Related by context. Frequent words. (Click for all words.) 65 mountain pine beetles 63 pine beetles 62 lodgepole pine 61 bark beetle 61 beetle infestation 60 bark beetles 58 lodgepole pines 57 defoliate 57 beetle 57 beetles 56 sequoias 56 hemlock trees 56 Sudden Oak 55 adelgid 55 aspen 55 fungal disease 55 caterpillars 55 mountain pine beetle 55 anthracnose 55 insect infestations 54 temperate regions 54 aspen trees 54 pine beetle 54 bark beetle infestation 54 spruce trees 54 conifers 54 fungus 53 defoliated 53 dieback 53 insect pests 53 warmer winters 53 junipers 53 pine trees 53 milder winters 53 defoliation 53 gypsy moth 53 knapweed 52 insects 52 hemlocks 52 grasses 52 armyworms 52 spider mites 52 hemlock woolly adelgid 52 woody plants 52 Aphids 52 cheatgrass 52 insect infestation 52 gypsy moths 52 deciduous trees 51 chytrid fungus 51 insect 51 whitefly 51 vegetation 51 whiteflies 51 forbs 51 stripe rust 51 overwintering 51 aspens 51 grasshoppers 51 birches 51 conifer 50 winterkill 50 carpenter ants 50 tropical climates 50 Migratory birds 50 temperate zones 50 birch trees 50 invasive weed 50 aphid 50 elms 50 chiggers 50 ponderosa pines 50 leafy spurge 50 squirrels 50 whitebark pine 50 leafless 50 purple loosestrife 50 frosts 50 forest fires 50 lichen 50 root rot 50 overwinter 50 Mountain Pine Beetle 49 crabapples 49 infestation 49 trees 49 birds 49 species 49 fungal spores 49 pests 49 understory 49 hardwood trees 49 herbaceous plants 49 marmots 49 insect populations 49 maples 49 Poison ivy 49 boreal forests 49 cottonwoods 49 hibernating bats 49 beech trees