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ALERT: Soybean rust found in five north Texas counties near Dallas
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By Marilyn Cummins, Editor
StopSoybeanrust.com
7/20/2007 10:15 a.m. CDT -- Asian soybean rust was found in low levels in commercial soybean fields in five Dallas-area counties in northern Texas. This adds to recent finds in commercial fields in Austin, Fort Bend and Jackson counties reported yesterday.
The new infected counties are Collin, Dallas, Ellis, Fannin and Hunt. This brings the total of Texas counties with soybean rust this year to 15, the highest count in the U.S. this year. Soybean rust has appeared in 42 counties and parishes in 2007, compared to only 25 in the U.S. and only one in Texas at this point last year.
According to today's Texas state commentary, soybean rust is widespread in the Upper Coast part of the state around Jackson, Fort Bend, Austin and Victoria counties. This area is still receiving isolate, heavy thundershowers.
Commercial soybean crops in southernmost Texas and the Upper Gulf Coast (between Victoria and Houston) are flowering to full seed, officials said. "Many fields are no longer vulnerable to yield loss to rust, but some still are."
Fields in the Upper Coast Counties, including Calhoun, Victoria, Jackson, Wharton, Colorado, and Fort Bend are at high risk for rust development, the commentary said Wednesday, and "a preventative fungicide application is advised if these fields are not at R6. Fields in central and east Texas that are R1 to R5 are at risk, and a preventative fungicide application is recommended."
Louisiana rust spreading in infected counties
Late yesterday afternoon, the Louisiana state commentary reported that:
"Today, Dr. David Lanclos and his very able crew of Matt Martin, Rob Ferguson and Lucas Pitre found additional commercial fields with ASR in Rapides and Avoyelles Parishes. Their survey included nine fields in Rapides, seven of which were positive for ASR with incidence levels ranging from 1% to 30% and severity levels ranging from 5 to 40%.
"In Avoyelles, seven fields were surveyed with three being positive, with incidence and severity levels being 5%. One field was surveyed in St. Landry Parish, but no rust was detected.
"Since these new detections were in parishes where ASR had been reported earlier this year, no new parishes will be "turned red" on the USDA-APHIS website," they said.
Continued scattered showers have occurred, making conditions favorable for ASR development," the commentary said. "Scouting continues across the state. The soybean sentinel plot growth stages range from R3 to R6. Applications of fungicides continue statewide especially in the southern parishes. The targets include the traditional diseases plus ASR."
Source: State commentaries on www.sbrusa.net.
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