Aquatic Weed Control

The CCMCD has a limited Aquatic Weed Control Program to help control mosquito breeding. We do not control aquatic weeds for beautification purposes. We control plants that harbor mosquito breeding, or to thin out areas such as floating plant mats where growth is so thick that natural predators (e.g. gambusia fish) can't find the mosqutio larvae and pupae.

Spraying Hyacinth
Spraying Hyacinth


Floating plants; Water Hyacinth and Water Lettuce, are our primary focus. These plants support the development of the pest mosquitoes Mansonia dyari and Mansonia tittlians. A thrid pest mosquito, Coquilletidia perturbans, is found on a number of types of rooted plants along the edges of lakes, ponds, canals, and ditches.

The larvae and pupae of these three species attach their modified air tube to the root hairs of these plants to extract oxygen. They do not go to the water's surface for oxygen like other mosquito species. This makes it difficult for site inspectors to detect breeding and use surface type treatments, such as oils and mono-molecular films, which are ineffective against these species.


Water Hyacinth (Eichornia crassipes) -
This free-floating plant from Brazil reaches up to 3 feet in height. Leaves are thick, leathery, and elliptic to ovate in shape and emerge from the plant base. The leaf stem is inflated and spongy to provide floatation. The flowering spike contains 5 - 20 very showy light purple flowers with a yellow spot. Roots are dark, fibrous and feathery in appearance.
Water Hyacinth

Water Lettuce
Water Lettuce (Pistia stratiotes) -
This plant is normally more succeptable to cold weather than Hyacinth. Water lettuce is a free-floating plant with many spongy, dusty green simple leaves. The leaves are covered in very fine hairs and arranged in a spiral pattern from the center of the plant. Water Lettuce is a very aggressive invader and can form thick floating mats.

Cattails (Typha spp.) -
Rooted and floating cattails, especially when floating in a mat, are the principal host plants for Coquilletidia perturbans

CCMCD Aquatics will place these signs when applying herbicides and in addition will hand out flyers to neighboring homes. CCMCD will remove these signs when it's safe again for swimming, drinking or irrigation of lawns. Usually after 5 days from application date.
Spray Sign


Equipment and Specifications
(click on a picture to view the specs)

Batch Truck




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