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VI. AQUATIC PLANTS : Yes No BMPs <br /> Structures. <br /> 85 ) . Are ditches maintained to prevent aquatic plants from clogging ❑ ❑ E1 .3 <br /> discharge structures ? <br /> 86) . Are measures taken to prevent floating vegetation from clogging ❑ ❑ E1 <br /> culvert riser structures? <br /> 87) . Are physical deterrents such as ribbon barriers, traps, or baffle boxes ❑ ❑ £ l <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? ❑ ❑ E2 <br /> Strategies. <br /> 89) . Are mechanical harvesters used to remove aquatic weeds from ❑ ❑ E1 <br /> ditches or canals ? <br /> 90) . Are biological control agents such as flea beetles, hyacinth weevils, ❑ ❑ 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 ❑ ❑ E3 <br /> chemical on the weed to be eliminated whether it is submersed, <br /> emergent or floating? <br /> 9 <br />