A Computer-based Decision Support System for
Septoriosis Control in Winter Wheat: implementation in
Belgium and Grand-Duchy of Luxemburg.
El JARROUDI Moussa and TYCHON Bernard
Agrometeorological Research Group
2 The optimum time of fungicide application Modelling Cultivar-Topo-climatological conditions-Parasite
Use of statistical tools and Software packages for diseases management
Winter wheat field
Water table
Spraying
The risk of strain’s resistance Bees Socio-economic Target Warnings Concern of the environment
Why to set up a decision support system for diseases control in wheat?
Financial and
INPUT
Infection Periods (hours)
Latent period The number of such
hours per day are then added up and all further estimations are based on
daily data • > 0.1 mm in 1st H • > 0.5 mm in the 2nd H • RH > 60% for 19 H • T >4°C for 48 H • Calculated by polynomial equation (SHAW, 1990) • Relationship between latent period and t°
The evolution of the latent period is calculated daily on the
basis of mean daily temperature and summed up to 100% Estimation of the disease
progression on the upper Estimation of primary and
secondary infection Graph
Crop sowing date Hourly weather data and phenological stages
Calculation with the phyllochron principle
(130 degree.days)
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PROCULTURE OUTPUTS
PROCULTURE OUTPUTS
Forecast of the percentage of the area covered by sporulating S. tritici (beige: Primary infection, brown: Secondary infection
Leaf area development Percentage of the leaf area covered by sporulating S.tritici (Pink: Primary infection, red: secondary infection)
Logarithmic scale
Sowing date
Rainfall (mm)
Temperature (°C
)Calculated leaf natural
senesence
Relative humidity (%)
Date
Forecast of the latency
duration according to
temperature
Automatic
weather
stations
• > 0.1 mm in 1st H • > 0.5 mm in the 2nd H • RH > 60% for 19 H • T >4°C for 48 H6
The Proculture decision-making
Everlange 2006- Akteur
Reuler 2006- Dekan
Preceding crop: Maize
The Proculture decision-making
Warning canceled
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4. Juni 2007
4. Juni 2007
Weekly crop state, juin 4, 2007Cultivar: Tommi Preceding crop: Maize Sowing date: 12.10.06 Growth stage: GS69
Septoria tritici: Symptoms on F1, F2 and F3.
Brown rust: Symptoms on F1, F2 and F3.
Sorte: CUBUS
Preceding crop: Canola seed Sowing date: 11.10.06 Growth stage: GS75
Septoria tritici: Symptoms on F1, F2 and F3.
Brown rust: Symptoms on F1, F2 and F3. Cultivar: Akteur
Preceding crop: Maize Sowing date: 7.10.06 Growth stage: GS65
Septoria tritici: Symptoms on F1, F2 and F3
Brown rust: symptoms on F1, F2 and F3
Yellow rust: Two focus of yellow rust were observed.
Cultivar: AKTEUR Preceding crop: Pea Sowing date: 10.10.06 Growth stage: GS70
Septoria tritici: Symptoms on F1, F2 and F3.
Cultivar: ACHAT Preceding crop: Pea Sowing date: 10.10.06 Growth stage: GS69+
Septoria tritici: Symptoms on F1, F2 and F3.
Cultivar: FLAIR Preceding crop: Pea Sowing date: 10.10.06 Growth stage: GS72
Septoria tritici: Symptoms on F1, F2 and F3.
Brown rust: Symptoms on F1, F2 and F3.
This week, very important symptoms were observed on F1 leaves. These symptoms exceeded 20 % infection for some F1 leaves. The mid-May rainfall is the cause of this infection, probably due to spores stemming from Mycosphearella graminicola ascospores. The end of May sweet night-temperatures were very favorable to the brown rust germination. Rains registered in the flowering stage provided convenient conditions for the fusarium head blight. Finally, the foci of yellow rust were observed for the first time at Reuler.
L ef a re a d ev el op m en t
Proculture
Proculture
Septoriosis Model
Septoriosis Model
CERES
CERES
Module of leaf rust
Module of leaf rust
Coupling of phyllochron
Coupling of phyllochron
and latent period
and latent period
Yield
Yield
Simulation functions of the kinetics of degradation
of the green surface
Coupling of CERES and
Coupling of CERES and
PROCULTURE
PROCULTURE
Calculation of the useful green surface and disturbances bound to leaf rust (Puccinia triticina)
and Septoria tritici blotch To provide an optimum time
frame for site-specific spraying and distribute these
results in real-time to the farming community. Estimation of fungicides residues Impact of fungicides on water and soils. To establish the economic
and environmental threshold of fungicides application AUDPC HAD HAA AUVDPC PAD PAA Partners Ulg INRA
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