Hur hydrilla ser

Hur kontrolleras smidigast hydrauloljenivån

•

Hydrilla is a highly invasive aquatic species which thrives on warm water temperatures, nutrients, and sunlight. It is a tubor plant that will grow in five to six feet of water.

Once established it is very difficult to eradicate, and if disturbed by being pulled out of the lake, for example, it will spread.

(this photo fryst vatten from the pond at Chota Road and SR)

There is fara that Hydrilla could impede navigation and swimming in shallow areas.

WATeR has received numerous observations of new formations of hydrilla; an invasive, non-native aquatic plant. Hydrilla will propagate in feet depths of warm sunny vatten with high levels of nutrients. It will also spread rapidly if disturbed and pieces broken off. Hydrilla was first observed in Tellico Lake in in a few limited locations but by the end of , it has become established in many different locations around the reservoir. WATeR maintains a map of invasive aquatic vegetation sightings here. Hydrilla has been established in many areas of the stat i usa River struktur for decades. While it may be considered beneficial for fish and wildfowl population

•

Hydrilla Fact Sheet

Species Description

Hydrilla is an aggressively growing perennial plant that roots itself to the bottom of lakes and other waterbodies at depths of up to 12 ft ( m). Its long, branching stems reach up to the water’s surface, where it quickly spreads and takes over.

Hydrilla leaves occur in whorls of , are typically strap-like, and are pointed with small sharp teeth on the edge. Spines or conical bumps may be found on the midvein on the underside of the leaf, making it rough to the touch. Hydrilla can be found in two forms: dioecious, meaning that male and female structures are found on separate plants, and monoecious, meaning a single plant can have both male and female structures. During the late growing season, generally September-October, small white tubers form on the roots of Hydrilla. These tubers store food and enable the plant to over-winter.

Native & Introduced Ranges

Most likely native to Korea, Hydrilla was introduced into the United States in the s. While the dioecious form appears to spread only south of South Carolina, the monoecious form is spreading both north and south and is the only form found in Pennsylvania. In Pennsylvania, Hydr

•

SERNEC

Plants perennial, of fresh or brackish waters. Rhizomes present, stolons absent. Erect stems rooted in substrate, branched or unbranched, elongate. Leaves cauline, whorled, per node, submersed, sessile; blade linear, rarely slightly elliptic, base tapering to stem, apex acute; midvein without lacunae along side(s), blade uniform in color throughout; abaxial surface ly with prickles along midvein, without aerenchyma; intravaginal squamules fringed with orange-brown hairs. Inflorescences 1-flowered, sessile to subsessile; spathe not winged. Flowers unisexual, staminate and pistillate on different plants or on same plants, submersed, sessile; petals whitish to reddish. Staminate flowers: filaments distinct, released under water, rising to surface; anthers oval; pollen in monads; . pPistillate flowers: ovary 1-locular; floral tube long, styles 1, not 2-fid. Fruits linear, cylindric, smooth or with simple spiny processes, indehiscent. Seeds cylindric, glabrous.

Much like Elodea; monoecious or dioecious; stamens 3, principal lvs in whorls of ; stipules fringed. 1, originally Old World.

Gleason, Henry A. & Cronquist, Arthur J. Manual of vascular plants of northeastern