Assessment of rubber tree panels under crowns resistant to South American leaf blight

The objective of this work was to assess the performance of panel clones under crowns resistant to South American leaf blight (Microcyclus ulei). The experiment was carried out with 18 panel clones crown-budded with Hevea pauciflora x H. guianensis, in a Xanthic Ferralsol (Oxisol) in Manaus, AM, Brazil. The following parameters were evaluated: dry rubber yield, plant nutritional status, and anatomical and physiological characteristics of the latex vessels. In the first three years of evaluation, the panel clones IAN 2878, IAN 2903, CNS AM 7905, CNS AM 7905 P1, and PB 28/59 showed the highest dry rubber yield potential, while the clones IAN 6158, IAN 6590, and IAN 6515 should not be recommended for crown budding. Higher potassium and copper foliar content in panel clones were associated to an increase in dry rubber yield. The simultaneous evaluation of anatomical and physiological characteristics of latex is fundamental for the selection of panel clones in the Amazon region. Crown budding is an efficient technology for South American leaf blight management in endemic regions.

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Molecular mapping of genes conferring field resistance to South American Leaf Blight (Microcyclus ulei) in rubber tree

Theoretical and Applied Genetics ◽

10.1007/s00122-003-1407-9 ◽

2003 ◽

Vol 108 (1) ◽

pp. 160-167 ◽

Cited By ~ 35

Author(s):

V. Le Guen ◽

D. Lespinasse ◽

G. Oliver ◽

M. Rodier-Goud ◽

F. Pinard ◽

...

Keyword(s):

Molecular Mapping ◽

Rubber Tree ◽

Field Resistance ◽

Leaf Blight ◽

South American ◽

Microcyclus Ulei

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Performance of different rubber tree clones against South American leaf blight (Microcyclus ulei)

Forest Pathology ◽

10.1111/efp.12084 ◽

2013 ◽

Vol 44 (3) ◽

pp. 211-218 ◽

Cited By ~ 2

Author(s):

L. G. Silva ◽

W. C. J. Junior ◽

A. F. Souza ◽

F. R. Alves ◽

E. L. Furtado

Keyword(s):

Rubber Tree ◽

Leaf Blight ◽

South American ◽

Microcyclus Ulei

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Relationship of Cyanogenic Capacity (HCN-c) of the Rubber Tree Hevea brasiliensis to Susceptibility to Microcyclus ulei, the Agent Causing South American Leaf Blight

Journal of Phytopathology ◽

10.1111/j.1439-0434.1988.tb00990.x ◽

1988 ◽

Vol 122 (1) ◽

pp. 54-67 ◽

Cited By ~ 35

Author(s):

Reinhard Lieberei

Keyword(s):

Hevea Brasiliensis ◽

Rubber Tree ◽

Leaf Blight ◽

South American ◽

Microcyclus Ulei ◽

Relationship Of ◽

Cyanogenic Capacity

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Identification of QTLs involved in the resistance to South American leaf blight (Microcyclus ulei) in the rubber tree

Theoretical and Applied Genetics ◽

10.1007/s001220051379 ◽

2000 ◽

Vol 100 (6) ◽

pp. 975-984 ◽

Cited By ~ 50

Author(s):

D. Lespinasse ◽

L. Grivet ◽

V. Troispoux ◽

M. Rodier-Goud ◽

F. Pinard ◽

...

Keyword(s):

Rubber Tree ◽

Leaf Blight ◽

South American ◽

Microcyclus Ulei

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Development parameters of the latent period as a response of rubber tree resistance to South American leaf blight

Summa Phytopathologica ◽

10.1590/0100-5405/217084 ◽

2021 ◽

Vol 47 (2) ◽

pp. 103-109

Author(s):

João Alberto Zago Bevenuto ◽

José Raimundo de Souza Passos ◽

Edson Luiz Furtado

Keyword(s):

Latent Period ◽

Rubber Tree ◽

Leaf Blight ◽

Slight Variation ◽

South American ◽

Infection Frequency ◽

Breeding Programs ◽

Lesion Diameter ◽

Complete Resistance ◽

Traditional Breeding

ABSTRACT The major phytosanitary problem for rubber tree cultivation in Brazil is the disease known as South American leaf blight, caused by the fungus Microcyclus ulei. Its symptoms manifest in young leaves and cause intense defoliation, resulting in reduced latex production and even the death of susceptible plants. Thus, this disease consists in a constant threat to East Asian plantations. As worldwide traditional breeding programs have evolved, interspecific hybrid clones have currently been used for planting. They are more productive and show better resistance to pathogens. However, traditional breeding programs have not led to significant progress in resistance to South American leaf blight since the selection is directed to clones with complete resistance. In this pathosystem, horizontal or partial resistance (HR) and vertical or complete resistance (VR) can act simultaneously, evidencing their complexity and difficult quantification. This study aimed to: characterize the foliar lesion type in Hevea sp. X M. ulei pathosystem; verify the clonal susceptibility to pathogens; analyze the infection frequency for resistance quantification in Hevea sp. x M. ulei pathosystem, and recommend differentiating rubber tree clones to quantify M. ulei races in Brazil. The monocyclic parameters (latent period and lesion diameter) are applicable for resistance quantification in Hevea sp. x M. ulei pathosystem. Latent period had slight variation among clones. Lesion diameter had wide variation among clones and was a discriminating parameter for horizontal resistance and vertical resistance.

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