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VI. AQUATIC PLANTS : Yes No B117Ps <br /> Structures: <br /> 85 ) . Are ditches maintained to prevent aquatic plants from clogging 0 EI -3 <br /> discharge structures ? <br /> 86 ) . Are measures taken to prevent floating vegetation from clogging 0 El <br /> culvert riser structures ? <br /> 87) . Are physical deterrents such as ribbon barriers, traps, or baffle boxes 0 0 El <br /> used to limit the movement of aquatic weeds and debris from canals <br /> and ditches to off- site waterways ? <br /> 8.8 ) . Are fish barriers used to contain grass carp within targeted ditches ? 0 0 E2 <br /> Strategies: <br /> 89) . Are mechanical harvesters used to remove aquatic weeds from 0 0 E1 <br /> ditches or canals ? <br /> 90) . Are biological control agents such as flea beetles, hyacinth weevils, 0 0 E2 <br /> or grass carp used to manage aquatic weeds ? <br /> 91 ) . When selecting aquatic herbicides for target species is mode of 0 0 E3 <br /> action, residual toxicity, and potential for offsite movement considered ? <br /> 92) . Are appropriate measures taken to control drift and place the desired 0 u E3 <br /> chemical on the weed to be eliminated whether it is submersed, <br /> emergent or floating ? <br /> 9 <br />