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Soybean seedling disease study

Soybean seedling disease study. Funded by. Stand count is important. Reduced stands = reduced yield potential. The reduction in stand was achieved by random placement of 12-inch gaps within rows 2 to 4 weeks after planting ( Source: University of Illinois ). What affects stand establishment?.

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Soybean seedling disease study

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  1. Soybean seedling disease study Funded by

  2. Stand count is important Reduced stands = reduced yield potential The reduction in stand was achieved by random placement of 12-inch gaps within rows 2 to 4 weeks after planting (Source: University of Illinois)

  3. What affects stand establishment? • Compaction • Flooding • Crusting • Seedling diseases • Planting depth • Cold stress • Residue coverage • Sidewall compaction • Dry soils • Herbicide injury • Poor seed quality • Low germination

  4. What affects stand establishment? • Compaction • Flooding • Crusting • Seedling diseases • Planting depth • Cold stress • Residue coverage • Sidewall compaction • Dry soils • Herbicide injury • Poor seed quality • Low germination

  5. Seedling diseases Pre- and post-emergent ‘damping off’ Causal organisms: Pythium species Phytophthora sojae Rhizoctonia solani Fusarium species

  6. Oomycetes vs fungi Oomycetes Phytophthora sojae, Pythium species True fungi Fusarium species, Rhizoctonia solani Cell wall composed of chitin Cross walls in hyphae Haploid nuclei in vegetative state Air- or splashed- dispersed spores More closely related to animals • Cell wall composed of cellulose • No cross walls in hyphae • Diploid nuclei in vegetative state • “Swimming” spores • More closely related to brown algae and diatoms

  7. Oomycetes vs fungi Oomycetes Phytophthora sojae, Pythium species True fungi Fusarium species, Rhizoctonia solani

  8. Conditions for disease development

  9. Managing soybean seedling disease • Good seedbed conditions • Seed treatments • “What's on your seed?” available from • http://ipcm.wisc.edu/ • Resistance

  10. Seed treatments E = excellent; G = good; F = fair; P = poor N = none

  11. Survey of soybean seedling diseases

  12. Isolates or soil received from 12 states *Soil samples collected, isolates will be baited; **Not including mid-season isolates; *** Isolates collected being purified

  13. Oomycetespecies diversity 43 Pythium species 2 Phytophthora species

  14. Acknowledgements • Extension Network – Oomycete collections • NIFA funded 2011 to 2015 • NCSRP and USB funding 2012 to 2014 • MSU - Project GREEEN funded 2011

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