Related by context. Frequent words. (Click for all words.) 64 invasive species 59 Japanese knotweed 58 invasives 57 noxious weeds 57 invasive weeds 57 water hyacinth 56 invasive weed 55 noxious weed 53 purple loosestrife 53 pests 53 insect pests 53 phragmites 51 Invasive Species 51 Emerald Ash Borer 50 Invasive species 50 biodiversity 49 fynbos 48 buckthorn 48 species 48 aquatic invasive species 48 feral pigs 47 tamarisk 47 pest 47 insect infestations 46 nonnative species 46 Biodiversity 46 vegetation 46 vector borne diseases 46 Pests 46 soil erosion 45 desertification 45 salt cedar 45 beetle infestation 45 bio diversity 45 privet 44 Desertification 44 Protected Areas 44 garlic mustard 44 gypsy moths 44 aquatic species 44 gypsy moth 44 feral animals 44 rhino poaching 43 citrus greening 43 fauna 43 medicinal plants 43 ornamental plants 43 fungal disease 43 dieback 43 weeds 43 emerald ash borer 43 biodiversity conservation 43 carbon sinks 42 flora 42 shrubs 42 Mangroves 42 endangered species 42 bark beetle 42 climate change 42 RSPB Scotland 42 amphibian species 42 canker 42 conifer 42 Vegetation 42 HIV Aids 42 woody plants 42 HIV AIDS pandemic 42 ash borer 42 wetland 42 insect populations 42 Avian Influenza 41 overgrazing 41 Deforestation 41 waterbirds 41 hydrilla 41 cheatgrass 41 revegetation 41 Invasive 41 habitats 41 woody debris 41 infestations 41 pine beetle 41 pine beetles 41 infestation 41 bird species 41 spider mites 41 blight 41 aquatic vegetation 41 scourge 40 Bovine TB 40 beetle 40 HPAI 40 aquatic ecosystems 40 marine turtles 40 weevils 40 lantana 40 agro forestry 40 birdlife 40 beneficial insects 40 schistosomiasis 40 deforestation