If you want to use an herbicide to treat a large pond, check the Links below for information on which herbicides are effective and how to apply them safely. There are also links to sites detailing biological controls such as the Triploid Grass Carp and the Milfoil Weevil. Water Spinach Convovulaceae Ipomoea aquatica Federally Prohibited Giant Salvinia Salviniaceae Molesta spp. Giant Duckweed Spirodela oligorhiza Giant Duckweed is also called duck-meat, large duckweed, or common duckmeat. Leaves have 5-11 prominent nerves, and are green above and reddish below.
Giant duckweed is one of the largest of several types of duckweed.
It floats on small ponds and quiet backwaters of bayous and streams. In small ponds giant duckweed may produce dense growths that may block light need by more desirable aquatic plants. It may produce growths thick enough to block access by wildlife and livestock. Salvinia, also called Water Fern, is a small, aquatic fern that floats at the surface with a hairy root-like leaf dangling below. Floating leaves are in pairs, oblong to nearly round, about 0.4 to 0.8 inches in length.