Gypsy Moth June 2008 Didymo May 2008 Chestnut Blight April 2008 Whirling Disease March 2008 Water Lettuce January 2008 Laurel Wilt December 2007 Rusty Crayfish November 2007 Miscanthus October 2007 Tree of Heaven September 2007 Wavyleaf basketgrass August 2007 Chinese Mitten crab July 2007 Japanese Hops June 2007 Princess Tree (Paulownia tomentosa) May 2007 Callery pears April 2007 MSX, (Haplosporidium nelsoni) March 2007 Varroa Mite February 2007 Emerald Ash Borer January 2007 Japanese Barberry December 2006 Wineberry September 2006 Purple Loosestrife July 2006 Multiflora Rose May 2006 Viburnum Leaf Beetle April 2006 House Sparrow March 2006 Green Crab February 2006 Sirex noctilio January 2006 Japanese Honeysuckle November 2005 Resident Canada Geese October 2005 Phragmites July 2005 Brown Marmorated Stink Bug June, 2005 Mute Swan May, 2005 Canada Thistle April, 2005 Bush Honeysuckle March, 2005 Lesser Celandine February, 2005 Nutria January, 2005 Chrysanthemum White rust November, 2004 Mile a Minute October, 2004 Giant African Snails September, 2004 Sudden Oak Death August, 2004 Porcelainberry July, 2004 Water Chestnut June, 2004 Plum Pox May, 2004 Zebra Mussel April, 2004 Emerald Ash Borer March, 2004 English Ivy February, 2004 Pine Shoot Beetle January, 2004 Oriental Bittersweet December, 2003 Pryeria sinica November, 2003 Asian Lady Beetle October, 2003 Japanese Stiltgrass September, 2003 Red Imported Fire Ant August, 2003 Mute Swan June, 2003 Garlic Mustard May, 2003 Giant Hogweed April, 2003 Hemlock Woolly Adelgid March, 2003 Maryland Invasive Species Brochure February, 2003

Daylilies and the "Great Wall of Kudzu", photo: S. Tangren