Related by context. Frequent words. (Click for all words.) 58 chestnut trees 55 resistant varieties 55 tomato varieties 54 pest resistant 53 cultivars 52 rootstocks 52 heirloom varieties 51 soybean varieties 50 Miscanthus 50 varieties 48 insect resistant 48 poplar trees 48 cultivar 48 triticale 48 germplasm 47 apple varieties 47 transgenic crops 47 herbicide tolerance 46 transgenic plants 46 transgenic 46 salt tolerant 46 rootstock 46 brassicas 46 hybridizing 45 genetically modified 45 miscanthus 45 wheats 45 Transgenic 44 poplars 44 longleaf pine 44 drought resistant 44 tall fescue 44 ArborGen 44 potato varieties 43 drought tolerant 43 genetically modify 43 plantings 43 genetically engineered 43 switchgrass 42 woody plants 42 japonica 42 crabapple 42 ryegrass 42 pawpaw 42 nematode 42 genetically modified rice 42 seedlings 42 Artemisia 41 prairie grasses 41 genetically altered 41 poplar 41 Scotch pine 41 broadleaf 41 legume 40 perennial grasses 40 Switchgrass 40 cowpea 40 seedling 40 viburnum 40 Syngenta 40 oilseed rape 40 forbs 40 red clover 40 oilseed crops 39 seedless 39 genetically modified GM 39 hybrids 39 aphid 39 redbud 39 pigweed 39 clematis 39 shrubby 39 fruited 39 redbuds 39 coneflowers 39 sweet sorghum 39 Roundup Ready alfalfa 39 genetically modified corn 39 genetically manipulated 39 dogwood 39 crabapples 39 stripe rust 39 whiteflies 38 conifers 38 sugar beets 38 salt cedar 38 pathogen 38 Genetically engineered 38 soybean aphids 38 genetically modifying 38 replanted 38 aphids 38 herbaceous plants 38 rotational grazing 38 petunia 38 camelina 38 daylilies 38 hellebores 38 legumes 38 Experiment Station 38 Genetically modified