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South American leaf blight of Hevea. II. Early evaluation of clonal resistance.

dc.creatorRivano, F., autor. aut 50060
dc.descriptionThe CIRAD experimental station in French Guiana is testing 31 Hevea clones from Asia, Africa and Latin America in a smallscale trial situated in forest naturally contaminated with Microcyclus ulei, the causal agent of South American leaf blight. Anadditional study of resistance to M. ulei under controlled conditions by artificially inoculating potted plants was used to investigate components of resistance and consolidate field results. Clones were evaluated for abscission rates, foliage density and disease severity over 3 years. Results revealed that the clones fell into 3 groups according to their geographic origins and susceptibility to M. ulei: highly susceptible (Asia), highly resistant (South America) and an intermediate group containing Asian clones or South American and Asian hybrids. Clones RRIC132, IAN3087, IAN2878, IAN873, IAN717 and RO38 showed total resistance to M. ulei, and CD-1078, GU164, GU198, GU969, IRCA519, IRCA570, IRCA573, IRCA621 and IRCA652 exhibited high levels of partial resistance. Promising clones were selected for a breeding programme aimed at improving resistance and for testing in a Microcyclus zone. A methodology for early evaluation of Hevea resistance to leaf diseases in field trials is also proposed.
dc.descriptionThe CIRAD experimental station in French Guiana is testing 31 Hevea clones from Asia, Africa and Latin America in a smallscale trial situated in forest naturally contaminated with Microcyclus ulei, the causal agent of South American leaf blight. Anadditional study of resistance to M. ulei under controlled conditions by artificially inoculating potted plants was used to investigate components of resistance and consolidate field results. Clones were evaluated for abscission rates, foliage density and disease severity over 3 years. Results revealed that the clones fell into 3 groups according to their geographic origins and susceptibility to M. ulei: highly susceptible (Asia), highly resistant (South America) and an intermediate group containing Asian clones or South American and Asian hybrids. Clones RRIC132, IAN3087, IAN2878, IAN873, IAN717 and RO38 showed total resistance to M. ulei, and CD-1078, GU164, GU198, GU969, IRCA519, IRCA570, IRCA573, IRCA621 and IRCA652 exhibited high levels of partial resistance. Promising clones were selected for a breeding programme aimed at improving resistance and for testing in a Microcyclus zone. A methodology for early evaluation of Hevea resistance to leaf diseases in field trials is also proposed.
dc.language- F
dc.relation
dc.subjectClones.
dc.subjectdisease resistance
dc.subjectevaluation
dc.subjectgermplasm
dc.subjectplant diseases
dc.subjectplant genetic resources
dc.subjectplant pathogenic fungi
dc.subjectplant pathogens
dc.subjectplant pathology
dc.subjectrubber plants
dc.subjecttesting
dc.subjectvarietal reactions
dc.subjectNatural immunity
dc.subjectEvaluation
dc.subjectEvaluation
dc.subjectPlant diseases
dc.subjectPlant diseases
dc.subjectGermplasm resources, Plant
dc.subjectPhytopathogenic microorganisms
dc.subjectPlant diseases
dc.subjectPlant diseases
dc.subjectRubber plants
dc.subjectTesting
dc.subjectTesting
dc.titleSouth American leaf blight of Hevea. II. Early evaluation of clonal resistance.
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