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8alix Acer acres American elm American Museum annual weeds Aronia aspen berry Betula black locust blanket spraying Boston Herald Boston Herald Traveler brush control canadensis central hardwoods Centre County chemical cooperation County Crataegus D-T sprays destroyed by indiscriminate esters Experimental Forest feet wide ferns fire hazard flammable foliage spraying forbs Forest Experiment Station grasses grasslands gray birch Herald Traveler Corporation herbaceous herbicides herbicides for brush Hitchiti indiscriminate spraying invading relay involved kill kill-to-ground loblolly maple Middlesex County nonforest of-way Photograph by Boston physiognomic plant communities Power predominant problem Prunus Quercus reinvasion relatively relay floristics respraying resprouting rights-of-way rights-of-way and roadsides root-kill roots Rubus seasons selective basal spray selective spraying shortleaf pine shrubland soil Solidago Southeastern Forest Experiment sprouts Taxodium tion treatment tree seedlings tulip-trees U. S. Southeastern Forest vegetation development vegetation management vegetation types Viburnum Viburnum lentago virginiana WHDH white ash white-pine willow woody plants