Related by context. Frequent words. (Click for all words.) 71 giant salvinia 70 Hydrilla 65 water hyacinth 63 aquatic weeds 63 hydrilla 61 aquatic weed 60 invasive weed 60 aquatic vegetation 59 Eurasian milfoil 58 loosestrife 57 invasive species 57 Scotch broom 57 Japanese knotweed 57 purple loosestrife 57 Invasive species 56 phragmites 56 invasive pest 56 Didymo 56 hemlock woolly adelgid 55 salt cedar 55 grass carp 55 Eurasian watermilfoil 55 fireweed 55 insect pest 55 duckweed 54 invasives 54 knotweed 54 weevils 54 invasive aquatic 54 rock snot 54 spotted knapweed 54 Feral hogs 54 freshwater mussels 54 mealybugs 54 zebra mussel 53 freshwater shrimp 53 Gypsy moths 53 marsh grasses 53 milfoil 53 whitefly 53 Lionfish 53 tamarisk 53 hyacinth 53 cattail 53 alga 52 round goby 52 zebra mussels 52 saltcedar 52 invasive weeds 52 Nutria 52 marsh 52 species 52 garlic mustard 52 adelgids 51 insect 51 Rotenone 51 snails 51 weevil 51 adelgid 51 knapweed 51 giant hogweed 51 Phytophthora 51 buckthorn 50 aquatic ecosystem 50 insects 50 insect pests 50 aquatic habitats 50 eelgrass 50 Poison ivy 50 Zebra mussels 50 Soybean rust 50 tiger mosquito 50 cattails 50 gypsy moths 50 algae 50 leafy spurge 50 ragwort 50 spider mites 49 lionfish 49 whiteflies 49 woody plants 49 gypsy moth 49 mosquito larvae 49 microscopic algae 49 beetle 49 alligator gar 49 vegetation 49 bromeliad 49 Nile perch 49 sea squirt 49 chytrid fungus 49 hyacinths 49 noxious weed 49 defoliate 49 weeds 49 nonnative plants 49 nutria 49 soybean aphid 49 sedge 49 buffelgrass 49 gizzard shad