SCOUTING, SCOUTING, AND SCOUTING

Sclerotinia Blight Advisory

Sclerotinia blight has been confirmed in a peanut field in Surry County, VA. According to the Sclerotinia advisory, the current risk for Sclerotinia in Virginia is HIGH and scouting for the disease is recommended. Cool temperatures and high humidity favor disease development. Signs and symptoms of Sclerotinia blight include rapid wilting and death of infected branches, bleaching of stems, and white, fluffy fungal growth on stems, leaves, or pegs. Once Sclerotinia is identified in a field, a fungicide spray such as Omega is the best way to limit further development of the disease. Foliar fungicide applications may be needed in fields with a 2- or 3-year peanut rotation if the crop has reached R3 (beginning pod stage). Fields with a 4-year or longer rotation do not need a foliar fungicide application until R5 (beginning seed stage).  According to the Virginia leaf spot advisory, the last effective spray dates for peanut leaf spots are the following: June 18 (Suffolk), June 20 (Southhampton - Capron), June 18 (Greensville – Skippers), June 20 (Sussex – Waverly). Fungicide applications for foliar diseases may increase severity of Sclerotinia blight.

 

 

 

 

 

 

 

 

 

 

 

 

Southern Rust on Corn in North Carolina

Southern rust, a potentially devastating disease of corn, has been reported from several counties in North Carolina. At this time, southern rust has NOT been reported in Virginia. Samples of corn plants suspected to be infected with southern rust should be submitted to your local extension office or the disease clinic at the Virginia Tech Tidewater AREC (contact Dr. Hillary Mehl, hlmehl@vt.edu). Signs of the disease are pustules filled with powdery masses of orange spores (see attached photo). Typically the disease has little impact on Virginia corn since it arrives too late in the season to affect yield, but if southern rust is confirmed in Virginia prior to corn reaching the dent stage (R5), fungicide applications may be warranted. Updates will be provided as more information is obtained.

 

For more information on fungicide recommendations, scouting techniques, thresholds recommendations contact your local extension agent Brittany A. Council at (434)-348-4233.

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