Related by context. Frequent words. (Click for all words.) 68 invasive weed 67 invasive weeds 65 tamarisk 65 purple loosestrife 64 noxious weeds 62 invasives 62 noxious weed 61 buckthorn 61 garlic mustard 61 cheatgrass 60 gypsy moths 60 invasive species 59 bark beetle 59 phragmites 59 gypsy moth 57 pine beetles 57 fungus 57 woody plants 57 nematodes 56 beetle 56 beetles 56 nematode 56 weevil 55 lodgepole pine 55 ash borer 55 spider mites 55 beetle infestation 55 insect pests 55 milfoil 55 aphid 54 pests 54 aphids 54 weevils 53 stem rust 53 insect 53 hydrilla 53 feral pigs 53 Emerald Ash Borer 53 pine beetle 53 aspen 53 bark beetles 53 fungi 53 powdery mildew 52 weeds 52 Invasive species 52 junipers 52 herbicides 52 fungal disease 52 understory 51 zebra mussel 51 cottonwoods 51 emerald ash borer 51 borers 51 insect infestations 51 cattails 51 aquatic invasive species 51 thistles 50 insects 50 weed seeds 50 lupine 50 milkweed 50 hardwood trees 50 conifers 50 borer 50 grasshoppers 50 nonnative species 50 beneficial insects 50 resistant varieties 50 species 49 stink bug 49 thistle 49 ash trees 49 root rot 49 fungal diseases 49 grasses 49 zebra mussels 49 Zebra mussels 49 alga 49 lichen 49 herbicide 49 pathogen 49 Africanized bees 49 thrips 49 prairie grass 49 hemlocks 49 wasps 48 Herbicide 48 conifer 48 infestations 48 aspens 48 pest 48 walnut trees 48 feral hogs 48 kudzu 48 bee colonies 48 boreal forests 48 sagebrush 48 juniper 48 grasslands 48 prairie chickens 48 poplars