Hydrilla Control

Optimum results may be achieved by applying our Dock and Swim Area Products. Another option would be Hydrothol Granular. Apply evenly early in the day under calm, sunny conditions at 60F or higher in accordance with label instructions.

Our lake rakes, including our mechanical LAKEMAID®, are a excellent mechanical alternative to keep Hydrilla plants from ever starting to grow.

If you have any questions or would like to speak to us about hydrilla control, please feel free to call us at: 1-877-428-8898

Hydrilla is very prolific. It can reproduce four ways: Fragmentation, Tubers, Turions, and Seeds (primary reproduction of Hydrilla is vegetatively with seeds being a minor means of reproduction).

Fragmentation is a very efficient means of reproduction that can occur from regrowth of a stem fragment with a single whorl of leaves (up to 50% of the time). Fragmentation is the main reproduction mechanism for Hydrilla.

Hydrilla can also reproduce by potato-like tubers 1/2" long by 1/2" broad attached to the creeping root-like stem or rhizome found 30 cm deep in the mud. Hydrilla tubers can remain viable several days out of the water or for over four years in undisturbed sediment.

Dark green, cylindrical, auxiliary buds called turions (or winter buds) measuring about 1/4" at leaf axils are yet another way Hydrilla reproduces. There is evidence they can survive ingestion and regurgitation by waterfowl and herbicide applications.

Hydrilla can grow an inch per day to densities over 130 tons per acre. Dense growths of Hydrilla stunt bass, panfish and other sportfish. Large masses of Hydrilla reduce flow in drainage canals resulting in flooding, erosion and restricted navigation. Swimming, recreation and property values can be negatively impacted. Hydrilla can tolerate lower temperatures and lower levels of sunlight than some native species. This can allow Hydrilla to establish itself sooner, out-competing and displacing native aquatic plants.

Identifying Hydrilla

Hydrilla is a submerged plant from the genus Hydrilla. Hydrilla stems are up to 25 feet long and branched with oppositely arranged leaves at the bottom. Upper portions of the Hydrilla plant can have 2 to 8 whorls of leaves around the stem.

The small leaves are oval shaped with serrations at the margins and pointed spines on a reddish midrib underside. Hydrilla can be rough to the touch with profuse branching near the surface. Hydrilla has a creeping root-like underground stem or rhizome that is off-white to yellowish.

Hydrilla tissue is 90% water with both male and female flowers on a single plant. The dense foliage of Hydrilla can form mats that intercept sunlight, thereby displacing native aquatic plants. Hydrilla is an agressive and competitive colonizer.

In the United States, Hydrilla is found primarily in the springs, ditches, marshes and lakes of southern states up to 40 degrees North latitude. This invasive, non-native is rapidly moving north from present infestations in California, Arizona, Gulf Coast; and from Southeast states north to Washington D.C.

A wide variety of environmental conditions within flowing, stagnant, fresh, tidal, subtropical and temperate areas contain habitat suitable for Hydrilla. North and South America, New Zealand, Pacific Islands, Asia, Europe, Africa and Australia have Hydrilla.

Hydrilla can grow in oligotrophic (low nutrient) to eutrophic (high nutrient) chemical conditions. Hydrilla has a high resistance to salinity in tidal wave areas, up to 7% the salinity of sea water. Hydrilla can tolerate a wide pH range, but does best in pH 7. Hydrilla is found in light conditions as low as 1% of sunlight and depths of only a few inches to 50 feet.

For easy hydrilla control, we recommend using our Dock and Swim Area Products.