Disease risk perception and diversity of management strategies by farmers: The case of anthracnose caused by Colletotrichum gloeosporioides on water yams (Dioscorea alata) in Guadeloupe

Penet, Laurent; Barthe, Emilie Simone; Alleyne, Angela T.; Blazy, Jean-Marc

doi:10.1016/j.cropro.2016.05.005

Cited by 20 publications

(15 citation statements)

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“…In this polymorphism assessment, our strains were sampled from Dioscorea alata in Guadeloupe, where anthracnose is the main threat [14] and impacted agro-diversity [15] . Comparisons at wider geographical scales might enlighten important population processes: local dispersal [16] , up to migration at greater scales [17] , as well as genetic differentiation levels.…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Data on microsatellite markers in Colletotrichum gloeosporioides s.l., polymorphism levels and diversity range

et al. 2017

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Colletotrichum gloeosporioides is a species complex of fungi belonging to the Glomerellaceae family (Ascomycota). It has a global worldwide occurrence and while sometimes described as a plant endophytic commensal, it also often demonstrates pathogenicity on crops and is responsible for anthracnose disease in many cultivated species. Thirty-nine polymorphic microsatellites were isolated and their polymorphism levels were determined in 95 strains from Guadeloupe (Lesser Antilles), mostly isolated from Water Yam (Dioscorea alata). The average allele number per polymorphic locus was 12.3 (decreasing to 4.3 at 5% frequency threshold, indicative of dramatic amounts of rare polymorphisms), with a range of 2–29 alleles. The microsatellite markers data will facilitate genetic diversity analyses and population genetics studies for the species complex.

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Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Data on microsatellite markers in Colletotrichum gloeosporioides s.l., polymorphism levels and diversity range

et al. 2017

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“…Most other studies on farmers' knowledge and practices of crop diseases just show whether the farmers know the diseases and how they try to manage them. Little or no attention has been given to farmers' understanding of the pathogens that cause crop diseases (Abang et al 2014;Kromann et al 2014;Penet et al 2016;Schreinemachers et al 2015). Hence, this finding has considerable implications for future interventions aiming to enhance the capacity of farmers to manage crop diseases.…”

Section: The Influence Of Experiential Learning On Farmers' Knowledgementioning

confidence: 99%

Combining experiential and social learning approaches for crop disease management in a smallholder context: a complex socio-ecological problem

Tafesse

Mierlo

Leeuwis

et al. 2020

Socio Ecol Pract Res

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Effective management of crop diseases is a key precondition for sustainable crop production and to improve food security globally. However, learning approaches that improve smallholder farmers’ knowledge, perceptions, and practices to deal with crop diseases by fostering social and technical innovations are seldom studied. A study was conducted to examine: (1) how a combination of experiential and social learning approaches influences potato farmers’ knowledge, perceptions, and practices in bacterial wilt and its management in Ethiopia and (2) the implications of combining the two approaches for complex crop disease management in smallholder context. Data were derived from face-to-face in-depth interviews, reflective workshops, and participant observations. The findings showed that farmers’ knowledge and perceptions about disease incidence, the pathogen that causes the disease, its spreading mechanisms, host plants, and disease diagnosis were changed. Farmers’ practices in management of the disease were also improved. Learning about the cause of the disease stimulated the identification of locally relevant spreading mechanisms and the feasibility of a range of recommended disease management methods. Moreover, farmers recognized their interdependency, role, and responsibility to cooperate to reduce the disease pressure in their community. We conclude that learning interventions aiming to improve smallholder farmers’ knowledge, perceptions, and practices to deal with complex crop diseases need to combine experiential and social learning approaches and consider farmers’ local knowledge.

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“…It nevertheless impacted producers in a mixed fashion, and made some producers engage into strategical shift toward other species known to be more resistant, since producers cultivating more of these species currently also had greater rates of reported disease in the past ( Figure 6 ). The disease is known to have impacted varietal strategies by producers: it became an important concern and altered disease management practices, especially in producers with high varietal diversity (Penet et al, 2016), ever since local dispersal falls within natural rain dispersal range in fields (Penet et al, 2014). In summary, while diseases are thought of as the focal trigger of variety turn-over, there are other processes at play and diseases are actually more than mere drivers of varietal obsolescence via harvest decrease.…”

Section: Discussionmentioning

confidence: 99%

“…In 2014, we conducted interviews with a sample of 78 yam producers aimed at investigating their perception of anthracnose (Penet et al, 2016). Interviews were conducted with volunteer producers specifically agreeing for the interview, usually officially registered as yam growers by the Agriculture chamber, usually with prior commitment to participating in agronomic research and agricultural censuses, with full disclosure and educated informed prior consent with regard to the aims of the research project and use of resulting data, with guaranteed anonymization, respected confidentiality when requested and freedom to retract any time and without justification.…”

Section: Methodsmentioning

confidence: 99%

Varietal Dynamics and Yam Agro-Diversity Demonstrate Complex Trajectories Intersecting Farmers’ Strategies, Networks, and Disease Experience

et al. 2016

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Loss of varietal diversity is a worldwide challenge to crop species at risk for genetic erosion, while the loss of biological resources may hinder future breeding objectives. Loss of varieties has been mostly investigated in traditional agricultural systems where variety numbers are dramatically high, or for most economically important crop species for which comparison between pre-intensive and modern agriculture was possible. Varietal dynamics, i.e., turnover, or gains and losses of varieties by farmers, is nevertheless more rarely studied and while we currently have good estimates of genetic or varietal diversity for most crop species, we have less information as to how on farm agro-diversity changes and what cause its dynamics. We therefore investigated varietal dynamics in the agricultural yam system in the Caribbean island of Guadeloupe. We interviewed producers about varieties they cultivated in the past compared to their current varieties, in addition to characterizing yam cropping characteristics and both farm level and producers socio-economic features. We then used regression tree analyses to investigate the components of yam agro-diversity, varietal dynamics and impact of anthracnose on varieties. Our data demonstrated that no dramatic loss of varieties occurred within the last decades. Cultivation changes mostly affected widespread cultivars while frequency of uncommon varieties stayed relatively stable. Varietal dynamics nevertheless followed sub-regional patterns, and socio-economic influences such as producer age or farm crop diversity. Recurrent anthracnose epidemics since the 1970s did not alter varietal dynamics strongly, but sometimes translated into transition from Dioscorea alata to less susceptible species or into a decrease of yam cultivation. Factors affecting changes in agro-diversity were not relating to agronomy in our study, and surprisingly there were different processes delineating short term from long term varietal dynamics, independently of disease risk. Our results highlighted the importance of understanding varietal dynamics, an often overlooked component of agriculture sustainability, in addition to evolutionary forces shaping agro-diversity and genetic diversity distribution within crops. It is also crucial to understand how processes involved do scale up worldwide and for different crop species, so as not to mislead on-farm conservation efforts and efficacy of agro-diversity preservation.

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Disease risk perception and diversity of management strategies by farmers: The case of anthracnose caused by Colletotrichum gloeosporioides on water yams (Dioscorea alata) in Guadeloupe

Cited by 20 publications

References 56 publications

Data on microsatellite markers in Colletotrichum gloeosporioides s.l., polymorphism levels and diversity range

Data on microsatellite markers in Colletotrichum gloeosporioides s.l., polymorphism levels and diversity range

Combining experiential and social learning approaches for crop disease management in a smallholder context: a complex socio-ecological problem

Varietal Dynamics and Yam Agro-Diversity Demonstrate Complex Trajectories Intersecting Farmers’ Strategies, Networks, and Disease Experience

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