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

Por: Hernández, O [autor/a].
Maldonado, G [autor/a] | Williams, Trevor [autor/a].
Tipo de material: Artículo impreso(a) Artículo impreso(a) Tema(s): Aleyrodidae | Iridovirus | Oncocercosis | Control biológico de plagasTema(s) en inglés: Aleyrodidae | Iridoviruses | Onchocercosis | Pest control biologicalDescriptor(es) geográficos: Chiapas (México) Clasificación: AR/632.752 / H4 Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: Medical and Veterinary Entomology. volumen 14, número 4 (December 2000), páginas 458-462. --ISSN: 1365-2915Número de sistema: 34034Resumen:
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.
Lista(s) en las que aparece este ítem: Williams Trevor
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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. eng

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. eng

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