# Designing innovative spatial strategies to control black leaf streak disease of banana through modelling approach

Catherine Abadie, Eduardo Corrales, Béranger Decouture, Marta Zaffaroni,

Jean-François Rey, José Guzmán, Edgar Valverde, Nancy Chaves, Loup

Rimbaud

► To cite this version:

Catherine Abadie, Eduardo Corrales, Béranger Decouture, Marta Zaffaroni, Jean-François Rey, et al. Designing innovative spatial strategies to control black leaf streak disease of banana through modelling approach. XXIV Congreso International Acorbat, Apr 2024, Mexico, Mexico. hal-04608136

HAL Id: hal-04608136

https://hal.inrae.fr/hal-04608136

Submitted on 11 Jun 2024

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<figure><img src="image_1.png" /></figure>

Distributed under a Creative Commons Attribution 4.0 International License
# Designing innovative spatial strategies to control black leaf streak disease of banana through modelling approach

Catherine Abadie, Eduardo Corrales, Béranger Decouture, Marta Zaffaroni, Jean-François Rey, José Guzmán, Edgar Valverde, Nancy Chaves, Loup Rimbaud

<figure><img src="image_1.png" /></figure>

## To cite this version:

Catherine Abadie, Eduardo Corrales, Béranger Decouture, Marta Zaffaroni, Jean-François Rey, et al. Designing innovative spatial strategies to control black leaf streak disease of banana through modelling approach. XXIV Congreso International Acorbat, Apr 2024, Mexico, Mexico. hal-04608136

HAL Id: hal-04608136

https://hal.inrae.fr/hal-04608136v1

Submitted on 11 Jun 2024

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.

L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

<figure><img src="image_2.png" /></figure>

Distributed under a Creative Commons Attribution 4.0 International License
# DESIGNING INNOVATIVE SPATIAL STRATEGIES TO CONTROL BLACK LEAF STREAK DISEASE OF BANANA THROUGH MODELLING APPROACH

Catherine **Abadie**¹,²,⁵, Eduardo Corrales², Béranger Decouture¹,², Marta Zaffaroni³, Jean-François Rey³, José Guzmán⁴, Edgar Valverde⁴, Nancy Chaves⁴, Loup Rimbaud³.

<figure><img src="image_2.png" /></figure>

¹CIRAD-PHIM, Costa Rica; ²CATIE, Turrialba, Costa-Rica; ³INRAE, Avignon, France; ⁴CORBANA, Costa-Rica;

⁵PHIM, University of Montpellier, CIRAD, INRAE, Institut Agro, IRD, F-34398 Montpellier, France

**Objectives.** As experimentations are not possible at large scale, the aim of the study is to assess the efficacy of innovative strategies to reduce fungicide use to manage Black Leaf Streak Disease (BLSD) of banana by using a modeling approach. Two different spatio-temporal strategies are evaluated on a real production landscape : (i) one directly based on fungicide strategies ; (ii) one based on the cultivation of resistant cultivars

## Methods

The generic epidemiological spatially-explicit model *landsepi* (Rimbaud et al., 2018) was adapted to simulate BLSD by modifying plant growth to banana and 30 BLSD parameters. 52 spatial-temporal strategies were defined (Figure 1) to **reduce the index of fungicide treatments**: (1) with a **direct fungicide reduction** by reducing application *frequency* (5,10,15,20 days), the **dose** (25,50,75, 100%) or the **spatial coverage** (in line, at 25, 50, 75, 100%) representing 160 combinations of scenarios ; (2) by replacing the susceptible commercial variety by **resistant varieties** in 3 spatial allocations (**line**, **mosaic or mixture**) and modifying the 4 **resistance genes efficacies** representing 288 combinations. Each combinations was simulated 30 times on a real 347-ha banana production basin (Finca San Pablo in Costa-Rica, Figure 2). The exported yield and BLSD severity (Area Under Disease Curve Progress) provided by the simulated scenarios during 10 years will be compared.

