Related by context. Frequent words. (Click for all words.) 57 aerial spraying 55 herbicides 55 Aerial spraying 53 Controlled burns 53 spraying pesticides 52 defoliate 52 pesticide spraying 51 spraying 51 Herbicides 51 herbicide 50 Scotch broom 50 defoliation 49 hardwood trees 49 clearcutting 48 weeds 48 leafy spurge 47 felling trees 47 herbicides pesticides 47 defoliated 47 Japanese knotweed 47 vegetation 47 timber harvesting 47 salt cedar 47 invasive weed 47 buffelgrass 47 Fertilizing 47 timbering 47 biocontrol 46 thistles 46 pine plantations 46 invasive weeds 46 herbicide resistant 46 clearcuts 46 contaminating groundwater 46 irrigating 46 gypsy moth caterpillars 46 Rotenone 46 rodenticides 45 spotted knapweed 45 reforesting 45 noxious weeds 45 fireweed 45 tamarisk 45 replanting 45 fumigating 45 forests 45 Bti 45 Spraying 45 noxious weed 45 Replanting 45 soil erosion 45 fertilizing 45 soil compaction 45 purple loosestrife 45 pesticides 45 Weed Control 45 chemical sprays 45 whiteflies 44 hardwood forests 44 crop dusters 44 defoliants 44 feral pigs 44 Eurasian milfoil 44 Prescribed burns 44 planting 44 spurge 44 lodgepole 44 forested 44 crop residue 44 Gypsy moths 44 bindweed 44 overgrazing 44 replant trees 44 invasives 44 synthetic pesticides 44 virgin forests 44 trees 44 revegetation 43 hemlock trees 43 mulching 43 boll weevils 43 larviciding 43 timber harvest 43 insect infestations 43 tilling 43 cutworms 43 chemical fertilizers 43 knapweed 43 softwoods 43 pampas grass 43 mowing 43 toxic pesticides 43 aquatic weeds 43 timber harvests 43 ryegrass 43 Phytophthora 43 Herbicide 43 gypsy moths 43 forest thinning 42 insecticide 42 berry bushes