OrangerV1, Main, Exploration, bibRecord, 002199

Spatial pattern of black spot incidence within citrus trees related to disease severity and pathogen dispersal

Identifieur interne : 002199 ( Main/Exploration ); précédent : 002198; suivant : 002200

Spatial pattern of black spot incidence within citrus trees related to disease severity and pathogen dispersal

Auteurs : M. B. Sposito [Brésil] ; L. Amorim [Brésil] ; R. B. Bassanezi [Brésil] ; A. Filho Bergamin [Brésil] ; B. Hau [Allemagne]

Source :

Plant pathology [ 0032-0862 ] ; 2008.

RBID : Pascal:08-0113310

Descripteurs français

Pascal (Inist)
- Répartition spatiale, Incidence, Arbre fruitier, Maladie, Indice gravité, Dispersion, Dissémination, Phyllosticta, Phytopathologie, Agrume, Rutaceae, Pathogène, Citrus sinensis, Guignardia citricarpa.
Wicri :
- topic : Maladie, Agrume.

English descriptors

KwdEn :
- Citrus fruit, Citrus sinensis, Disease, Dispersion, Dissemination, Fruit tree, Guignardia citricarpa, Incidence, Pathogenic, Phyllosticta, Plant pathology, Rutaceae, Severity score, Spatial distribution.

Abstract

Guignardia citricarpa, the causal agent of citrus black spot, forms airborne ascospores on decomposing citrus leaves and water-spread conidia on fruits, leaves and twigs. The spatial pattern of diseased fruit in citrus tree canopies was used to assess the importance of ascospores and conidia in citrus black spot epidemics in Sao Paulo State, Brazil. The aggregation of diseased fruit in the citrus tree canopy was quantified by the binomial dispersion index (D) and the binary form of Taylor's Power Law for 303 trees in six groves. D was significantly greater than 1 in 251 trees. The intercept of the regression line of Taylor's Power Law was significantly greater than 0 and the slope was not different from 1, implying that diseased fruit was aggregated in the canopy independent of disease incidence. Disease incidence (p) and severity (S) were assessed in 2875 citrus trees. The incidence-severity relationship was described (R² = 88.7%) by the model ln (S) = ln (a) + bCLL(p) where CLL = complementary log-log transformation. The high severity at low incidence observed in many cases is also indicative of low distance spread of G. citricarpa spores. For the same level of disease incidence, some trees had most of the diseased fruit with many lesions and high disease severity, whereas other trees had most of the fruit with few lesions and low disease severity. Aggregation of diseased fruit in the trees suggests that splash-dispersed conidia have an important role in increasing the disease in citrus trees in Brazil.

Affiliations:

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Le document en format XML

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<author><name sortKey="Bassanezi, R B" sort="Bassanezi, R B" uniqKey="Bassanezi R" first="R. B." last="Bassanezi">R. B. Bassanezi</name>
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<sZ>4 aut.</sZ>
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<term>Dispersion</term>
<term>Dissemination</term>
<term>Fruit tree</term>
<term>Guignardia citricarpa</term>
<term>Incidence</term>
<term>Pathogenic</term>
<term>Phyllosticta</term>
<term>Plant pathology</term>
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<term>Dispersion</term>
<term>Dissémination</term>
<term>Phyllosticta</term>
<term>Phytopathologie</term>
<term>Agrume</term>
<term>Rutaceae</term>
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<front><div type="abstract" xml:lang="en">Guignardia citricarpa, the causal agent of citrus black spot, forms airborne ascospores on decomposing citrus leaves and water-spread conidia on fruits, leaves and twigs. The spatial pattern of diseased fruit in citrus tree canopies was used to assess the importance of ascospores and conidia in citrus black spot epidemics in Sao Paulo State, Brazil. The aggregation of diseased fruit in the citrus tree canopy was quantified by the binomial dispersion index (D) and the binary form of Taylor's Power Law for 303 trees in six groves. D was significantly greater than 1 in 251 trees. The intercept of the regression line of Taylor's Power Law was significantly greater than 0 and the slope was not different from 1, implying that diseased fruit was aggregated in the canopy independent of disease incidence. Disease incidence (p) and severity (S) were assessed in 2875 citrus trees. The incidence-severity relationship was described (R<sup>2</sup>
 = 88.7%) by the model ln (S) = ln (a) + bCLL(p) where CLL = complementary log-log transformation. The high severity at low incidence observed in many cases is also indicative of low distance spread of G. citricarpa spores. For the same level of disease incidence, some trees had most of the diseased fruit with many lesions and high disease severity, whereas other trees had most of the fruit with few lesions and low disease severity. Aggregation of diseased fruit in the trees suggests that splash-dispersed conidia have an important role in increasing the disease in citrus trees in Brazil.</div>
</front>
</TEI>
<affiliations><list><country><li>Allemagne</li>
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<name sortKey="Amorim, L" sort="Amorim, L" uniqKey="Amorim L" first="L." last="Amorim">L. Amorim</name>
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Spatial pattern of black spot incidence within citrus trees related to disease severity and pathogen dispersal

Spatial pattern of black spot incidence within citrus trees related to disease severity and pathogen dispersal

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri