Qualitative Dynamics of the Coffee Rust Epidemic: Educating Intuition with Theoretical Ecology

Vandermeer, John; Jackson, Doug; Perfecto, Ivette

doi:10.1093/biosci/bit034

Cited by 35 publications

(30 citation statements)

References 27 publications

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“…A second shock of the same magnitude as in 2012 would have further deteriorated the productive output and social situation of those affected, which had already been seriously impacted. Although pesticides are known to be detrimental to the natural enemies of coffee rust, such as the fungus Lecanicillium lecanii (Staver et al 2001), these extreme actions were driven by the seriousness of the emergency, indicating that coffee rust management possibly needs to be rethought especially under the threat of progressive climate change (Vandermeer et al 2014). A state of emergency was declared in Costa Rica, Honduras and Guatemala, which allowed the Costa Rican coffee sector to access national funds to fight the disease: MAG (Ministerio de Agricultura y Ganadería) and ICAFE donated fungicides to smallholders worth USD 3.7 million.…”

Section: Immediate Responsesmentioning

confidence: 99%

“…Short-term responses must obviously be complemented with long term actions to prevent rather than cure, particularly under progressive climate change. A systems approach to manage this disease, and other pests and diseases, which have no clear genetic solution, is probably needed (Lewis et al 1997;McRoberts et al 2003;Vandermeer et al 2014). The goal should be to structure and manage coffee systems to maximize their preventive strengths, by enhancing multiple ecological control mechanisms (Avelino et al 2011).…”

Section: Developing Ecological Control Of Coffee Rustmentioning

confidence: 99%

See 1 more Smart Citation

The coffee rust crises in Colombia and Central America (2008–2013): impacts, plausible causes and proposed solutions

Cristancho²,

et al. 2015

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Section: Immediate Responsesmentioning

confidence: 99%

Section: Developing Ecological Control Of Coffee Rustmentioning

confidence: 99%

The coffee rust crises in Colombia and Central America (2008–2013): impacts, plausible causes and proposed solutions

Cristancho²,

et al. 2015

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“…However, the recent epidemic of coffee rust ( H e m i l e i a v a s t a t r i x ) from Mexico to Peru has been particularly severe, with some reports anticipating a reduction in yield (40%-50%) over the entire region, which will potentially affect many coffee production nations in Latin America (Cressey, 2013). For example, Vandermeer, Jackson, and Perfecto (2014) reported that over 60% of the plants in an experimental plot in Mexico experienced >80% defoliation and nearly 9% died, and similar patterns have been reported anecdotally from across the region (Cressey, 2013).…”

Section: Introductionmentioning

confidence: 61%

Gamma radiosensitivity of coffee (Coffea arabica L. var. typica)

Quintana

Alvarado

Saravia

et al. 2019

Peruvian Journal of Agronomy

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The effects of gamma radiation on the germination, survival, and morphological damage in characteristics of the M1 generation of coffee (Coffea arabica L. var. typica) plants was evaluated using seeds collected from Santa Teresa and Chaupimayo, Peru. Under net house, the percentage of germination was 68%, 35%, 10%, and 0% for the Santa Teresa seeds and 75%, 49%, 17% and 0% for the Chaupimayo seeds with irradiation treatments of 0, 50, 100 and 150 Gy, respectively, whereas under laboratory conditions, germination levels were between 70% and 94% across all treatments. The survival rate also decreased with increasing radiation levels, with values of 45%, 32%, 28%, and 10% in the laboratory and 29%, 9%, 6%, and 0% in the net house for the Santa Teresa seeds and 58%, 45%, 38%, and 8% in the laboratory and 42%, 15%, 7%, and 0% in the net house for the Chaupimayo seeds with irradiation treatments of 0, 50, 100, and 150 Gy, respectively. Morphological changes were observed in the plants that survived irradiation at a dose of 100 Gy in terms of the leaf shape, leaf apex shape, young leaf color, plant height, stem diameter, number of leaves per plant, leaf length, leaf width, and distance from the cotyledon to the first node. ResumenSe evaluó los efectos de la radiación gamma sobre la germinación, la supervivencia y características morfológico de plantas de café de generación M1 (Coffea arabica L. var. typica), utilizando semillas colectadas de Santa Teresa y Chaupimayo, Perú. En casa malla, el porcentaje de germinación fue del 68%, 35%, 10% y 0% para las semillas de Santa Teresa y 75%, 49%, 17% y 0% para las semillas de Chaupimayo con tratamientos de irradiación de 0, 50, 100 y 150 Gy, respectivamente, mientras que en condiciones de laboratorio, los niveles de germinación fueron entre 70% y 94% en todos los tratamientos. El porcentaje de supervivencia también disminuyó con el aumento de los niveles de radiación, con valores de 45%, 32%, 28% y 10% en el laboratorio y 29%, 9%, 6% y 0% en la casa malla para las semillas de Santa Teresa y 58 %, 45%, 38% y 8% en el laboratorio y 42%, 15%, 7% y 0% en la casa malla para las semillas de Chaupimayo con tratamientos de irradiación de 0, 50, 100 y 150 Gy, respectivamente. Se observaron cambios morfológicos en las plantas que sobrevivieron a la irradiación a una dosis de 100 Gy en características como forma y ápice de la hoja, color de la hoja joven, altura de la planta, diámetro del tallo, número de hojas por planta, longitud de la hoja, ancho de la hoja y distancia del cotiledón al primer nudo.

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“…The predatory and traitmediated interactions that cascade through different pathways from the fly to the coffee scale can ultimately lead to one of two attractors (local exuberant coffee scale colonies and local coffee scale extinction). The theoretical and empirical relations between coffee scale and rust dynamics are even more complex, and are explored in Vandermeer et al (2014) and McCook and Vandermeer (2015).…”

Section: The Azteca Autonomous Pest Management Networkmentioning

confidence: 99%

The Azteca Chess experience: learning how to share concepts of ecological complexity with small coffee farmers

Garcı́a-Barrios¹,

Cruz-Morales²,

Vandermeer³

et al. 2017

E&S

Self Cite

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ABSTRACT. Small-scale coffee farmers understand certain complex ecological processes, and successfully navigate some of the challenges emerging from the ecological complexity on their farms. It is generally thought that scientific knowledge is able to complement farmers' knowledge. However, for this collaboration to be fruitful, the gap between the knowledge frameworks of both farmers and scientists will need to be closed. We report on the learning results of 14 workshops held in Chiapas, Mexico during 2015 in which 117 small-scale coffee farmers of all genders (30% women) and ages who had little schooling were exposed by researchers to a natural history narrative, a multispecies network representation, a board game, and a series of graphical quizzes, all related to a nine-species complex ecological network with potential for autonomous control of the ongoing and devastating coffee rust epidemic that was affecting them. Farmers' retention and understanding of direct and indirect bilateral interactions among organisms was assessed with different methods to elucidate the effect of adding Azteca Chess gaming sessions to a detailed and very graphical lecture. Evaluation methods that were better adapted to farmers' conditions improved learning scores and showed statistically significant age effect (players older than 40 had lower retention scores) and gaming effect (lower retention of interactions included in the lecture but not in the game). The combination of lecture and game sessions helped participants better understand cascades of trait-mediated interactions. Participants' debriefings confirmed qualitatively that they learned that beneficial organisms and interactions occur on their farms, and that gaming was enjoyable, motivating, and critical to grasp complex interactions. Many of the farmers concluded that the outcome of these interactions is not unique and not always in favor of rust control but is context dependent. Many concluded that there are feasible things they can do on their farms, derived from what they learned, to favor potential autonomous pest control.

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Qualitative Dynamics of the Coffee Rust Epidemic: Educating Intuition with Theoretical Ecology

Cited by 35 publications

References 27 publications

The coffee rust crises in Colombia and Central America (2008–2013): impacts, plausible causes and proposed solutions

The coffee rust crises in Colombia and Central America (2008–2013): impacts, plausible causes and proposed solutions

Gamma radiosensitivity of coffee (Coffea arabica L. var. typica)

The Azteca Chess experience: learning how to share concepts of ecological complexity with small coffee farmers

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