Some viruses affecting insects of economic importance

Smith, Kenneth M.; Rivers, C. F.

doi:10.1017/s0031182000026470

Cited by 56 publications

(10 citation statements)

References 6 publications

(5 reference statements)

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“…The possibility that a GV from A. rapae might 'trigger' a latent GV in P. brassicae was considered as early as 1956 (Smith & Rivers, 1956). Our infections with heterologous GV isolates suggested that a latent genotype might be ArGV1, although restriction fragments in progeny from AsGV infection indicated that other ArGV genotypes might also be present in P. brassicae.…”

Section: Discussionmentioning

confidence: 99%

Characterization of new baculovirus genotypes arising from inoculation of Pieris brassicae with granulosis viruses

Smith¹,

Crook²

1993

Journal of General Virology

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Previous studies have shown that of 15 Artogeia (Pieris) rapae granulosis virus isolates (ArGV1 to ArGV15) only two, ArGV1 and ArGV2, gave a normal dose-mortality response in larvae from an established colony of Pieris brassicae. We report here that at extremely high doses, approaching 10000 times the LDs0 for ArGV1 and ArGV2, three other ArGV isolates caused low and irregular levels of mortality in P. brassicae. At similar doses Agrotis segetum GV caused 43 % mortality in one infection, but no deaths ensued from other inoculations with this virus. Restriction endonuclease analysis of viral DNA recovered from individual larval cadavers revealed that, in most cases, progeny virus differed from the inoculum and consisted either of ArGV1 or of novel genotypes explicable as recombinants between genomes of the inoculum and of ArGV1. Field-collected P. brassicae inoculated with ArGV8 yielded a similar range of progeny genotypes. Physical maps were constructed for two such recombinants, based on comparative restriction analysis with reference to the published map of ArGVl and to those of ArGV5 and ArGV8, which are presented. Replication of the inoculum genotype was observed in only two infections. The origin of ArGV1 DNA appearing among progeny from these infections and the relevance of our results to identifying ArGV DNA sequences that modulate pathogenicity for P. brassicae are discussed.

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Section: Discussionmentioning

confidence: 99%

Characterization of new baculovirus genotypes arising from inoculation of Pieris brassicae with granulosis viruses

Smith¹,

Crook²

1993

Journal of General Virology

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“…Virus particles associated with granuloses were first demonstrated by Bergold (1) and later by Steinhaus, Hughes, and Wasser (15), Hughes and Thonlpsoil (8), Tanada (16), Bergold (3), and Smith and Rivers (13). Each granule, with dimeilsions about 0.5 X0.15 p , usually contains one virus particle though occasionally two occur.…”

Section: Introductionmentioning

confidence: 98%

“…They poiilted out that "it is possible that some reports of granuloses which arise in the cytoplasm may have resulted from observations made after the i~lfectio~l had progressed too far to distinguish between ~lucleus and cytoplasm". Tanada (16), i\/Iartignoni (9), and Smith and Rivers (13), in investigatio~ls of granulosis diseases of Pieris rapae, Eucosnza griseana, and P . brassicae, respectively, all report the development of the viruses within the nuclei of susceptible cells.…”

Section: Introductionmentioning

confidence: 99%

Histopathology of Granulosis Viruses in Insects

Bird¹

1958

Can. J. Microbiol.

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A histopathological study of granulosis virus diseases of the spruce budworm, Choristonezira fumiferana Clem., the larch budworm, Eucosnta griseana Hbn.,and the imported cabbage worm, Pieris rapae Linn., has shown that the viruses may infect fat, hypodermal, tracheal matrix, and blood cells. The viruses multiply and develop within the cytoplasm of these cells appearing first as spheres and then as rods. Finally each rod becomes occluded by protein to form a "granule". 1bIanuscri~t received F e b r~~a r v 24. 1958. ~o n t r i b u f i o n No. 451, from fhe ~i v i s i o n

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“…In Ontario, a GV was found to be the key mortality factor in P. rapae populations (Harcourt, 1966) with the virus persisting in the soft in many parts of the country (Jacques & Harcourt, 1971). The virus disease was also found to be common in New Zealand (Kelsey, 1957), but in the United Kingdom it has been recorded on few occasions and only in late-instar larvae, by which time considerable crop damage may have occurred (Smith & Rivers, 1956 ;Dempster, 1967 ;Tatehell, 1981).…”

mentioning

confidence: 99%