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Wheat scab update for late May

Wheat is now flowering in parts of central Ohio and will continue to flower in more northern counties later this week and into next week. According to the FHB forecasting system (http://www.wheatscab.psu.edu/), the risk for scab was low in central and northern Ohio for fields flowering earlier this week.

Although it rained fairly consistently in mid May, conditions were relatively cool last week, which likely reduced the risk of the scab fungus infecting the wheat spikes. Scab develops best under moderate to warm temperatures and humid conditions. Continue to keep your eyes on the weather and the forecasting system over the next week or so as there is rain in the forecast and warmer temperatures.

Fields flowering at the end of this week or early next week (May 25-30) may still be at risk for scab. Prosaro and Caramba are the two fungicides recommended for head scab control. Stay away from the strobilurins when the risk for scab is high as they have been linked to higher grain contamination with vomitoxin. Click on the links below to see updated factsheet # PLPATH-CER-06 for more on head scab of wheat and barley and factsheet # PLPATH-CER-03 for guidelines on how to use and interpret the scab forecasting system.

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