Related by context. Frequent words. (Click for all words.) 74 Japanese knotweed 70 knotweed 63 invasive weed 61 purple loosestrife 60 bracken 59 insect pest 58 noxious weed 57 invasive weeds 56 phragmites 55 invasive species 55 water hyacinth 55 invasives 55 weevils 55 invasive alien 55 garlic mustard 55 insect 54 heathland 54 conifers 54 conifer 54 fungi 54 Fungus 54 beetle 54 woody plants 54 buckthorn 54 Invasive species 54 privet 54 pests 54 aphid 54 salt cedar 54 horse chestnut 53 gray squirrels 53 sedge 53 ancient woodland 53 knapweed 53 pest 53 gypsy moths 53 varroa mite 53 noxious weeds 53 fungus 52 insect pests 52 voles 52 woodland 52 gypsy moth 52 ladybirds 52 weevil 52 woodlands 52 beetles 52 nematode 52 spider mites 52 rhododendron 52 Aphids 52 stink bug 51 varroa 51 shrub 51 oilseed rape 51 shrubby 51 aphids 51 tamarisk 51 Pests 51 powdery mildew 51 spp 51 Canker 51 hawthorn 51 bluebells 51 milfoil 50 infestations 50 beech trees 50 hedgerows 50 gray squirrel 50 thistles 50 reed beds 50 Herbicides 50 fern 50 infestation 50 bee populations 50 fungal disease 50 invasive aquatic 49 Asian longhorned beetle 49 root rot 49 species 49 dandelion 49 weeds 49 vole 49 dieback 49 Invasive 49 beetle infestation 49 hydrilla 49 carpenter ants 49 fungal 49 Emerald Ash Borer 49 ryegrass 49 pigweed 49 borers 49 midge 49 nematodes 49 feral pigs 49 crabgrass 49 dandelions 48 beech tree 48 tall fescue 48 ornamentals