Friday, April 22, 2016

Check out the latest "Wheat Science News"

The UK Wheat Science Group would like to invite you to check out the latest issue of the "Wheat Science News".

Included in this issue: Importance of Wheat Growth Stages • 2016 Kentucky Wheat Vomitoxin Survey Form • Wheat Outlook and Profitability Potential • Fungicide Efficacy Table for Wheat Diseases • Introduction of Dr. Raul Villanueva & Dr. John Grove • Upcoming Events for 2016

Visit the UK Wheat Science Group webpage for past issues of the newsletter and other wheat related information.


Colette Laurent, UK Grain Crops Coordinator

The annual UK WHEAT FIELD DAY is slated for Tuesday May 10, 2016 at the UK Research and Education Center in Princeton, KY.
Registration will begin at 8:00 am (CDT).  The tours will end at noon and field day will conclude with a lunch sponsored by the Kentucky Small Grain Growers Association.

Field Day Topics Include:

Thursday, April 7, 2016

Be on the Lookout for Wheat Rust Diseases

Carl A. Bradley, Extension Plant Pathologist, University of Kentucky

Stripe rust (Fig. 1) was diagnosed by the Plant Disease Diagnostic Laboratory at the UKREC this week in a wheat sample that came from Lyon County.  In addition, leaf rust (Fig. 2) of wheat has been observed in states south of Kentucky (Arkansas and Mississippi), and appears to be moving northward.  Some wheat varieties have high levels of resistance to these diseases; therefore, it is important to know the susceptibility of the varieties planted. Resistant varieties likely will not require any additional management for rust disease control; however, a foliar fungicide application may need to be considered for susceptible varieties. The 2016 multi-state university foliar fungicide efficacy table for wheat diseases can be found here:

Monday, March 21, 2016

Canola Freeze Injury

Flowering canola plant. Princeton, KY. 21 Mar 2016.
Carrie Knott, Extension Agronomist-Princeton, University of Kentucky

Quite a bit of information for winter canola freeze injury exists (see the end of the blog for links).

This past weekend, most of the state remained in the low-30s°F. Weather data can be found at: or  At these temperatures significant damage, even to flowering canola is not expected.  The critical temperature for winter canola is mid- to low- 20s°F. 

Friday, March 18, 2016

Potential for Winter Wheat Freeze Injury

Wheat Head Freeze Damage, 2015. 
A freeze event (24°F or less for more than 2 hours)
occurred at Feekes 6 (jointing).
Carrie Knott, Extension Agronomist-Princeton, University of Kentucky

Much of Kentucky’s winter wheat crop is still tillering (Feekes 4-5; Figure 1) or just beginning to joint (Feekes 6; Figures 2 and 3). The weather forecast for this weekend is predicting that some areas of Kentucky will dip to 32°F or less. Given that most of our wheat is at Feekes 4 or 5, with some at Feekes 6, these temperatures are not cause for concern.  

Temperatures must be 12°F or less for 2 or more hours to injure wheat that is at the Feekes 4 or 5 growth stages, which much of our state is now.  For the more advanced wheat that is jointing, Feekes 6, temperatures must fall to 24°F or less for 2 or more hours.  Although the weather forecasts do not project conditions that we would expect wheat injury, examine weather data and scout your fields to determine is freeze injury occurred. 

Freeze injury can occur in small areas of fields, which are associated to low areas of fields where cold air settles.  Be sure and check for wheat stems damage close to the soil surface; characteristic symptoms of freeze damage are listed in Table 1.  It typically takes about 10 days of warm temperatures before injury can be seen.  Weather data can be accessed by clicking on the link of your county at or

Figure 1. Wheat field at Feekes 4 growth stage 

Figure 2. Wheat at Feekes 6 growth stage.
"Joints" are indicated with orange arrows.
Figure 3. Wheat at late Feekes 5/early Feekes 6 growth stage.
The "joint" (growing point; around the 1-3/8" mark) is right at
or slightly above the soil surface.  This 'joint' is visible
after the top few leaf sheaths were removed.   

Tuesday, February 9, 2016

Agronomic Considerations to Maximize 2016 Wheat Profitability

Carrie Knott, Extension Agronomist-Princeton, University of Kentucky

Despite the blanket of snow many of us woke up to this morning it is the time of year to be considering nitrogen applications and other input decisions for this year’s wheat crop.

Tuesday, January 12, 2016

Register for UK Small Grain Disease Workshop – February 5, 2016

Carl A. Bradley, University of Kentucky Extension Plant Pathologist

Fusarium head blight (head scab)
A small grain disease workshop will be held at the University of Kentucky Research & Education Center in Princeton, KY (1205 Hopkinsville Street) on February 5, 2016. This is an all-day event with pre-meeting coffee and snacks beginning at 8:00 AM and presentations beginning at 8:30 AM. The meeting includes a lunch sponsored by the Kentucky Small Grain Growers Association and will adjourn at 4:00 PM. In addition to speakers from the University of Kentucky, the meeting will also feature speakers from Kansas State University, Purdue University, and Ontario, Canada.

There is no charge for this meeting, but PRE-REGISTRATION IS REQUIRED. The meeting is limited to the first 150 people that register.