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VI. AQUATIC PLANTS : <br /> Yes No BI17Ps <br /> Structures. <br /> 85 ) . -Are ditches maintained to prevent aquatic plants from clogging <br /> discharge structures ? <br /> 86) . Are measures taken to prevent floating vegetation from cloggingE ] <br /> culvert riser structures ? <br /> 87) . Are physical deterrents such as ribbon barriers , traps, or baffle boxes El <br /> used to limit the movement of aquatic weeds and debris from canals <br /> and ditches to off- site waterways ? <br /> 88 ) . Are fish barriers used to contain grass carp within targeted ditches ? ❑ Li E2 <br /> Strategies: <br /> 89) . are mechanical harvesters used to remove aquatic weeds from <br /> ditches or canals ? E 1 <br /> 90) . Are biological control agents such as flea beetles, hyacinth weevils, 11 E2 <br /> or grass carp used to manage aquatic weeds ? <br /> 91 ) . When selecting aquatic herbicides for target species is mode of ❑ ] E3 <br /> action, residual toxicity, and potential for offsite movement considered ? <br /> 92) . Are appropriate measures taken to control drift and place the desired .71 u E3 <br /> chemical on the weed to be eliminated whether it is submersed , <br /> emergent or floating ? <br /> q <br />