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Fusarium head blight (or scab) can reduce yields in wheat from floret sterility and poor seed filling. Traces of the mould on the seeds results in downgrading. The fusarium fungus also produces toxins in wheat and barley that can be harmful to humans and livestock.
Wheat, barley, oats
Fusarium head blight overwinters in soil, grass and crop residue as well as in the seed. Seedlings may become infected at emergence. Spores are produced first on stem infections at the base of the plant. These spores are spread by rain or wind to infect flower parts, glumes or other portions of the head. Infections are most frequent and severe at anthesis.
Head blight is recognized by premature bleaching of some or all of the spikelets in the head. The infected spikelets are often sterile. The seed in spikelets, above the point of infection may not develop. Diseased heads exhibit fungal growth with an orange to pinkish tinge. Infected grain is shrivelled and lighter in weight. Individual kernels are usually whitish in colour.
As warm, moist weather develops, spores that are spread by rain splash and wind infect the florets. Continuous moisture and warm weather (25-30 degrees C or 77-86 degrees F) are needed for infection when the grain is flowering.
Blight symptoms develop within 3 days after infection if environmental conditions are favourable. Infected heads ripen prematurely. If the stem of the seed head is infected, everything above that point will be white.
Look for a ring of pink or salmon colour at the base of the florets. Only partially-filled seeds will be found in the infected spikelets. Shrivelled grains may appear tan to white, with traces of pink on the seeds.
For further information, contact your GO representative.