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Wheat Scab

Wheat Scab. Biology and Control. Dr. Roger Borges - UWEX Small Grain Specialist. SCAB (HEAD BLIGHT). Pathogen: Fusarium spp. Mostly Fusarium graminearum Symptoms: Usually first detected soon after flowering White head, while leaves and stems may remain green

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Wheat Scab

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  1. Wheat Scab Biology and Control Dr. Roger Borges - UWEX Small Grain Specialist This presentation is available at http://soybean.uwex.edu/

  2. SCAB (HEAD BLIGHT) Pathogen: Fusarium spp. Mostly Fusarium graminearumSymptoms: • Usually first detected soon after flowering • White head, while leaves and stems may remain green • Often, only part of the head is attacked • Bleached Spikelets often with a salmon-pink tint • Stem directly below the head may turn to chocolate brown color • Kernels above the infected spikelets may be shriveled • Kernels are shrunken and chalky or pink in color • Tombstone or light weight kernels • Barren spikelets • Mycotoxin This presentation is available at http://soybean.uwex.edu/

  3. SCAB SEVERITY AND FREQUENCY • Very erratic • Depends on wet weather conditions at flowering • Happened once every six or seven years in Wisconsin This presentation is available at http://soybean.uwex.edu/

  4. ALTERNATIVE HOSTS • Corn, oats, barley, sorghum, and other grasses • On corn, it causes root, stalk, and ear rot (giberela) • On sorghum, it causes stalk rot • May cause root rot in small grains This presentation is available at http://soybean.uwex.edu/

  5. ALTERNATIVE HOSTS • Mainly crop residue of small grains and corn • During moist weather, spores of the fungi are windblown or splashed onto the heads • Seed borne Fusarium spp may cause seedling blight This presentation is available at http://soybean.uwex.edu/

  6. INFECTION • From flowering to soft dough stage. • Mainly through anthers (flowers). Then grow into the kernels, glumes, or other parts of the head. • Favored by prolonged periods (48-72 hs) of high humidity and warm temperatures of 75-85 0F. This presentation is available at http://soybean.uwex.edu/

  7. HEAD EMERGENCE This presentation is available at http://soybean.uwex.edu/

  8. This presentation is available at http://soybean.uwex.edu/

  9. Flower Spikelets, row, or mesh This presentation is available at http://soybean.uwex.edu/

  10. This presentation is available at http://soybean.uwex.edu/

  11. This presentation is available at http://soybean.uwex.edu/

  12. This presentation is available at http://soybean.uwex.edu/

  13. This presentation is available at http://soybean.uwex.edu/

  14. This presentation is available at http://soybean.uwex.edu/

  15. SCAB MANAGEMENT • Variety selection: • Some varieties are extremely susceptible • No variety is considered highly resistant • Choose varieties based on scab ratings from multi-location! • Spread risk by choosing varieties with different maturities. • Crop rotation with non-host crops (i.e. soybeans) • Chop, bury, or remove crop residue This presentation is available at http://soybean.uwex.edu/

  16. SCAB MANAGEMENT • Seed treatments: • Help raise seed germination • May prevent or reduce seedling blight • DO NOT CONTROL HEAD BLIGHT • Seed cleaning • Set combine fans higher during harvest • Foliar fungicides • Not cost effective in Wisconsin This presentation is available at http://soybean.uwex.edu/

  17. THANK YOU! QUESTIONS? COMMENTS? This presentation is available at http://soybean.uwex.edu/

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