Peanut_Smut_epidemiology.pdf

6b773b6e8a4b91ba503ac041b3a647c7?s=47 JUAN
June 18, 2020

 Peanut_Smut_epidemiology.pdf

6b773b6e8a4b91ba503ac041b3a647c7?s=128

JUAN

June 18, 2020
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  1. PEANUT SMUT PROJECT M.Sc. Juan Andrés Paredes Dr. M.Sc. Juan

    Pablo Edwards Molina Agr. Eng. Joaquín Monguillot Agr. Eng. Bruno Pugliese M.Sc. Florencia Asinari
  2. • Peanut production in Argentina • Characteristics of the disease

    • SPATIAL ANALYSIS: - Regional scale - Field scale ORDER OF PRESENTATION • Current situation of peanut smut
  3. Peanut production in Argentina https://datos.magyp.gob.ar/reportes.php?reporte=Estimaciones Province Planting area (ha) Production

    (t) Yield (kg/ha) Proportion (%) CORDOBA 333.770 902.294 2.914 90,1 LA PAMPA 14.100 45.650 3.869 4,6 SAN LUIS 9.950 42.075 4.229 4,2 SALTA 8.130 6.749 830 0,7 TOTALY 368.438 1.001.113 2.929
  4. Current situation Since 1995, peanut smut increased on intensity over

    the years Management strategies for disease control are not yet used It is currently the most worrying disease in the sector.
  5. Peanut smut (Thecaphora frezii)

  6. PEANUT SMUT - Thecaphora frezii - PEANUT CROP - Arachis

    hipogaea - PATHOSYSTEM
  7. CYCLE OF PATHOGENESIS Addapting Amorin et al., 2015. SURVIVAL DISPERSION

    REPRODUCTION COLONIZATION INFECTION Susceptible host PRIMARY CYCLE - High multiplication and generation of spores
  8. Disease assessment Incidence: Proportion of infected pods from a total

    sample (%) Severity: Proportion of damaged pod tissue. Diagrammatic scale representing five different severity classes (Astiz Gassó et al. 2008).
  9. SPORE PERSISTENCE

  10. Survival (preliminar assay) Inoculation in 2012 1500 teliospores/g of soil

    2012 - 2013 2013 - 2014 2014 - 2015 2015 - 2016 Incidencia Ind. Severidad 2012/13 2013/14 2014/15 2015/16 Campañas agrícolas 0,0 3,0 6,0 9,0 12,0 15,0 Incidencia (%) 0,00 0,10 0,20 0,30 0,40 0,50 Ind. Severidad (0-4) 12,6 10,0 9,9 8,1 0,41 0,31 0,30 0,26 12,6 10,0 9,9 8,1 0,41 0,31 0,30 0,26 A A A A Incidencia y severidad del carbón del maní Incidencia Ind. Severidad Incidence (%) Severity index (0-4) Severity index Incidence
  11. Pathogen cycle: Monocyclic disease since there is no secondary inoculum

    produced during the growing season.
  12. Polyetic since annual inoculum accumulation affects subsequent seasons. Peanut smut

    is: Monocyclic disease since there is no secondary inoculum produced during the growing season.
  13. SURVIVAL AND INCREMENT OF SPORES

  14. Increased of spores after crop

  15. 0 1000 2000 3000 4000 5000 6000 7000 8000 Inóculo

    inicial Inóculo final teliospores/g soil Increased teliospores Malatini Antinori Guardianelli Mainos Lavini RESULTS 11.9 16.7 31.9 32.2 36.6 0 1000 2000 3000 4000 5000 6000 7000 8000 Inóculo inicial Inóculo final teliospores/g soil Increased teliospores Malatini Antinori Guardianelli Mainos Lavini 2112 1990 1890 757 583 6670 5333 5000 2333 1660 Field 1 Field 2 Field 3 Field 4 Field 5 Increased 2,68X 2,64X 3,15X 3,10X 2,85X Increased spores after crop Final inoculum Initial inoculum
  16. Growing season Prevalence Reference North region Center region South region

    1995 Detection 1997 10% 2% 0% Marinelli et al., 2011 2006/07 12% 5% Oddino et al., 2008 2007/08 22% 8% 13% Oddino et al., 2008 2009/10 37% 22% Marinelli et al., 2011 2011/12 100% 100% 100% Cazzola et al., 2012 2015/16 100% 100% 100% Paredes et. al., 2016 2016/17 100% 100% 100% Paredes et. al., 2017 1995 Detection 1997 S/D S/D S/D 2006/07 0,02% 0,20% - 2007/08 0,02-20% 0,02-0,05% 0,02% 2009/10 0,5-55% 0,05-0,6% 2011/12 5,10% 2,04% 1,23% 2015/16 15,81% 3,21% 1,32% 2016/17 16,46% 4,69% 2,83% Incidence (average) Disease pregression
  17. SPATIAL ANALYSIS: REGIONAL SCALE

  18. Since 2014/15 to 2018/19 growing season Survey in peanut fields

  19. Peanut field - Sampling stations (diagonal transect) - Harvest the

    totality of plants in 1 m2 Peanut fields
  20. 400.000 ha Asinari et al., 2019 Peanut main growing region:

    disease incidence
  21. SPATIAL ANALYSIS: FIELD SCALE

  22. None
  23. None
  24. 20 m 1 m

  25. Peanut smut field incidence Field 1: 2% Field 3: 30%

    Field 2: XX%
  26. Thank you! Alejandro Rago Ignacio Cazón Juan Pablo Edwards Molina

    Joaquín Monguillot Cinthia Conforto Florencia Asinari