Resistance to Rust and Late Leafspot Diseases in Some Genotypes of <i>Arachis hypogaea</i>1

Subrahmanyam, P.; McDonald, D.; Gibbons, R. W.; Nigam, S. N.; Nevill, D. J.

doi:10.3146/i0095-3679-9-1-2

Cited by 93 publications

(78 citation statements)

References 4 publications

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“…cultivars, genotypes, or screening new fungicides). One such scale is the ICRISAT 1-9 scale, which is used to evaluate breeding lines of legumes for disease resistance (Subrahmanyam et al, 1982). Thus, interval scales provide an assessment method to obtain relative rankings of treatments with respect to disease severity, as well as some (limited) quantitative information.…”

Section: Choosing a Scale Of Measurement And Types Of Scalesmentioning

confidence: 99%

The Role of Psychophysics in Phytopathology: The Weber–Fechner Law Revisited

Nutter

Esker

2006

Eur J Plant Pathol

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The accuracy and precision of disease severity assessment data might be improved if there was a better understanding of how the laws of psychophysics actually relate to the theory and practice of phytopathometry. In this regard, we utilized a classical method developed in the field of psychophysics (the method of comparison stimuli) to test Horsfall and Barratt's claim that raters cannot accurately discriminate disease severity levels between 25% and 50% because, according to the Weber-Fechner law, visual acuity is proportional to the logarithm of the intensity of the stimulus. We show for two pathosystems, wheat leaf rust and grapevine downy mildew, that raters can accurately discriminate disease severity levels between 25% and 50%, and that although Weber's law appears to hold true, Fechner's law does not. Furthermore, based upon our results, the relationship between actual (true) disease severity (X) and disease severity estimated by raters (Y) is linear, not logarithmic as proposed by Horsfall and Barratt.

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Section: Choosing a Scale Of Measurement And Types Of Scalesmentioning

confidence: 99%

The Role of Psychophysics in Phytopathology: The Weber–Fechner Law Revisited

Nutter

Esker

2006

Eur J Plant Pathol

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“…Esta escala leva em consideração a quantidade de manchas/ folha, o número de folhas com lesões e a quantidade de desfolha ao longo do ramo. A nota é aplicada em um dos ramos primários da planta, tomado aleatoriamente (Subrahmanyam et al, 1982).…”

Section: Methodsunclassified

Resistência à mancha preta em populações F4 selecionadas de cruzamentos entre o amendoim cultivado e um anfidiplóide de Arachis

Santos¹,

Godoy²,

Fávero³

et al. 2011

Bragantia

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Neste trabalho avaliou-se, em condições de campo, o potencial de resistência à mancha preta (Cercosporidium personatum) em plantas F4, selecionadas de cruzamentos entre genótipos de Arachis hypogaea (acessos VGaRoSv 12549 e VGaRoSv 12548 e a cultivar IAC Caiapó) e um anfidiplóide sintético (Arachis ipäensis x Arachis duranensis)4x. O experimento foi desenvolvido no ano agrícola de 2007/2008, em Pindorama (SP). Avaliaram-se noventa e três famílias de plantas em F4, em parcelas com dez plantas distribuídas em linhas de três metros de comprimento, espaçadas de dois metros, bem como os controles, as cultivares IAC Caiapó e Runner IAC 886, a espécie A. ipäensis e o anfidiplóide. Foram realizadas três avaliações da doença durante o ciclo, utilizando uma escala diagramática de notas visuais de sintomas de lesões e desfolha. Avaliaram-se também alguns caracteres morfoagronômicos, como indicativos da proximidade do material silvestre com o cultivado. A variabilidade da resistência à doença foi estudada através das médias de ASCPD (Área sob a Curva de Progresso da Doença). Pelos resultados constata-se que o anfidiplóide utilizado é interessante fonte de resistência. A seleção pelo método genealógico propiciou obter indivíduos com resistência ao nível do parental silvestre, mas as chances de se obter indivíduos resistentes e com caracteres agronômicos desejáveis é pequena, sugerindo a necessidade de retrocruzamentos.

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“…Leaf spot symptoms can appear on any above ground parts of groundnut including leaves, petioles, stipules, stems and pegs in the later stages of disease (Subrahmanyam et al, 1982). Spots first develop on the upper surface of lower leaves as small necrotic pinhead size spots that enlarge and be-come light to dark brown or black circular spots ranging from 1 to 10 mm in diameter (Tshilenge, 2010).…”

Section: Introductionmentioning

confidence: 99%

Response of groundnut (Arachis hypogaea L.) cultivars to late leaf spot disease (Passalora personata) under different sowing dates

Dey

Dhutraj

Suryawanshi

et al. 2016

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Experiments were conducted to investigate the effect of date of sowing on groundnut cultivars against late leaf spot disease severity, defoliation, frequency and size of the leaf spot which revealed that all these aspects were significantly influenced by the date of sowing and crop varieties which directly affect the pod yield and test weight. The crop sown early on 25 th June exhibited maximum mean late leaf spot disease severity (range 43.63 to 54.05%), defoliation (range, 17.22 to 22.30%), frequency (range, 1.32 to 1.78 / mm 2 ) and size (range, 1.49 to 1.56 / mm 2 ) and thereby gave reduced pod yield (range, 1225 to 1720 kg/ha) and test weight (28.66 to 32.97 g) followed by 10 th July and 25 th July. Among the groundnut cultivars, susceptible cv. JL 24 exhibited maximum mean disease severity (range, 35.94 to 54.05 %), defoliation (range, 11.61 to 22.30 %), frequency (range, 1.23 to 1.78 / mm 2 ) and size (range, 1.26 to 1.56 / mm 2 ), followed by TAG 24 and TG 26. However, LGN 1 exhibited least mean disease severity, defoliation, frequency and size with the highest pod yield (ranges, 1720 to 2332 kg/ha) and test weight (ranges, 32.97 to 38.59 g).

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Resistance to Rust and Late Leafspot Diseases in Some Genotypes of Arachis hypogaea1

Cited by 93 publications

References 4 publications

The Role of Psychophysics in Phytopathology: The Weber–Fechner Law Revisited

The Role of Psychophysics in Phytopathology: The Weber–Fechner Law Revisited

Resistência à mancha preta em populações F4 selecionadas de cruzamentos entre o amendoim cultivado e um anfidiplóide de Arachis

Response of groundnut (Arachis hypogaea L.) cultivars to late leaf spot disease (Passalora personata) under different sowing dates

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