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  • Spatial and Temporal Variability of the Alligatorweed Pathogen, Alternaria alternantherae, in Louisiana

    Abstract: Alligatorweed leaf spot is a disease of invasive Alternanthera philoxeroides(Alligatorweed) in the southern US, caused by Alternaria alternantherae. However, little is known about when or where this pathogen naturally occurs. To better understand this species’life history, we examined temporal (every 2–3 weeks) and spatial (latitudinal) patterns of A. alternantherae occurrence at sites in Louisiana for 2 y. Pathogen presence reflectedclear within-year temporal and spatial patterns. Overall, the percentage of leaves infectedwith A. alternantherae was low during spring each year (0–20% infected) but increasedthroughout summer (maximum of 50% infected), and plants in northern sites had lowerfrequency of infection relative to southern sites until later in the year (late summer/early fall) but only in 1 of the 2 years of our study. The mean proportion of leaves infected with A. alternantherae declined with latitude both years (P = 0.01) and variability increasedwith latitude (P = 0.04), a pattern suggestive of range limitation in northern areas. We estimate a northern distributional limit of 34°N for A. alternantherae in Louisiana, but Alligatorweed occurs farther north. Although we did not directly examine disease impacts to Alligatorweed during the study, they may be greatest in southern areas, where the pathogenis more common early and throughout the growing season, and thus may be less likely to provide control in northern infestations of the invasive Alligatorweed.
  • USACE Vicksburg District temporarily closes road and area around Wallace Lake Dam

    VICKSBURG, Miss. – The U.S. Army Corps of Engineers (USACE) Vicksburg District will close road and foot traffic access to Wallace Dam starting today.
  • U.S. Army Corps of Engineers initiates Blue Roof Program

    VICKSBURG, Miss. — The U.S. Army Corps of Engineers is reviving its free Operation Blue Roof program to get as many houses into livable condition as possible during Hurricane Ida recovery. Operation Blue Roof is a priority mission managed by the U.S. Army Corps of Engineers for FEMA.
  • My Hurricane Laura Deployment Experience

    Working with the U.S. Army Corps of Engineers has given me a lot of opportunities to learn, grow, and challenge myself. Most recently, I was deployed down to Lafayette, Louisiana, along with several other USACE teammates, and we were assigned to support the Federal Emergency Management Agency’s temporary housing mission.
  • Hurley docked after another successful dredging season

    After almost eight months of dredging the Mississippi River, the Dredge Hurley and crew are now home where the Hurley is docked at Ensley Engineer Yard for some much-needed repairs and maintenance.
  • USACE reactivates Blue Roof program for homes damaged by Hurricanes Laura/Delta

    USACE is continuing to install blue roofs on homes damaged by Hurricane Laura. However, if you had a Hurricane Laura temporary blue roof installed by the USACE in Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis and Vernon parishes, and it was damaged by Hurricane Delta, the USACE will assess its condition, and, if appropriate, replace it. ALL eligible homeowners within the six affected parishes are eligible to sign-up for a FREE temporary roof through Oct. 24, 2020.
  • USACE Vicksburg District resumes collection of recreation area fees

    VICKSBURG, Miss. – The U.S. Army Corps of Engineers (USACE) Vicksburg District will resume the collection of fees at its recreation sites’ day use areas beginning Oct. 1. Fee collections were suspended earlier this year when recreation areas were closed due to COVID-19 precautions. The USACE Vicksburg District has collected camping fees through online reservations at www.recreation.gov and will continue this system across its projects in Mississippi, Arkansas and Louisiana.
  • Corps installs 5,000th blue roof on one month anniversary of hurricane’s landfall

    The U.S. Army Corps of Engineers commemorated the one month anniversary of Hurricane Laura making landfall with the installation of the 5,000th roof as part of Operation Blue Roof in southwest Louisiana.
  • USACE provides power to hard-hit Louisiana

    Living in the 21st century, most Americans have electricity on demand. When it isn’t working, it usually doesn’t take longer than a day to get it turned back on. But what happens when a storm like Hurricane Laura hits? Close to 200,000 residents living in southwestern Louisiana lost power on Aug. 27. Many of them are still without it, weeks after the storm has come and gone. Delivering power to southwest Louisiana is one of the U.S. Army Corps of Engineers' top priorities. USACE is installing generators in several critical facilities like water pump stations, sewage lift stations, hospitals, radio towers, and corrections facilities, to name a few. The 23-person team responsible for installing these generators ensured they were in Louisiana before Hurricane Laura even made landfall.
  • First temporary ‘Blue Roof’ a success

    “The governor happened to have a news conference and my wife said, well what about the blue roofs?” Duhon said. “She gave me the information and I got online and registered and here we are today.” The purpose of the program is to provide homeowners in disaster areas with fiber-reinforced sheeting to cover damaged roofs until permanent repairs can be made. The deadline to sign up for the Blue Roof Program is Sept. 21. Don't wait!