Related by context. Frequent words. (Click for all words.) 67 tamarisk 64 salt cedar 61 knapweed 60 invasive weed 60 noxious weed 58 bark beetle 57 knotweed 56 noxious weeds 56 cheatgrass 56 invasive weeds 55 insect pest 54 insect pests 54 woody plants 54 invasive species 54 invasives 54 buckthorn 54 nematode 53 weevil 53 insect 52 purple loosestrife 52 garlic mustard 51 phragmites 51 aphid 51 pest 51 mountain pine beetles 50 Japanese knotweed 50 pests 50 weevils 50 vegetation 50 aphids 50 bark beetles 50 weeds 50 spider mites 50 nonnative species 50 insect infestations 50 fungal disease 49 understory 49 Vegetation 49 beetle 49 beetle infestation 49 pine beetles 49 pigweed 49 Herbicides 48 conifers 48 species 48 gypsy moths 48 cottonwoods 48 psyllid 48 beneficial insects 48 feral pigs 48 armyworms 48 beetles 48 gypsy moth 47 insects 47 nematodes 47 powdery mildew 47 hardwood forests 47 cottonwood 47 pine beetle 47 insect infestation 47 borers 47 black footed ferrets 47 Invasive species 47 herbicides 47 Aphids 47 zebra mussels 47 rotenone 47 lodgepole pine 47 aspen 47 rangeland 47 junipers 46 sagebrush 46 Soybean rust 46 milfoil 46 grasses 46 hardwood trees 46 lady beetles 46 Emerald Ash Borer 46 prairie grasses 46 ant species 46 lodgepole pines 46 hydrilla 46 herbicide 46 conifer 46 zebra mussel 45 grasshoppers 45 thrips 45 bark beetle infestation 45 aspen trees 45 invasive alien 45 shrub 45 mountain pine beetle 45 thistle 45 nonnative 45 Invasive Species 45 Asian longhorned beetle 45 borer 45 stink bug 45 sedge 44 Zebra mussels 44 boreal forests