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An epizootic of patent iridescent virus disease in multiple species of blackflies in Chiapas, Mexico

Tipo de material: Artículo impreso(a) Artículo impreso(a) Idioma: Inglés Tema(s) en español: Tema(s) en inglés: Clasificación:
  • AR/632.752 H4
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 En: Medical and Veterinary Entomology volumen 14, número 4 (December 2000), páginas 458-462Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso Resumen:
Inglés

Simulium black¯y larvae (Diptera: Simuliidae) were collected from rivers and streams at 500±1500ma.s.l. in Chiapas State of southern Mexico. Among 45 sites surveyed over an area of 2300 km2 (around 15°15¢N 92°20¢ W), some Simulium larvae from three sites were opalescent violet-blue, interpreted as patent infection with invertebrate iridescent virus (IIV). Dissection con®rmed the presence of putative Iridovirus particles, 130 nm diameter, but no IIV isolates were obtained from homogenates injected into Galleria mellonella (L) larvae (Lepidoptera: Pyralidae). All Simulium with patent IIV infection died before metamorphosis, whereas ~60% of asymptomatic Simulium survived to adulthood in the laboratory.

During 1997, standard monthly samples from two parallel rivers 42±50 km north-west of Tapachula comprised the following species proportions (and rates of patent IIV infection): 41.8% (47%) Simulium mexicanum Bellardi complex, 31.3% (31.4%) S. rubicundum Knab, 10.1% (13.1%) S. paynei, 6.5% (2.9%) S. callidum (Dyar & Shannon), 6.3% (5.1%) S. ochraceum Walker complex, 3.1% (0.7%) S. downsi Vargas et al., 0.7% S. samboni Jennings and 0.2% S. metallicum Bellardi complex, showing a strong correlation between black¯y abundance and the prevalence of patent infection. An epizootic of IIV in January and February (infection rates 41±100%) was followed by absence of larvae (March±August) until the end of the rainy season, when numbers collected on nylon strings rose to » 1/ cm with patent IIV infection rates of 0±12.5% during September±December. Further investigations are underway to isolate this IIV and assess its potential usefulness for biological control of Simulium pests and vectors of onchocerciasis.

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Artículos Biblioteca Electrónica Recursos en línea (RE) ECOSUR Recurso digital ECO400340346579
Artículos Biblioteca San Cristóbal Artículos (AR) ECOSUR AR 632.752 H4 001 Disponible ECO010004679
Artículos Biblioteca Tapachula Artículos (AR) ECOSUR AR 632.752 H4 001 Disponible ECO020006156

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Simulium black¯y larvae (Diptera: Simuliidae) were collected from rivers and streams at 500±1500ma.s.l. in Chiapas State of southern Mexico. Among 45 sites surveyed over an area of 2300 km2 (around 15°15¢N 92°20¢ W), some Simulium larvae from three sites were opalescent violet-blue, interpreted as patent infection with invertebrate iridescent virus (IIV). Dissection con®rmed the presence of putative Iridovirus particles, 130 nm diameter, but no IIV isolates were obtained from homogenates injected into Galleria mellonella (L) larvae (Lepidoptera: Pyralidae). All Simulium with patent IIV infection died before metamorphosis, whereas ~60% of asymptomatic Simulium survived to adulthood in the laboratory. Inglés

During 1997, standard monthly samples from two parallel rivers 42±50 km north-west of Tapachula comprised the following species proportions (and rates of patent IIV infection): 41.8% (47%) Simulium mexicanum Bellardi complex, 31.3% (31.4%) S. rubicundum Knab, 10.1% (13.1%) S. paynei, 6.5% (2.9%) S. callidum (Dyar & Shannon), 6.3% (5.1%) S. ochraceum Walker complex, 3.1% (0.7%) S. downsi Vargas et al., 0.7% S. samboni Jennings and 0.2% S. metallicum Bellardi complex, showing a strong correlation between black¯y abundance and the prevalence of patent infection. An epizootic of IIV in January and February (infection rates 41±100%) was followed by absence of larvae (March±August) until the end of the rainy season, when numbers collected on nylon strings rose to » 1/ cm with patent IIV infection rates of 0±12.5% during September±December. Further investigations are underway to isolate this IIV and assess its potential usefulness for biological control of Simulium pests and vectors of onchocerciasis. Inglés

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