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Borges, © 2002-2005 University of Wisconsin – Agronomy This presentation is available at

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1 Borges, © University of Wisconsin – Agronomy This presentation is available at

2 Borges, © University of Wisconsin – Agronomy This presentation is available at Pathogen: Fusarium spp. Mostly Fusarium graminearum Symptoms: 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 SCAB (HEAD BLIGHT)

3 Borges, © University of Wisconsin – Agronomy This presentation is available at Very erratic Depends on wet weather conditions at flowering Happened once every six or seven years in Wisconsin SCAB SEVERITY AND FREQUENCY

4 Borges, © University of Wisconsin – Agronomy This presentation is available at 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 ALTERNATIVE HOSTS

5 Borges, © University of Wisconsin – Agronomy This presentation is available at 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 ALTERNATIVE HOSTS

6 Borges, © University of Wisconsin – Agronomy This presentation is available at 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 ( hs) of high humidity and warm temperatures of F. INFECTION

7 Borges, © University of Wisconsin – Agronomy This presentation is available at HEAD EMERGENCE

8 Borges, © University of Wisconsin – Agronomy This presentation is available at

9 Borges, © University of Wisconsin – Agronomy This presentation is available at Spikelets, row, or mesh Flower

10 Borges, © University of Wisconsin – Agronomy This presentation is available at

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15 Borges, © University of Wisconsin – Agronomy This presentation is available at 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 SCAB MANAGEMENT

16 Borges, © University of Wisconsin – Agronomy This presentation is available at 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 SCAB MANAGEMENT

17 Borges, © University of Wisconsin – Agronomy This presentation is available at


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