Spatial distribution of citrus Pseudocercospora leaf and fruit spot disease and shade effect on disease intensity

Ndo Eunice Golda Danièle, Akoutou Mvondo Etienne, Bella Manga Faustin, Bidzanga Nomo Lucien, Cilas Christian. 2023. Spatial distribution of citrus Pseudocercospora leaf and fruit spot disease and shade effect on disease intensity. Crops, 3 (1), n.spéc. Abiotic Stress Tolerance in Perennial Crops : 11-23.

https://doi.org/10.3390/crops3010002

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Résumé : Adapting agricultural systems to face persistent environmental hazards is at the center of global concerns. In line with this, understanding and highlighting the structural characteristics of agroforestry systems could strengthen their resilience in terms of disease management. This study was conducted to evaluate the effect of shade on the intensity of citrus leaf and fruit spot disease caused by Pseudocercospora (PLFSD). Investigations to assess the effects of shade components on the incidence of PLFSD were carried out on 15-year-old tangerine trees in a cocoa-based agroforestry plot (Bokito) during four fruits seasons. Tangerines under the shade of large forest trees were compared to others located under full sunlight. A complementary experiment was conducted on young grapefruit plants in an orchard with mango and avocado groves in Foumbot. Three shading conditions, i.e., under avocado trees, under mango trees, and without shade, were explored. Data on shade and PLFSD incidence were collected and analyzed. Our findings show that PLFSD incidence was null on tangerine leaves from trees under shade compared to those under full sunlight. The same trends were observed in fruits under shade and under full sunlight. Disease incidence on grapefruit leaves was lower on trees under shade compared to those under full sunlight. In short, shade trees appear to constitute potential physical barriers to disease progression. This study also highlights disease spatial distribution as beyond 12 m of distance between neighboring trees, no spatial dependence of disease spread was observed. Management actions based on the distance between citrus trees and regulating shade are envisaged.

Mots-clés Agrovoc : agroforesterie, maladie des plantes, Pseudocercospora, Mangifera indica, Citrus, arbre d'ombrage, distribution spatiale, épidémiologie

Mots-clés géographiques Agrovoc : Cameroun

Mots-clés libres : Shade management, Agroforest system, Citrus, Plant epidemiology, Pseudocercospora angolensis

Classification Agris : H20 - Maladies des plantes
F08 - Systèmes et modes de culture

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Agences de financement hors UE : Institut de Recherche Agricole pour le Développement

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