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


Watch for Sorghum Midge in Late-Blooming Sorghum

Thu, 14 Aug 2014 10:28:19 CDT

Watch for Sorghum Midge in Late-Blooming Sorghum
Pest Alert by Tom A. Royer, Oklahoma State University Extension Entomologist


I noted high populations of sorghum midge adults actively swarming on some late blooming heads in my sorghum plots at the Cimarron Research and Extension Center in Perkins. Favorable climate and abundant Johnson grass may allow them to become a problem in late-planted sorghum this year.


Sorghum midge is a tiny fly, measuring less than 1/32 inches long. It has a reddish abdomen with one pair of grayish transparent wings. The female fly lays eggs in open florets and the maggots feed inside the developing seed. The contents of the seed are usually completely consumed. The lifecycle from egg to adult is completed in 14-16 days. Heads that have sorghum midge injury are referred as “blasted”. The adults live for one day, but one female can lay 30-100 eggs.


Insecticide control: Scouting is essential to achieve effective control with an insecticide. Use a 10X magnifying hand lens to aid in identification. There are two ways to scout. One is to carefully move to a plant without disturbing it, quickly put a plastic bag over the head, and shake it vigorously. Remove the bag and contents and look for midges inside the plastic baggie. The other way is through direct observation; without disturbing the plant, look for small gnat-sized flies that are moving about the head or are laying eggs on flowers with extended anthers.


The sorghum midge is most active from 9:00 -11:00 am, so that is the best time to scout. Begin scouting when the heads first emerge and begin pollinating. Continue every 3 days until the field is finished blooming. The economic threshold is 1 midge per head for susceptible or 5 midge per head for resistant varieties. There are numerous insecticides labeled for control. Apply the first when the threshold is reached, and 25-30% of the heads are blooming. A second application may be necessary in 3-5 days. All label restrictions should be followed. Click here for a list of registered insecticides, consult CR-7170, Management of Insect and Mite Pests in Sorghum.


If a producer asks what can be done to avoid the problem next year, I suggest the following management strategies which are listed from most to least desirable:


-- Planting Date: This should be strongly encouraged! Plantings of sorghum should occur early and uniformly in an area. By planting early, the crop will avoid an infestation. If all plantings flower at the same time, existing midge populations become diluted. As the season progresses, midge numbers build on Johnson grass and sorghum, and will concentrate on later plantings. In general, the risk of a sorghum midge infestation increases for each day past August 15 that the sorghum blooms.


-- Control Johnsongrass in and around sorghum fields. Controlling Johnsongrass before the sorghum blooms can reduce resident midge populations.


-- Resistant varieties: There are a limited number of resistant varieties of sorghum available from seed companies. Resistant lines generally suffer only 1/5 the injury that susceptible lines receive from the same number of adults. Consider a resistant variety for double crop sorghum that will bloom after the 15 of August.

   

 

WebReadyTM Powered by WireReady® NSI

 


Top Agricultural News

  • District Court Affirms State Beef Councils Are a Legal Part of the Beef Checkoff- Dismisses Litigation Brought by R-Calf USA  Fri, 27 Mar 2020 22:44:36 CDT
  • Friday, March 27, 2020 Market Wrap-Up with Justin Lewis  Fri, 27 Mar 2020 15:18:59 CDT
  • Oklahoma Grain Elevator Cash Bids as of 2:00 p.m. Friday, March 27, 2020  Fri, 27 Mar 2020 15:15:49 CDT
  • Agriculture Retailers Association Commends Congress on CARES Act Passage  Fri, 27 Mar 2020 13:57:47 CDT
  • Lucas Applauds House Passage of Support For America’s Families, Workers, and Businesses  Fri, 27 Mar 2020 13:54:47 CDT
  • State Department Clears the Way for Agriculture Workforce   Fri, 27 Mar 2020 11:18:24 CDT
  • USDA Rural Development Launches COVID-19 Resource Webpage  Fri, 27 Mar 2020 11:16:46 CDT
  • Farm Bureau Continues Tradition of Giving Back to Hungry Americans  Fri, 27 Mar 2020 11:12:25 CDT

  • More Headlines...

       

    Ron salutes our daily email sponsors!

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

    Our Road to Rural Prosperity sponsors!

    Banc First OPSRC ORWA TPAOO TPAOO

    Search OklahomaFarmReport.com


       
       
    © 2008-2020 Oklahoma Farm Report
    Email Ron   |   Newsletter Signup   |    Current Spots   |    Program Links

    WebReady powered by WireReady® Inc.