Today's Date: 2016-05-28

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Scab Epidemic Risk Model 

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Plant Pathologist Commentary: Small Grains Disease Update 07/16/2015

Fusarium Head Blight (Scab)

Wheat is reaching between the late milk and early dough stages through southern, south central and Northwest Minnesota. Awn infections of FHB have been noticeably high in commercial fields prior to seeing visible symptoms of infected spikelets. Symptoms of FHB infections in spikelets in hard red spring wheat have developed quickly. Incidence in scouted fields has ranged from 35-96% with most fields ranging between 30-40% incidence. Incidences of FHB in spring wheat trials in central Minnesota have also been high from 30-60% depending on the variety. Severity in commercial fields has been in the 10-30% range. There have also been reports of several fields of rye with FHB symptoms in southern Minnesota.

Stripe Rust

Stripe rust infection is now tailing off in large portions of Minnesota. Varieties such as Prosper adn Faller are likely to have been some of the hardest hit varieties in Minnesota as these varieties are more susceptible to stripe rust.

Bacterial Leaf Streak (BLS)

Bacterial leaf streak is now evident in many fields throughout the state at incidences ranging between 40-100%. The presence of this diseases has probably been exacerbated by the stormy weather in the last few weeks which has provided the moisture and mechanical damage to plants in the form of wind and hail required for the bacteria to take hold. Growers who notice BLS is a problem in their wheat or barley should consider growing a more resistant variety the next time they are growing small grains in that particular field. Avoid growing varieties listed as highly susceptible to BLS in the Minnesota Variety trial bulletin. BLS can also cause symptoms on heads known as black chaff. BLS can lead to brown discolouration on the peduncle and dark brown to black stripes on awns and glumes. Head infections seem more common if the disease has moved up to the flag leaf.

Important Note Important Note: Please review Terms of Use before utilizing this site. This Fusarium Head Blight (FHB, or 'scab') model is a pre-flowering model. It is meant to be applied using weather conditions during the week leading up to flowering. Therefore, the epidemic risk for a particular field should be determined by selecting a time coinciding with or just prior to the initiation of flowering in that field. A growth stage estimator is available on this website, but you should still monitor growth in your own fields to better estimate the date on which flowering begins.