Vol. 51—1997 - NorthEastern Weed Science Society

105
INVASIVE NON-INDIGENOUS SPECIES AND
THE ROLE OF THE NURSERY INDUSTRY
B. Blossey'
ABSTRACT
The invasi n of non-indigenous plants is a major threat to the
integrity 0 the worlds ecosystems. Thousands of non-indigenous
plant spec es are known to persist outside cultivation in North
America. Their cumulative impact on natural and agricultural
resources .s estimated to cause billions of dollars in economic losses.
Of the 30 most serious plant invaders 50% were introduced for
ornamenta and horticultural purposes. Even after plants have been
identified s invasive many are continually sold or promoted for
landscapin purposes. An increased awareness of the problem
created b introducing non-indigenous species is essential to prevent
further ec logical disasters. The cooperation of nursery industry and
natural ar as managers is essential to develop procedures allowing
the sale harmless ornamentals and to establish safeguards
preventing the entry or spread of new invasive species.
Director, iological Control of Non-Indigenous Plant Species Program,
Departmen of Natural Resources, Fernow Hall, Cornell University,
Ithaca, N 14853.