Diversity of Pathogens and Symptoms Associated with Dieback on Passion Fruit in Kenya

Passion fruit is very important in Kenya as a source of nutrition and income. Currently, local demand for the fruit highly exceeds its supply. Diseases and pests are the most important constraints to passion fruit production. Among diseases, dieback has constantly been listed as one of the disease that requires highest priority in terms of management. The disease causes over 70% of total fruit losses in the country. With the goal of addressing the impact of dieback constraint on passion fruit production, research was carried out on the etiological and epidemiological aspects of the disease. The objective of this study was to identify the causal organisms of die-back. Samples of dieback infected passion fruit were collected from some passion fruit growing regions in Kenya and and transported to the laboratory for pathogen isolation. The most frequently occurring fungi were tested for pathogenicity on passion fruit. Of the fungi found associated with diseased passion fruit, Fusarium oxysporum, Fusarium semitectum, Fusarium solani, Phytophthora nicotianae, Alternaria passiflorae and Ascochyta spp. caused symptoms similar to those in the fields. These findings lay a foundation for identifying the passion fruit die-back complex and designing its managememt approach.
Le fruit de la passion est très important au Kenya en tant qu’une source de nutrition et de revenus. À l’heure actuelle, la demande locale pour le fruit dépasse de loin son offre. Les maladies et les ravageurs sont les contraintes les plus importantes pour la production des fruits de la passion. Parmi les maladies, le dépérissement a constamment été classé comme l’une des maladies qui exige la plus haute priorité en matière de gestion. La maladie provoque plus de 70% des pertes totales des fruits dans le pays. Dans le but d’atténuer l’impact de la contrainte de dépérissement sur la production des fruits de la passion, larecherche a été menée sur les aspects étiologiques et épidémiologiques de la maladie. L’objectif de cette étude est d’identifier les organismes responsables du dépérissement. Des échantillons des fruits de passion infectés par le dépérissement ont été recueillis dans certaines régions de croissance desfruits de la passion au Kenya et transportés au laboratoire pour l’isolement des agents pathogènes. Les champignons les plus fréquemment rencontrés ont été testés pour la pathogénie sur les fruits de la passion. De champignons trouvés associés avec les fruits de la passion malades, Fusarium oxysporum, Fusarium semitectum, Fusarium solani, Phytophthora nicotianae, Alternaria passiflorae et Ascochyta spp provoquent des symptômes semblables à ceux rencontrés dans les champs. Ces résultats jettent les bases de l’identification du complexede dépérissement desfruits de la passion et la conception de son approche de gestion.
Extended abstracts submitted under Integrated Crop Management
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East Africa
RUFORUM Conferences and Workshops
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The 2012 RUFORUM Biennial Conference is the third in the series. The main objective of the Biennial conferences is to provide a platform for agricultural research for development stakeholders in Africa and beyond to actively exchange findings and experiences, while at the same time learning lessons towards improving performance of the agricultural sector and ultimately people’s livelihoods. The biennial conference is RUFORUM’s most comprehensive meeting for the diversity of stakeholers in agriculture. It is especially dedicated to graduate students and their supervisors, grantees in RUFORUM member universities and alumni. It is a platform for peer review, quality control, mentorship, networking and shared learning. The third Biennial Conference was attended by 657 participants.This record contains an extended abstract accepted under the theme of Integrated Crop Management