Results 101 to 110 of about 153 (122)

Factors affecting discharge, germination and viability of spores of Microcyclus ulei

Transactions of the British Mycological Society, 1976
Ascospores of Microcyclus ulei are forcibly discharged in rapid succession when leaves are wetted at sub-ambient temperatures (14 °C). Leaves which fall during wintering discharge ascospores readily after rain. Ascospores are released from green leaves throughout the dry season.
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South American leaf blight of Hevea brasiliensis: spore dispersal of Microcyclus ulei

Annals of Applied Biology, 1976
SUMMARYTrapping of ascospores and conidia of Microcyclus ulei among young trees of Hevea brasiliensis in Trinidad from May 1973 to May 1975 snowed that ascospores occurred throughout the year whilst conidia were present only during the wet season. Peak ascospore concentrations occurred in August and November during the wet season, the latter peak being
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Characterization of polymorphic microsatellite markers for Microcyclus ulei, causal agent of South American leaf blight of rubber trees [PDF]

Molecular Ecology Notes, 2004
AbstractSouth American leaf blight caused by the ascomycete Microcyclus ulei is the most harmful disease of the rubber tree in Latin America and a potential threat to Asiatic and African natural rubber production. Until now, the variability of this fungus was assessed through observation of pathogenicity of isolates on a range of rubber tree clones ...
Le Guen, Vincent, Rodier-Goud, Marguerite, Troispoux, Valérie, Xiong, Tou, Brottier, Philippe, Billot, Claire, Seguin, Maria-Susana   +6 more
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South American leaf blight of Hevea brasiliensis: culture of Microcyclus ulei

Transactions of the British Mycological Society, 1978
Microcyclus ulei (P. Henn.) Arx was isolated by depositing fresh conidia on plain agar and then transferring it to potato sucrose agar. Dried rubber leaf extract stimulated growth, but some brands of agar inhibited growth and sporulation. Two morphological strains occurred amongst field isolations. The free sporulating strain appeared to be associated
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Chemical and structural barriers toMicrocyclus ulei, the agent of South American leaf blight, inHeveaspp.

European Journal of Forest Pathology, 1995
SummaryYoung leaves of different rubber‐tree clones were inoculated withMicrocyclus uleiunder controlled conditions. Under ultraviolet light, intense blue fluorescent light was emitted from the penetration site 6 h after inoculation. The speed of the appearance of this fluorescence was related to the degree of resistance of the clones: 12–36 h in ...
Garcia, Dominique, Cazaux, E., Rivano, Franck, D'Auzac, Jean   +3 more
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Assessing resistance of rubber tree clones to Microcyclus ulei in large-scale clone trials in Ecuador: a less time-consuming field method [PDF]

European Journal of Plant Pathology, 2009
Resistance of rubber tree clones to South American Leaf Blight (SALB) caused by the fungus Microcyclus ulei is normally assessed in specific large-scale clone trials, which in general entail a considerable amount of work. Four variables are observed monthly on each tree over many years: disease severity and conidial sporulation intensity on young ...
Rivano, Franck, Martinez, Malena, Cevallos, Victor, Cilas, Christian   +3 more
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Obtaining isolates of Microcyclus ulei, a fungus pathogenic to rubber trees, from ascospores [PDF]

, 2010
Microcyclus ulei, a fungus causing South American leaf blight of rubber tree, can only be isolated from asexual spores, which remain on a lesion just for a few days. This is a serious problem when wishing to study the diversity of the fungus on wild trees, which bear stromatic lesions almost exclusively on old leaves. The proposed technique can be used
Guyot, Jean, Doare, Fabien
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Genetic mapping and QTL analysis of Microcyclus ulei resistance in rubber tree (Hevea spp.)

2006
South American Leaf Blight (SALB), due to the fungus Microcyclus ulei, is potentially the major phytosanitary threat for rubber tree (Hevea brasiliensis) cultivation all around the world. After fifty years of breeding efforts, attempts to create resistant cultivars failed, the selected resistances being each time rapidly overcome by the fungus.
Seguin, Marc, Lespinasse, Denis, Garcia, Dominique, Mattos, Carlos Raimunto Reis, Doare, Fabien, Le Guen, Vincent   +5 more
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Cyanogenesis of Hevea brasiliensis during Infection with Microcyclus ulei¹⁾

Journal of Phytopathology, 1986
AbstractEight Hevea species have been shown to be cyanogenic.They all liberated HCN following mechanical tissue injury. Infection of Hevea leaves with conidia of the plant pathogen Microcyclus ulei leads to a large reduction of hydrocyanic acid potential, while only small amounts of HCN are set free from the leaves into the atmosphere.
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SALB : study of host-parasite relations between Hevea and Microcyclus ulei

1994
A cette date, aucune méthode de lutte totalement efficace n'existe contre la maladie sud américaine des feuilles d'hévéa (SALB). Des génotypes résistants ont seulement été sélectionnés. Cette communication donne l'état des travaux conduits sur les essais génétiques en Guyane Française et au Brésil après une étude sur la variabilité du pouvoir pathogène
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