Related by context. Frequent words. (Click for all words.) 65 spotted knapweed 63 knapweed 61 Scotch broom 61 knotweed 61 purple loosestrife 61 whiteflies 60 Japanese knotweed 60 leafy spurge 60 hemlock woolly adelgid 59 Gypsy moths 58 loosestrife 58 Hydrilla 58 Feral hogs 58 Aphids 57 Invasive species 57 whitefly 57 mealybugs 57 spider mites 57 salt cedar 57 chickweed 57 invasive weed 56 fireweed 56 woody plants 56 barberry 56 nonnative plants 56 European corn borer 56 tamarisk 56 lodgepole 55 invasive weeds 55 psyllid 55 Infestations 55 pampas grass 55 bollworm 55 boll weevils 55 invasives 55 cutworms 55 insect pest 55 viburnum 55 mealy bug 55 buckthorn 55 infestations 54 forbs 54 spp 54 ragwort 54 pests 54 giant hogweed 54 Poison ivy 54 noxious weeds 54 shrubby 54 invasive pest 53 adelgid 53 buffelgrass 53 spurge 53 pigweed 53 noxious weed 53 water hyacinth 53 phragmites 53 invasive species 53 psyllids 53 insect pests 53 garlic mustard 53 Phytophthora 53 Nematodes 53 corn borer 53 anthracnose 53 soybean aphid 53 weevil 52 beetles 52 Nutria 52 Eurasian milfoil 52 aphids 52 chinch bugs 52 beetle 52 aquatic weeds 52 corn rootworm 52 caterpillars 52 vetch 52 powdery mildew 52 Argentine ants 52 weeds 52 jack pine 52 thistle 52 invasive pests 52 hemlock trees 52 downy mildew 52 hydrilla 51 chytrid fungus 51 junipers 51 hackberry 51 insect 51 duckweed 51 bindweed 51 evergreen shrub 51 insects 51 fungus 51 insect infestations 51 rootworm 51 conifer 51 cheatgrass 51 milkweed 51 thistles