For two years, Louisiana rice farmers have been able to apply Sercadis, BASF’s new carboxamide fungicide, to control strobilurin-resistant sheath blight under a Section 18 emergency exemption.
Beginning in 2014, Sercadis will have a full Section 3 registration for use on difficult-to-control sheath blight in Louisiana and other Rice Belt states, according to Alvin Rhodes, BASF technical service representative from Madison, Miss.
“We anticipate having that registration early in the new year (2014),” said Rhodes, who was interviewed following a presentation at the New Products from Industry session at the USA Rice Outlook Conference in St. Louis. Rhodes talked about expected registrations for Sharpen herbicide and Sercadis fungicide at the session.
“Over the last few years, resistance has developed where they cannot use any other compound, but Sercadis has done an excellent job of controlling this sheath blight,” he said. “Sercadis can control not only the resistant but also the non-resistant. In 2014, it should be labeled in all rice-growing states for control of rhizoctonia solani or sheath blight.”
Sheath blight is a disease that seems to occur annually in southern rice fields or as aerial web blight in soybeans.
“Sercadis should be applied early, more as a preventative treatment, at the rate of 6 to 6.8 fluid ounces per acre and applied by air at seven to 10 gallons of water per acre for control of sheath blight,” said Rhodes.
BASF has been offering Xemium, which is the active ingredient in Sercadis. “Xemium is part of a compound known as Priaxor, which is a pre-mix of Xemium plus Headline, and it does an excellent job of providing broad spectrum disease control and for plant health benefits on soybeans and corn”, he said.
When strobilurin-resistant sheath blight began to appear in southern Louisiana, LSU AgCenter specialists referred to outbreak as “the most economically significant in Louisiana rice production since the early 1970s.”
Sheath blight typically infects the culms at the water line between the late tillering and joint elongation growth stages, and can progress rapidly, causing tiller lodging and collapse. Sheath blight can spread from tiller to tiller within a rice field. Farmers commonly rotate rice with soybeans, which can also carry the disease.
For more information, go to http://deltafarmpress.com/rice/resistant-sheath-blight-changing-practices-louisiana