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Nematophagous Verticillium spp. in soils infested with Meloidogyne spp. in Cuba: isolation and screening

by Hidalgo Diaz, L; Bourne, J.M; Kerry, B.R; Rodríguez, M.G.
Publisher: 2000ISSN: 0967-0874.Subject(s): COFFEA ARABICA | LYCOPERSICON ESCULENTUM | VERTICILLIUM | MELOIDOGYNE | NEMATODA | NEMATODOS DE LAS PLANTAS | AGENTES DE CONTROL BIOLOGICO | CONTROL BIOLOGICO | CONTROL DE PLAGAS | CUBA | COFFEA ARABICA | LYCOPERSICON ESCULENTUM | VERTICILLIUM | MELOIDOGYNE | NEMATODA | PLANT NEMATODES | BIOLOGICAL CONTROL AGENTS | BIOLOGICAL CONTROL | PEST CONTROL | CUBA | COFFEA ARABICA | LYCOPERSICON ESCULENTUM | VERTICILLIUM | MELOIDOGYNE | NEMATODA | NEMATODE DES PLANTES | AGENT DE LUTTE BIOLOGIQUE | LUTTE BIOLOGIQUE | LUTTE ANTIRAVAGEUR | CUBA In: International Journal of Pest Management (RU) v. 46(4) p. 277-284Summary: A total of 83 nematophagous fungi isolates were collected from coffee plantations in Cuba, and identified morphologically as V. chlamydosporium var. chlamydosporium, V. chlamydosporium var. catenulatum, V. psalliotae, V. suchlasporium and an isolateof V. chlamydosporium var. chlamydosporium with unusually large dictyochlamydospores. From these, 24 that represented a range of origins were selected and screened for their ability to parasitize eggs of root-knot nematodes (Meloidogyne spp.), colonize the rhizosphere of barley roots and produce chlamydospores. None of the isolates grew at temperatures below 15°C and V. suchlasporium grew at a faster rate at lower temperatures than the other isolates. These were also screened in the glasshouse and V. chlamydosporium var. catenulatum caused the greatest reduction in nematode populations. One isolate of each subspecies of V. chlamydosporium was tested with the standard, Rothamsted isolate 10, on a range of host plants. The greatest reduction in numbers of nematodes occurred on tomato plants (cv. Pixie). The Rothamsted isolate 10 reduced numbers of nematodes to a greater extent than the other isolates, and therefore has the greatest potential as a biological control agent of root-knot nematodes.
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A total of 83 nematophagous fungi isolates were collected from coffee plantations in Cuba, and identified morphologically as V. chlamydosporium var. chlamydosporium, V. chlamydosporium var. catenulatum, V. psalliotae, V. suchlasporium and an isolateof V. chlamydosporium var. chlamydosporium with unusually large dictyochlamydospores. From these, 24 that represented a range of origins were selected and screened for their ability to parasitize eggs of root-knot nematodes (Meloidogyne spp.), colonize the rhizosphere of barley roots and produce chlamydospores. None of the isolates grew at temperatures below 15°C and V. suchlasporium grew at a faster rate at lower temperatures than the other isolates. These were also screened in the glasshouse and V. chlamydosporium var. catenulatum caused the greatest reduction in nematode populations. One isolate of each subspecies of V. chlamydosporium was tested with the standard, Rothamsted isolate 10, on a range of host plants. The greatest reduction in numbers of nematodes occurred on tomato plants (cv. Pixie). The Rothamsted isolate 10 reduced numbers of nematodes to a greater extent than the other isolates, and therefore has the greatest potential as a biological control agent of root-knot nematodes.

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