Oklahoma Farm Report masthead graphic with wheat on the left and cattle on the right.
Howdy Neighbors!
Ron Hays, Director of Farm and Ranch Programming, Radio Oklahoma Ag Network  |  2401 Exchange Ave, Suite F, Oklahoma City, Ok 73108  |  (405) 601-9211

advertisements
   
   
   
   
   

Agricultural News


Latest Oklahoma Wheat Disease Update Shows Signs of Sooty Mold and Black Point

Wed, 09 Jun 2021 14:57:19 CDT

Latest Oklahoma Wheat Disease Update Shows Signs of Sooty Mold and Black Point During the last two days there have been a couple reports of dark wheat heads being observed in fields. This is a condition call sooty mold (aka black head mold) (Figure 1). These dark heads are the result of saprophytic (living of dead tissue) or weakly pathogenic fungi growing on the dead tissue in wheat heads. Reports of this have come from Greg Highfill (Alfalfa County Extension Educator in north central OK) and from Brad Secraw (Cleveland County Extension Educator in central OK). Additionally, I have observed severe sooty mold in some of the trials around Stillwater.

      Sooty mold occurs when wheat has turned but cannot be harvested in a timely manner. Wet/humid conditions during a delayed harvest will then promote the fungal growth on wheat heads. Often wheat that has been subjected to a stress such as freeze, root rot, or drought shows a greater severity of sooty mold than if the wheat had been healthy and not stressed. This is the case in the top photo in Figure 1. The darker strips of wheat with sooty mold are the variety Pete, which was hit hard by the late freeze in April. The lighter, more golden colored heads with much less sooty mold are lines in one of Dr. Carverís nurseries. These breeder lines were not nearly as affected by the freeze as was the Pete. Although grain yield from wheat with sooty mold often is reduced, the sooty mold itself is not the primary cause of that reduce yield. Rather, it was the stress such as a freeze or root rot that was the primary cause of the reduced yield.

Figure 1. A field view of sooty mold (black head mold) on wheat at Stillwater, OK on June 9, 2021 (top photo). Note the darker appearance of the wheat heads in the alternating long, solid strips of wheat compared to lighter, more golden colored heads in the middle strip.


      One additional point to be made is that grain harvested from wheat with severe sooty mold may show a condition known as black point (Figure 2). Black point is a discoloration of the seed (typically the germ end of the seed) resulting either from infection by various fungi that typically are saprophytic but can occasionally parasitize living tissue, or from a combination of abiotic (environmental) conditions that promote the discoloration without the presence of an organism. Like sooty mold, black point often is observed when freeze damage has occurred or when harvest was delayed and dead tissue in the heads was heavily colonized by fungi that resulted in sooty mold. Black point in wheat grain can be a grading factor as the discoloration can result in black flecks in flour milled from such grain. Additionally, if used as seed wheat, kernels with black point can have reduce germination resulting in lower seedling emergence. Hence, if wheat showing black point is to be used as seed wheat, it is imperative to check the germination of that seed and to use a seed treatment that controls seed and seedling rots.


Figure 2. Wheat kernels with black point. The wheat kernels to the left and right show typical black point. The kernel in the middle is healthy. Ignore the reddish-pink color in the outer kernels as this is from an applied seed treatment.


   

Latest Oklahoma Wheat Disease Update Shows Signs of Sooty Mold and Black Point
   

 

WebReadyTM Powered by WireReady® NSI

 


Top Agricultural News

  • Dairy Defined Podcast: The Numbers Show It -- U.S. Dairy is Growing Globally  Mon, 21 Jun 2021 09:56:38 CDT
  • USDA Reminds Oklahoma Producers to File Crop Acreage Reports  Mon, 21 Jun 2021 09:21:25 CDT
  • Sussman Donates Turner Farm to American Farmland Trust  Mon, 21 Jun 2021 08:30:16 CDT
  • Tick Talk: Time For Parasite Prevention, OSU Experts Say  Mon, 21 Jun 2021 08:27:03 CDT
  • OSU's Derrell Peel Believes Feedlots Are Only a Few Weeks Away From Being Current on Fed Cattle Supplies  Mon, 21 Jun 2021 07:27:32 CDT
  • Monday Preopening Market Update with Dave Lanning  Mon, 21 Jun 2021 07:07:37 CDT
  • AFR Pushes for Later Dicamba Application Deadline  Fri, 18 Jun 2021 17:38:53 CDT
  • Friday, June 18, 2021 Market Wrap-Up with Justin Lewis  Fri, 18 Jun 2021 14:52:10 CDT

  • More Headlines...

       

    Ron salutes our daily email sponsors!

    Oklahoma Ag Credit Oklahoma Farm Bureau National Livestock Credit Ag Mediation Program P&K Equipment Oklahoma City Farm Show Union Mutual Stillwater Milling Oklahoma Cattlemen's Association KIS FUTURES, INC.

    Our Road to Rural Prosperity sponsors!

    Banc First OPSRC ORWA TPAOO TPAOO

    Search OklahomaFarmReport.com


       
       
    © 2008-2021 Oklahoma Farm Report
    Email Ron   |   Newsletter Signup   |    Current Spots   |    Program Links

    WebReady powered by WireReady® Inc.