1 / 17

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

estellew
Télécharger la présentation

Wheat Scab

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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/

More Related