man unloads lake weed harvester weeds

agriculture algae aquatic blooms canary choke clogging contaminate curlyleaf cut cutter cyanobacterial decompose dredge dredger environment eurasian fertilizer flea floating grass grate growth habitat harmful harvester herbicide humans hydrilla improve invasive knives lake life loosestrife management marine microbes mussells native nature nitrogen nutrients overgrown overgrowth pesticides phosphorus phytoplankton pickup pond protect public purple quality recreation reed resources restoration river runoff sediment shoreline skimmer soil species spiny splash splashes trailer trees truck vegetation water watermilfoil waters watershed weeds wheel wildlife zebra