Related by context. Frequent words. (Click for all words.) 54 invasive species 53 nonnative species 49 invasives 49 purple loosestrife 48 invasive weed 48 salt cedar 47 phragmites 47 invasive weeds 46 feral pigs 45 species 44 tamarisk 43 Invasive species 43 invasive 42 aquatic vegetation 42 Japanese knotweed 42 buckthorn 41 grass carp 41 milfoil 41 cheatgrass 41 Zebra mussels 41 Native 41 Invasive 41 zebra mussels 40 grasses 40 conifers 40 quagga mussels 40 hydrilla 40 noxious weed 39 eelgrass 39 beetles 39 zebra mussel 39 feral animals 39 pests 39 garlic mustard 39 understory 39 vegetation 38 weevil 38 shrubs 38 water hyacinth 38 beetle 38 mute swans 38 barred owls 38 insects 38 feral hogs 38 noxious weeds 38 weevils 38 woody plants 38 Africanized bees 38 junipers 38 gypsy moths 38 insect 38 native 38 indigenous 38 lionfish 38 bark beetle 38 ferns 38 prairie dogs 37 bullfrog 37 hemlocks 37 cattails 37 nesting birds 37 habitat 37 nematode 37 nematodes 37 lampreys 37 fungal disease 37 snails 37 beneficial insects 37 Invasive Species 37 endangered species 37 stink bug 37 beavers 37 weeds 37 natives 37 bark beetles 37 groundcover 36 Native American 36 Native Americans 36 salt marsh 36 gypsy moth 36 barred owl 36 fungus 36 lake sturgeon 36 gray squirrels 36 marsh 36 aquatic invasive species 35 pest 35 native Hawaiians 35 gray squirrel 35 alewives 35 Natives 35 silver carp 35 rotenone 35 privet 35 cane toad 35 invader 35 pine beetles 35 cormorants 35 snakehead 35 psyllid 35 infestation