Torpedograss (Panicum repens L.)

Problem Torpedograss (Panicum repens L.) is a nonnative riparian, wetland and terrestrial plant native to Eurasia and is considered one of the World’s worst weeds. It is also known as quack grass and bullet grass. When fully matured, torpedograss can grow up to 3 feet tall and form dense monotypic stands that out compete native species and lead to a loss of diversity and overall ecological health (Figure 1). The annual cost of torpedograss management in flood control systems has been estimated at 2 million dollars. It is considered a threat to wetlands and riparian zone areas because it outcompetes desirable native plants. Torpedograss now occupies thousands of acres of native marsh in Florida and occurs in 75% of Florida’s 67 counties. Torpedograss is also a problem weed in turf and other areas in home landscapes and has been considered for listing as a noxious weed in Mississippi. It can also be a problem in citrus and many other crops. It does not provide adequate forage or habitat quality as compared to the native plants it displaces. Regulation Although torpedograss has been considered for regulation, it is not regulated in MS. However, torpedograss is a Class C Noxious Weed in Alabama and a Noxious Plant in Texas. It is a Prohibited Noxious Weed in Arizona and a Noxious Weed in Hawaii.