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Illinois Pondweed provides forage and cover for aquatic
animals; the tuber is an important source of food for waterfowl.
The Illinois pondweed is found in lakes, ponds and rivers.
Dense populations of plants reduce the water temperature
and oxygen concentrations when plants die in late summer.
Illinois Pondweed may form dense mats and block sunlight for
other submersed vegetation species along with interfering with
fishing, boating and swimming.
Cutters, Nets & Rakes
Illinois Pondweed has stout
stems that emerge from a thick rhizome. Most of the submerged
leaves are lanced shaped to oval and either attached directly to
the stem or have a short stalk. The leaves have 9-19 veins and
often have a sharp needle like tip. The stipules are free in the
axils of the leaves and have two prominent ridges called
Illinois pondweed is similar to American
pondweed, and can be easily confused. Illinois Pondweed
(potamogeton illinoensis) has slightly heart shaped leaves
particularly at the base on a long stem. The petiole is shorter
than that of the floating-leaf pondweed.
A. Spot treat as
needed to maintain navigation channels and swimming areas. Remember
this plant is very beneficial and should not be treated where it is
not a nuisance.
A. Once water
temperatures are around sixty degrees or warmer however this plant
responds equally well to herbicide treatment when mature.
A. One treatment
per season is usually enough.
within two to three weeks things will be cleared up.
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