May 18, 2012 Wheat Pest and Disease Update

From Ned Tisserat, CSU Extension Specialist and Professor, Bioagricultural Sciences and Pest Management

Ned is sending out information concerning wheat diseases in the state on a routine basis. To subscribe to this email, please email Ned at Ned.Tisserat@ColoState.EDU.

I haven’t sent out an email for about 2 weeks concerning wheat diseases.   The reason is I have been waiting for the stripe rust to show up.  But it really hasn’t.  There are scattered reports of rust  in parts of the state, and there may be localized hot spots, but for the most part I think we have dodged the bullet.  This weekend it will cool off (better for stripe rust) but then it is forecast to heat back up (bad for stripe rust).  The other point is that the crop has developed much faster than in recent years.  Dr. Scott Haley indicated that in many areas this is the earliest he has seen the wheat flower.   Remember that there are restrictions on fungicide applications after flowering (or 30 days prior to harvest), so time is running short, even if you wanted to spray.

Viruses:

I don’t have hard data, but I think we are seeing more barley yellow dwarf this year.  In addition, we are testing a fair amount of wheat for Wheat Streak Mosaic and the New Triticum Mosaic virus.  Surveys over the last three years throughout the High Plains indicates that the newer (at least in terms of identification) is widespread but at a lower frequency than the more common wheat streak mosaic.  However the TrimV, as it is called, usually is found co-infecting with wheat streak mosaic virus.   The impact of this isn’t fully understood, but it might impact what resistance genes are incorporated into new varieties.

Ned Tisserat
Extension Specialist and Professor
Bioagricultural Sciences and Pest Management
Plant Sciences 1177
Ft. Collins CO 80523
Ned.Tisserat@colostate.edu
970-491-6527
970-491-3862 (FAX)

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