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acre foot active ingredient algaecides animals application rates aquatic plant growth aquatic vegetation aquatic weeds arrowhead average depth bladderworts bloom boat body of water bulrushes CATALOG OF AQUATIC cattails Chemical Controls Common Elodea coontail Cooperative Extension Service dense aquatic Dosage duck foods duckweed emergent plants Environmental Filamentous algae Fish Kills Floaters floating leaves floating plants FLOWERING AQUATIC PLANTS flowering plants Flowers and seeds food chains free-floating plants Granules grow habitat hard water label lake or pond lakes and ponds leaf Leaves are whorled microscopic Muskgrass nutrients organisms oxygen Pennsylvania Fish Commission photosynthesis Pickerelweed plankton algae plant fragments Plants reproduce pollination pond or lake ponds and lakes pondweed Potamogeton reproduces by rootstocks ribbon-like roots rootstocks and seeds shallow shoreline small ponds soft water spatterdock species of algae square feet stalks submerged plants surface acres swimming terminal spike treated water and reproduce water body Watercress waterlilies watermilfoils winter buds