Crowley, Louisiana, USA
August 27, 2014
Jong Ham, LSU AgCenter plant pathologist, far left, talks about his work on the disease bacterial panicle blight. He said a number of different control measures are being studied to fight the disease on rice, but he said early planting and early harvest are methods of controlling the disease. Photo by Bruce Schultz
LSU AgCenter scientists held a field tour at the Rice Research Station here on Aug. 26 to discuss their work on controlling the major diseases that afflict rice.
Clayton Hollier, AgCenter plant pathologist, said even varieties with the best resistance can be affected by disease.
“Resistance is not immunity,” Hollier said.
But, he said, resistance is likely to result in higher yields than varieties that are susceptible to diseases.
Hollier said he is studying how different fungicide application times and planting dates could affect yields.
He said Cercospora is an overlooked disease that damaged many crops in 2006. The disease known as narrow brown leaf spot is caused by Cercospora, he said, which overwinters in crop residue.
Don Groth, LSU AgCenter plant pathologist, at right, talks with crop consultant Doug Leonards about disease research being conducted at the Rice Research Station. Groth has research plots at the station that show effectiveness of different fungicides on the most popular rice varieties grown in the Midsouth. Photo by Bruce Schultz
Jong Ham, AgCenter plant pathologist, is studying ways of controlling bacterial panicle blight. He said biological controls that suppress development of the disease have been identified that will be studied.
Ham said rice breeding includes development of resistant lines. He said the most resistant variety is the medium-grain Jupiter, developed at the Rice Research Station.
But, he said, even a variety with bacterial panicle blight resistance will lose 10-15 percent of its yield if it is infected by the disease.
“It is a challenge to get resistance to all diseases,” he said.
Planting and harvesting early are keys to reducing the bacterial panicle blight problem, he said.
Don Groth, AgCenter plant pathologist, discussed how the major varieties grown in the U.S. are affected by disease and how they respond to fungicide applications. He said he inoculates research plots with bacterial panicle blight and sheath blight, but not for blast because it is spread by wind, and he doesn’t want to risk infecting nearby fields.
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