Results 141 to 150 of about 1,221 (153)

Occurrence of eight races of Microcyclus ulei on Hevea rubber in Bahia, Brazil

Transactions of the British Mycological Society, 1986
Conidia of Microcyclus ulei from infected leaves of twelve clones of Hevea , including H. brasiliensis and its hybrids with H. benthamiana , were inoculated to leaf disks of 19 clones of diverse genetic background. From the results, eight physiologic races of M. ulei were distinguished.
K.H. Chee, Zhang Kai-Ming, T.W. Darmono
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Molecular mapping of genes conferring field resistance to South American Leaf Blight (Microcyclus ulei) in rubber tree [PDF]

Theoretical and Applied Genetics, 2003
The South American Leaf Blight (SALB), caused by the fungus Microcyclus ulei, is the major rubber tree disease in all Central and South America. A population of 192 progeny individuals derived from a cross between a resistant clone and a susceptible cultivated clone was planted in a field trial in French Guiana in order to evaluate the resistance ...
Le Guen, Vincent, Lespinasse, Denis, Oliver, Gérald, Rodier-Goud, Marguerite, Pinard, Fabrice, Seguin, Marc   +5 more
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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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Long lasting rubber tree resistance to Microcyclus ulei characterized by reduced conidial emission and absence of teleomorph [PDF]

Crop Protection, 2008
Abstract The resistance of the MDF 180 Hevea brasiliensis cultivar to South American leaf blight caused by Microcyclus ulei has been studied under both controlled conditions of inoculation, and under natural infestation in the Brazilian state of Bahia.
Le Guen, Vincent, Guyot, Jean, Reis de Mattos, Carlos Raimundo, Seguin, Marc, Garcia, Dominique   +4 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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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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A newly identified locus controls complete resistance to Microcyclus ulei in the Fx2784 rubber clone

Tree Genetics & Genomes, 2013
Using cultivars which are genetically resistant to South American leaf blight (SALB) caused by the fungus Microcyclus ulei is the only way to plant rubber trees in disease-affected areas. Numerous field observations led to the hypothesis that the resistance of the cultivar Fx2784 to SALB is likely to be monogenic.
Le Guen, Vincent, Garcia, Dominique, Mattos, Carlos Raimunto Reis, Fouet, Olivier, Doare, Fabien, Condina, Virgile, Seguin, Marc   +6 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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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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