Related by context. Frequent words. (Click for all words.) 70 aquatic weeds 68 aquatic vegetation 65 milfoil 65 hydrilla 64 invasive weeds 64 phragmites 64 purple loosestrife 63 invasive weed 61 knotweed 61 invasive species 61 eelgrass 61 duckweed 61 hemlock trees 60 invasives 60 Japanese knotweed 60 whitefly 59 cattail 59 Phytophthora 59 sedge 58 hemlock woolly adelgid 58 weeds 58 invasive aquatic 58 forbs 58 Didymo 58 adelgid 57 vegetation 57 buckthorn 57 knapweed 57 salt cedar 57 insect populations 57 whiteflies 56 barberry 56 spp 56 mosquito populations 56 water hyacinth 56 giant hogweed 56 alga 56 eel grass 56 nematodes 56 species 56 chickweed 56 weevils 56 anthracnose 56 leafy spurge 56 herbaceous plants 56 Invasive species 55 tamarisk 55 grasses 55 woody plants 55 pests 55 downy mildew 55 hyacinth 55 nematode 55 mosquito larvae 55 Sudden Oak 55 insect 55 noxious weeds 55 biocontrol 55 grassland birds 55 zebra mussels 55 willows 54 spider mites 54 woody debris 54 garlic mustard 54 insect pests 54 brookies 54 mussels 54 insect pest 54 freshwater mussels 54 gypsy moth 54 Poison ivy 54 fireweed 54 rotenone 54 nonnative species 54 gypsy moths 54 conifers 54 rock snot 54 insects 54 aquatic insects 54 didymo 54 Zebra mussels 54 insect infestations 54 noxious weed 53 zebra mussel 53 gizzard shad 53 oak wilt 53 Aphids 53 ragwort 53 fungus 53 mountain pine beetles 53 tall fescue 53 aphid 53 nutrient runoff 53 aquatic ecosystem 53 bracken 53 understory 53 groundcover 53 seagrasses 53 lakes 53 toxic algae 53 hardwood trees