negative females. ► Covertly infected insects more susceptible to infection than healthy insects. ► Horizontal transmitted isolates more pathogenic than vertical transmitted ones. The prevalence of sublethal infections of Spodoptera exigua multiple nucleopolyhedrovirus (SeMNPV) was quantified in natural populations of S. exigua in Almería, Spain, during 2006 and 2007. Of 1045 adults collected, 167 (16.1%) proved positive for viral polyhedrin gene transcripts by RT-PCR. The prevalence of covert infection varied significantly according to sex and sample date. Of 1660 progeny of field-collected insects, lethal disease was observed in 10–33% of offspring of transcript-positive females and 9–49% of offspring of transcript-negative females. Isolates associated with vertically transmitted infections were characterized by restriction endonuclease analysis using Bgl II or Eco RV and compared with isolates originating from greenhouse soil-substrate believed to be horizontally transmitted. Insects from a sublethally infected Almerian colony were between 2.3-fold and 4.6-fold more susceptible to infection than healthy insects from a Swiss colony, depending on isolate. Horizontally transmitted isolates were significantly more pathogenic than vertically transmitted isolates in insects from both colonies. Mean speed of kill in second instars (Swiss colony) varied between isolates by >20 h, whereas mean occlusion body (OB) production in fourth instars (Swiss colony) varied by 3.8-fold among isolates. Intriguingly, all three horizontally transmitted isolates were very similar in speed of kill and OB production, whereas all three vertically transmitted isolates differed significantly from one another in both variables, and also differed significantly from the group of horizontally transmitted isolates in speed of kill (one isolate) or both variables (two isolates). We conclude that key pathogenicity and virulence traits of SeMNPV isolates vary according to their principal transmission strategy." @default.
- W2048654225 created "2016-06-24" @default.
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- W2048654225 date "2011-02-01" @default.
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- W2048654225 title "Occlusion body pathogenicity, virulence and productivity traits vary with transmission strategy in a nucleopolyhedrovirus" @default.
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- W2048654225 doi "https://doi.org/10.1016/j.biocontrol.2010.10.007" @default.
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