[Fhb-update_ma] FHB Update from MD, 05/08/12

[FHB Updates - Mid Atlantic SWW Region]

Several hot spots have developed in the last few days, where the forecasting system predicts a high to moderate risk of scab development in Maryland. Most wheat in the high risk regions in the central to southern part of MD should be past flowering. However, there may be a few late planted fields that have just reached flowering. The hot spots in the northern tier, especially in Cecil county should have wheat at or approaching flowering. The areas with a high risk forecast and wheat at flowering should consider a fungicide application. Stripe rust has also been confirmed in Dorchester and Caroline counties. If cool weather persists and frequent dew or rainy conditions develop during grain-fill, stripe rust can reach levels that will cause some low to moderate yield loss on susceptible varieties. Fungicides can only be applied to wheat up to mid-flower. The products registered for scab management, Prosaro and Caramba, are also effective against leaf and stripe rust. Rust susce
 ptible wheat varieties that are still eligible for a fungicide application (pre- or just at flower) and are not in a scab high risk forecast area may be sprayed with Folicur or a properly labeled generic tebuconazole product for rust control. Note that Prosaro, Caramba and Folicur have a 30 day Pre-Harvest Interval as well as the growth stage restriction. Tilt has a 45 day PHI, and therefore would only be an option on earlier stage wheat where the risk of scab was low.

 --Arv Grybauskas, Extension Plant Pathologist, University of Maryland

 For more details, go to the FHB Risk Assessment Tool at http://www.wheatscab.psu.edu/riskTool_2012.html