Related by context. Frequent words. (Click for all words.) 59 elms 58 Dutch elm disease 57 insect pest 57 gypsy moth 56 bark beetle 56 beetle infestation 56 fungal disease 56 chestnut trees 54 beetle 54 mountain pine beetles 54 hemlock trees 54 Asian longhorned beetle 54 insect pests 54 varroa mite 54 hemlocks 54 overhunting 53 elm trees 53 fungus 53 defoliated 53 chytrid fungus 53 stink bug 53 gypsy moths 53 bee populations 53 beetles 53 pine beetles 52 walnut trees 52 ash trees 52 elm 52 Soybean rust 52 defoliate 52 Irish potato famine 51 megafauna 51 boll weevil 51 bark beetles 51 stem rust 51 insect infestation 51 species 51 aphid 51 lodgepole pine 50 emerald ash borer 50 honeybee colonies 50 ash borer 50 defoliation 50 stink bugs 50 temperate regions 50 whitefly 50 insect 50 bee colonies 49 lodgepole pines 49 viburnum 49 pine beetle 49 knapweed 49 dieback 49 purple loosestrife 49 junipers 49 nematode 48 gray squirrels 48 mountain pine beetle 48 knotweed 48 invasive pest 48 woody plants 48 insect infestations 48 hardwood forests 48 conifer 48 bark beetle infestation 48 borers 48 root rot 48 cheatgrass 48 Spanish flu pandemic 48 dogwood 48 Emerald Ash Borer 48 beech trees 48 chestnut tree 47 arthropod 47 hardwood trees 47 lady beetles 47 temperate zones 47 extirpated 47 invasives 47 infestation 47 Invasive species 47 virulent strains 47 weevil 47 conifers 47 Fusarium 47 aphids 47 infestations 46 influenza pandemics 46 monocultures 46 nematodes 46 milder winters 46 Colony Collapse Disorder 46 Japanese knotweed 46 fungi 46 prion disease 46 citrus greening 46 small pox 46 aspen trees 46 invasive species 46 entomologists 46 pathogen