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Wheat disease update – May 3, 2013
Author: Arkansas Row Crops

Stripe rust is still increasing on susceptible varieties at locations where it blew in during the spring. The most susceptible varieties are Arcadia, Progeny 117, Progeny 185, and USG 3993. Except for a few fields, stripe rust does not appear to be having a significant impact on yield because of adult-plant resistance and one or two fungicide applications.

Septoria leaf blotch had been confined to lower leaves but is now moving higher up the plant and can still do a lot of damage between now and harvest. It is important to protect the flag and flag-1 leaves from infection for as long as possible during grain fill.

Fusarium head blight (scab) does not appear to be a threat because of low temperatures. A fungicide application specifically for head blight is not recommended at this time.

Barley yellow dwarf is widespread and severe is some fields. Nothing can be done to prevent losses from BYD at this time.

Downy mildew has become more evident in portions of fields that were flooded earlier. The only control is to prevent the flooding.

Leaf rust has been rumored to be present at low levels in south Arkansas, but I have not seen any or talked to anyone who has seen any.

Flowering is the latest growth stage to apply a fungicide, and many fields are at or near flowering. Assuming that any stripe rust has already been taken care of, an application for Septoria leaf blotch is the most likely to provide a positive economic return.

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