Altitude, tree species and soil type are the main factors influencing the severity of Phaeoramularia leaf and fruit spot disease of citrus in the humid zones of Cameroon

Ndo, Eunice Golda Danièle; Bella-Manga, Faustin; Ndindeng, Sali Atanga; Ndoumbè-Nkeng, M.; Fontem, Ajong Dominic; Cilas, Christian

doi:10.1007/s10658-010-9660-7

Cited by 18 publications

(15 citation statements)

References 11 publications

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“…To interpret the effects of spatial pattern, we account for other potential differences in the plots within the same spatial type, which could underpin the highlighted effect. The other potential differences may come from factors known to influence the disease severity: Vegetation composition, Citrus composition and sensibility, and geographical zones with different altitudes and temperatures [13]. They were no significant difference in vegetation composition among the plots of the different spatial types.…”

Section: Discussionmentioning

confidence: 94%

Spatial Organisation Influences Citrus <i>Pseudocercospora</i> Leaf and Fruit Spot Disease Severity in Cocoa-Based Agroforestry Systems

Ndo¹,

Mvondo²,

Ambang³

et al. 2019

AJPS

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An investigation to assess the spatial structure and severity of Pseudocercospora leaf and fruit spot disease (PLFSD) on citrus trees in cocoa-based agroforests was carried out in three contrasting ecological zones in southern Cameroon, viz: 1) the humid forest zone, 2) the degraded forest zone, and 3) the forest-savannah transition zone. Two main parameters were investigated viz: 1) the spatial structure of cocoa based agroforests, and 2) the disease severity. In total, the spatial structure of 19 cocoa-based agroforests was analysed using the Ripley K(r) function, meanwhile the collection of epidemiological data that consisted of noting the presence of PLFSD spots on leaves and fruits on 438 citrus trees was used to characterise the severity of the disease. Results showed that, the spatial structure of citrus trees in these agroforests investigated were regular in seven plots, random in nine, and aggregated in three. Aggregated plots presented a significantly higher mean of disease severity on leaves and fruits (28.55 and 30.37 respectively), as compared to randomised (20.91 and 16.32 respectively) and regular plots (16.28 and 14.97 respectively), at P-value < 0.05. These results suggest that the spatial structure of citrus trees in the cocoa-based agroforests studied influences the severity of PFLSD. Proper integrated control measures can therefore be initiated, leading to a considerable reduction of the use of manufactured inputs, and thereby, the cost of production of citrus fruits.

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Section: Discussionmentioning

confidence: 94%

Spatial Organisation Influences Citrus <i>Pseudocercospora</i> Leaf and Fruit Spot Disease Severity in Cocoa-Based Agroforestry Systems

Ndo¹,

Mvondo²,

Ambang³

et al. 2019

AJPS

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“…In Cameroon, citrus are mainly grown in cocoa-based agroforestry systems (CBAFS) [7,46]. These are complex, highly biodiverse, natural forest-like cropping systems (Figure 2) [30,47,48].…”

Section: Complex Cocoa-based Agroforest Systems and Structural Characteristicsmentioning

confidence: 99%

Integrated Management Approach to Citrus Fungal Diseases by Optimizing Cocoa-Based Agroforests Structural Characteristics

Danièle¹,

Etienne²

2021

Citrus - Research, Development and Biotechnology

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The health and productivity of citrus are generally jeopardized by a host of diseases, for which the environmental conditions of the cropping system are critical drivers. Several studies conducted on various diseases of perennial crops have shown the involvement of the structural futures of the cocoa-based agroforestry system (CBAFS) in the spread of pathogens and the epidemics development. This chapter highlights the effect of the CBAFS’s structural characteristics on the intensity of three citrus diseases in the humid forest zones of Cameroon. The involvement of CBAFS structural characteristics in diseases regulation is demonstrated. In particular, the spatial structure of citrus in agroforests shows an effect on the spread of diseases. Moreover, distribution of citrus in the CBAFS, with minimum spacing of 12 m between citrus trees, limits the damage caused by Pseudocercospora leaf and fruit spot disease (PLFSD) and citrus diseases caused by Phytophthora (CDP). Dense shading helps to minimize the intensity of diseases such as CDP and PLFSD and Citrus scab disease. This work may make it possible to contribute to the development of an integrated management tool for citrus diseases in an associated crop context.

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“…In a survey of disease-affected areas, Ndo et al (2010) found that disease severity was lower in citrus species grown on volcanic soils in Cameroon than in other soil-types. Altitude was also a key factor affecting disease severity.…”

Section: Leaf and Fruit Spotsmentioning

confidence: 99%

Effect of Nutrition and Soil Function on Pathogens of Tropical Tree Crops

McMahon¹

2012

Plant Pathology

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Altitude, tree species and soil type are the main factors influencing the severity of Phaeoramularia leaf and fruit spot disease of citrus in the humid zones of Cameroon

Cited by 18 publications

References 11 publications

Spatial Organisation Influences Citrus <i>Pseudocercospora</i> Leaf and Fruit Spot Disease Severity in Cocoa-Based Agroforestry Systems

Spatial Organisation Influences Citrus <i>Pseudocercospora</i> Leaf and Fruit Spot Disease Severity in Cocoa-Based Agroforestry Systems

Integrated Management Approach to Citrus Fungal Diseases by Optimizing Cocoa-Based Agroforests Structural Characteristics

Effect of Nutrition and Soil Function on Pathogens of Tropical Tree Crops

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Altitude, tree species and soil type are the main factors influencing the severity of Phaeoramularia leaf and fruit spot disease of citrus in the humid zones of Cameroon

Cited by 18 publications

References 11 publications

Spatial Organisation Influences Citrus &lt;i&gt;Pseudocercospora&lt;/i&gt; Leaf and Fruit Spot Disease Severity in Cocoa-Based Agroforestry Systems

Spatial Organisation Influences Citrus &lt;i&gt;Pseudocercospora&lt;/i&gt; Leaf and Fruit Spot Disease Severity in Cocoa-Based Agroforestry Systems

Integrated Management Approach to Citrus Fungal Diseases by Optimizing Cocoa-Based Agroforests Structural Characteristics

Effect of Nutrition and Soil Function on Pathogens of Tropical Tree Crops

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Spatial Organisation Influences Citrus <i>Pseudocercospora</i> Leaf and Fruit Spot Disease Severity in Cocoa-Based Agroforestry Systems

Spatial Organisation Influences Citrus <i>Pseudocercospora</i> Leaf and Fruit Spot Disease Severity in Cocoa-Based Agroforestry Systems