<figure><img src="image_3.png" /><figcaption>**Fig. 1.** 488 combinations of scenarios to reduce fungicides (i) by reducing fungicide coverage, application frequency and fungicide doses, (ii) by using resistant varieties in line, mosaic or in mixture with susceptible variety. White and orange polygons represent non-treated and treated plots (with fungicide application or using cultivar resistance).</figcaption></figure>

## Results. The model simulates realistic curves.

The parametrization of the *landsepi* model for BLSD allowed to obtain realistic curves of dynamics of the 4 compartments (Healthy, Latent, Infectious, Removed) with BLSD severity of 0,38 and an exported yield of 0,2 t.ha⁻¹.season⁻¹ for 100% susceptible variety without any fungicide (Fig. 3)

<figure><img src="image_4.png" /><figcaption>**Fig. 2:** Aerial photography of the Finca San Pablo with 295 plots (347ha), Costa-Rica</figcaption></figure>

Epidemic dynamics

<figure><img src="image_5.png" /><figcaption>**Fig 3: BLSD dynamics in 347 ha of susceptible banana without control during 5 years.**</figcaption></figure>

**Perspectives.** The **13440 simulations outputs** are statistically analysed to allow to identify at 350 ha scale the **best scenarios of direct and indirect fungicide reduction** to manage BLSD while sustaining acceptable yields.
# DESIGNING INNOVATIVE SPATIAL STRATEGIES TO CONTROL BLACK LEAF STREAK DISEASE OF BANANA THROUGH MODELLING APPROACH

Catherine **Abadie**¹,²,⁵, Eduardo Corrales², Béranger Decouture¹,², Marta Zaffaroni³, Jean-François Rey³, José Guzmán⁴, Edgar Valverde⁴, Nancy Chaves⁴, Loup Rimbaud³.

<figure><img src="image_3.png" /></figure>

¹CIRAD-PHIM, Costa Rica; ²CATIE, Turrialba, Costa-Rica; ³INRAE, Avignon, France; ⁴CORBANA, Costa-Rica;

⁵PHIM, University of Montpellier, CIRAD, INRAE, Institut Agro, IRD, F-34398 Montpellier, France

**Objectives.** As experimentations are not possible at large scale, the aim of the study is to assess the efficacy of innovative strategies to reduce fungicide use to manage Black Leaf Streak Disease (BLSD) of banana by using a modeling approach. Two different spatio-temporal strategies are evaluated on a real production landscape : (i) one directly based on fungicide strategies ; (ii) one based on the cultivation of resistant cultivars

## Methods

The generic epidemiological spatially-explicit model *landsepi* (Rimbaud *et al.*, 2018) was adapted to simulate BLSD by modifying plant growth to banana and 30 BLSD parameters. 52 spatial-temporal strategies were defined (Figure 1) to **reduce the index of fungicide** treatments: (1) with a **direct fungicide reduction** by reducing application *frequency* (5,10,15,20 days), the *dose* (25,50,75, 100%) or the *spatial coverage* (in line, at 25, 50, 75, 100%) representing 160 combinations of scenarios ; (2) by replacing the susceptible commercial variety by **resistant varieties** in 3 spatial allocations (*line*, *mosaic* or *mixture*) and modifying the 4 *resistance genes efficacies* representing 288 combinations. Each combination was simulated 30 times on a real 347-ha banana production basin (Finca San Pablo in Costa-Rica, Figure 2). The exported yield and BLSD severity (Area Under Disease Curve Progress) provided by the simulated scenarios during 10 years will be compared.

<figure><img src="image_4.png" /><figcaption>**Fig. 1.** 488 combinations of scenarios to reduce fungicides (i) by reducing fungicide coverage, application frequency and fungicide doses, (ii) by using resistant varieties in line, mosaic or in mixture with susceptible variety. White and orange polygons represent non-treated and treated plots (with fungicide application or using cultivar resistance).</figcaption></figure>

## Results. The model simulates realistic curves.

The parametrization of the *landsepi* model for BLSD allowed to obtain realistic curves of dynamics of the 4 compartments (Healthy, Latent, Infectious, Removed) with BLSD severity of 0,38 and an exported yield of 0,2 t.ha⁻¹.season⁻¹ for 100% susceptible variety without any fungicide (Fig. 3)

<figure><img src="image_5.png" /><figcaption>**Fig. 2:** Aerial photography of the Finca San Pablo with 295 plots (347ha), Costa-Rica</figcaption></figure>

Epidemic dynamics

<figure><img src="image_6.png" /><figcaption>**Fig 3:** BLSD dynamics in 347 ha of susceptible banana without control during 5 years.</figcaption></figure>

**Perspectives.** The **13440 simulations outputs** are statistically analysed to allow to identify at 350 ha scale the **best scenarios of direct and indirect fungicide reduction** to manage BLSD while sustaining acceptable yields.