Related by context. Frequent words. (Click for all words.) 63 mountain pine beetles 62 pine beetles 61 pine beetle 61 bark beetle 60 mountain pine beetle 59 beetle infestation 56 bark beetles 55 Asian longhorned beetle 55 beetle 54 emerald ash borer 54 lodgepole pine 54 hemlock trees 53 purple loosestrife 53 gypsy moth 53 invasive species 52 giant hogweed 52 nutria 52 invasives 52 Emerald Ash Borer 52 leafy spurge 52 hemlocks 51 ash borer 51 aspen 51 Dutch elm disease 51 invasive weed 51 bark beetle infestation 51 feral pigs 51 insect infestations 50 lodgepole pines 50 Japanese knotweed 50 Invasive species 50 gray squirrel 50 noxious weed 50 species 50 insect 50 insect pests 50 beetles 50 boreal forests 50 gypsy moths 50 infestation 50 knotweed 49 ash trees 49 cheatgrass 48 invasive weeds 48 tamarisk 48 salt cedar 48 insect pest 48 cormorant 48 insects 48 noxious weeds 48 forest fires 48 black footed ferrets 47 pests 47 insect infestation 47 beetle larvae 47 forbs 47 salmonids 47 phragmites 47 gray squirrels 47 fungus 47 feral animals 47 caterpillars 47 catastrophic wildfires 46 hibernating bats 46 knapweed 46 warmer winters 46 carpenter ants 46 moose 46 grizzly bears 46 prolonged drought 46 bee populations 46 woodland caribou 46 burrowing owl 46 deer herd 46 deer herds 46 invasive pest 46 invasive alien 46 chytrid fungus 46 forest ecosystems 46 sea lamprey 46 soybean aphids 46 blowdown 46 stink bug 46 barred owl 45 feral hogs 45 marmot 45 grasshoppers 45 elk 45 aspen trees 45 species extinctions 45 vole 45 honeybee colonies 45 whitebark pine 45 arthropod 45 nonnative species 45 boll weevil 45 muskrats 45 infestations 45 locust plague 45 grasshopper 45 cormorants