![]() Underwater weed cutting must be done continuously during the summer and usually represents a long-term financial investment. Mechanical control is usually slower and more expensive than the use of herbicides. Many weed species can spread and reproduce from these pieces. Most mechanical control methods fragment weeds. Aquatic weed harvesters collect weeds for removal.ĭisposal of harvested weeds can be a problem. Some mowers simply cut the weeds loose beneath the water surface. Motor-driven underwater weed cutters are available and can be used for the control of such plants as water-lilies and watermilfoil. Hand-pulling weeds or dredging the pond may be used, if practical. ![]() Aquatic herbicides may not be an option if the water is used for livestock, drinking, or fish. Mechanical control may be needed to manage severe waterweed infestations. Lining canals will help to alleviate water weed problems, too. If the banks are leveled and smoothed, hard-to-reach places will be eliminated. Proper design and construction of ditches and channels makes weed control easier in the future. Banks should be sloped steeply so that very little water is less than 2 to 3 feet deep. Shallow water at the margins provides an ideal habitat for emergent plants. ![]() Proper site selection, design, and construction of ponds are important factors in preventive control of aquatic weeds. Managing Aquatic Weeds Preventative Control Lembi, Aquatic Weed Specialist, Purdue University and Aquatic Pest Control, University of California Leaflet 2961 Adapted from North Central Regional Extension Publication No. ![]()
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