Related by context. Frequent words. (Click for all words.) 62 invasive species 62 mealybugs 59 whitefly 59 invasive pest 58 loosestrife 58 knotweed 58 invasive weeds 58 invasive weed 58 hemlock woolly adelgid 57 Phytophthora 57 invasives 57 adelgid 56 spotted knapweed 56 phragmites 56 pests 56 fireweed 56 psyllid 56 chytrid fungus 56 varroa mite 55 Hydrilla 55 weevil 55 Canker 55 Japanese knotweed 55 Didymo 55 feral pigs 55 gypsy moths 55 gypsy moth caterpillars 55 whiteflies 54 purple loosestrife 54 insect pests 54 pampas grass 54 infestation 54 Argentine ants 54 Aphids 54 Invasive species 54 glassy winged sharpshooter 54 infestations 54 hemlock trees 54 insect pest 54 tamarisk 53 tiger mosquito 53 root rot 53 fungus 53 anthracnose 53 fungal disease 53 Infestations 53 oak wilt 53 Sudden Oak 53 Eurasian milfoil 53 beetle 52 varroa 52 pest 52 dieback 52 weevils 52 biocontrol 52 mangrove 52 downy mildew 52 amphibian populations 52 vegetation 52 vetch 52 spp 52 beetles 52 ragwort 51 oleanders 51 fungal diseases 51 giant hogweed 51 seagrasses 51 species 51 powdery mildew 51 citrus greening 51 eelgrass 51 leafy spurge 51 noxious weed 50 aquatic weeds 50 insects 50 water hyacinth 50 psyllids 50 Cane toads 50 aphid 50 disease 50 schistosomiasis 50 shrub 50 Asian longhorned beetle 50 mosquito larvae 50 invasive alien 50 sucking insects 50 mosquito breeding grounds 50 alga 50 salt cedar 50 invasive pests 50 spider mites 50 parasitic wasps 50 insect 50 Soybean rust 50 bark beetle 49 woody plants 49 buckthorn 49 tsetse fly 49 stripe rust 49 barberry 49 Lionfish