Related by context. Frequent words. (Click for all words.) 61 invasive alien 58 invasive pest 58 varroa mite 57 invasive species 57 spotted knapweed 57 whitefly 56 species 55 Phytophthora 55 invasive pests 55 bee populations 55 insect pests 55 invasive weed 54 hemlock woolly adelgid 54 insect populations 54 Japanese knotweed 54 fungal disease 53 pests 53 whiteflies 53 European grapevine moth 53 giant salvinia 53 adelgids 53 amphibian species 53 Infestations 53 Invasive species 53 locust swarms 53 bollworm 53 amphibian populations 53 weevil 53 beetle infestation 52 Soybean rust 52 knapweed 52 Sudden Oak 52 biocontrol 52 nonnative plants 52 chytrid fungus 52 Gypsy moths 52 Scotch broom 52 varroa 51 insect pest 51 gypsy moths 51 fireweed 51 insect infestations 51 invasives 51 fungus 51 Cane toads 51 mealybugs 51 buffelgrass 51 phylloxera 51 adelgid 51 nonnative species 51 biodiversity 50 schistosomiasis 50 insect borne diseases 50 seagrasses 50 gypsy moth caterpillars 50 LBAM 50 weevils 50 citrus greening 50 Genetically modified crops 50 freshwater ecosystems 50 saltcedar 50 bird species 50 species extinctions 50 water hyacinth 50 pest infestations 50 invasive weeds 50 fireblight 50 mealy bug 50 grassland birds 50 locust plague 50 giant hogweed 50 knotweed 50 rinderpest 50 pollinating insects 50 loosestrife 49 mammal species 49 forbs 49 psyllid 49 ragwort 49 psyllids 49 corn borer 49 infestations 49 Hydrilla 49 downy mildew 49 beetle 49 biodiversity hotspots 49 grassland habitat 49 Argentine ants 49 noxious weed 49 transgenic crops 49 GMO seeds 49 orchid species 49 marine turtles 49 potato blight 49 Africanized honeybees 49 Didymo 48 gypsy moth 48 stem rust 48 Emerald Ash Borer 48 Colony Collapse Disorder 48 HPAI